Practical Guide to AIXABOUT FS - LVM GENERAL HACMP - POWERHA HMC - ISD NETWORK NIM PERFORMANCE STORAGE UPDATE - INSTALL VIO LVM (Logical Volume Manager): LVM manages the storage to have a structured overview of it. /var/adm/ras/lvmcfg.log lvm log file shows what lvm commands were used (alog -ot lvmcfg) alog -ot lvmt shows lvm commands and libs The LVM consists of: -high level commands: can be used by users, e.g.: mklv (this can call an intermediate level command) -intermediate level commands: these are used by high-level commands, e.g. lcreatelv (users should not use these) -LVM subroutine interface library: it contains routines used by commands, e.g. lvm_createlv -Logical Volume Device Driver (LVDD): manages and processes all I/O; it is called by jfs or lvm library routines -Disk Device Driver: It is called by LVDD -Adapter Device Driver: it provides an interface to the physical disk This shows how the execution of a high level command goes through the different layers of LVM: LOGICAL VOLUME After you create a volume group, you can create logical volumes within that volume group. Logical partitions and logical volumes make up the logical view. Logical partitions map to and are identical in size to the physical partitions. A physical partition is the smallest unit of allocation of disk where the data is actually stored. A logical volume is a group of one or more logical partitions that can span multiple physical volumes. All the physical volumes it spans must be in the same volume group. A logical volume consists of a sequence of one or more logical partititons. Each logical partition has at least one and a maximum of three corresponding physical partitions that can be located on different physical volumes. When you first define a logical volume, the characteristics of its state (LV STATE) will be closed. It will become open when, for example, a file system has been created in the logical volume and mounted. It is also possible that you might want to create a logical volume and put nothing on it. This is known as a raw logical volume. Databases frequently use raw devices Logical Volume types: - log logical volume: used by jfs/jfs2 - dump logical volume: used by system dump, to copy selected areas of kernel data when a unexpected syszem halt occurs - boot logical volume: contains the initial information required to start the system - paging logical volume: used by the virtual memory manager to swap out pages of memory users and appl.-s will use these lvs: - raw logical volumes: these will be controlled by the appl. (it will nit use jfs/jfs2) - journaled filesystems: Striped logical volumes: Striping is a technique spreading the data in a logical volume across several physical volumes in such a way that the I/O capacity of the physical volumes can be used in parallel to access the data. LVCB (Logical Volume Control Block) First 512 byte of each logical volume in normal VGs (In big VGs it moved partially into the VGDA, and for scalable VGs completely.) (traditionally it was the fs boot block) The LVCB stores the attributes of the LV. Jfs does not access this area. # getlvcb -AT <lvname> <--shows the LVCB of the lv -------------------- LOGICAL VOLUME: hd2 VOLUME GROUP: rootvg LV IDENTIFIER: 0051f2ba00004c00000000f91d51e08b.5 PERMISSION: read/write VG STATE: active/complete LV STATE: opened/syncd TYPE: jfs WRITE VERIFY: off MAX LPs: 512 PP SIZE: 32 megabyte(s) COPIES: 2 SCHED POLICY: parallel LPs: 73 PPs: 146 STALE PPs: 0 BB POLICY: relocatable INTER-POLICY: minimum RELOCATABLE: yes INTRA-POLICY: center UPPER BOUND: 32 MOUNT POINT: /usr LABEL: /usr MIRROR WRITE CONSISTENCY: on/ACTIVE EACH LP COPY ON A SEPARATE PV ?: yes Serialize IO ?: NO SEARCH ON THIS BLOG: 1,814,733 PAGEVIEWS ABOUT FS LV Mirror Pool PV VG FS - LVM AIX History Backup Commands CPU - Processes Crontab - At Date - Time Devices Dump - Core Errpt - Diag - Alog - Syslogd Firmware IO - AIO, DIO, CIO Memory - Pag.Space ODM Printing SRC Startup - Shutdown System - Kernel Tunables User - Group User Login GENERAL Appl. Monitor Basics Build - Configure Clverify Commands - Cases Config too long DARE - Snapshot Disk Heartbeat Storage - VG, NFS HACMP - POWERHA ASMI HMC Basics - Console HMC CLI HMC/P7 Install ISD Basics RMC HMC - ISD Basics - Devices, Routing Basics - Protocol, Subnet Basics - Vlan Commands Eth. Chan. Ethernet Adapter IVE - HEA Netcd NFS RSH - RCP Sendmail NETWORK AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 1 of 8 5/23/2014 11:02 AM inter-policy inter-physical volume allocation policy, can be minimum or maximum minimum: to allocate pp's the minimum pv will be used (not spreading to all pv's tha data if possible) maximum: to spread the physical partitions of this logical volume over as many physical volumes as possible. This illustration shows 2 physical volumes. One contains partition 1 and a copy of partition 2. The other contains partition 2 with a copy of partition 1. The formula for allocation is Maximum Inter-Disk Policy (Range=maximum) with a Single Logical Volume Copy per Disk (Strict=y). each lp copy on separate pv The strictness value. Current state of allocation, strict, nonstrict, or superstrict. A strict allocation states that no copies for a logical partition are allocated on the same physical volume. If the allocation does not follow the strict criteria, it is called nonstrict. A nonstrict allocation states that copies of a logical partition can share the same physical volume. A superstrict allocation states that no partition from one mirror copy may reside the same disk as another mirror copy. (mirror 2 and mirror 3 cannot be on the sam edisk) (So inter-policy and strictness have effect together how many disks are used: spreading to maximum disks (1st lps) then mirroring them we need another bunch of disks; however spreading to minimum disks and mirroring, we need less disks.) intra-policy intra-physical volume allocation policy, it specifies what startegy should be used for choosing pp's on a pv. it can be: edge (outer edge), middle (outer middle), center, inner middle, inner edge If you specify a region, but it gets full, further partitions are allocated from near as possible to far away. The more i/o-s used, the pp's should be allocate to the outer edge. mirror write consistency If turned on LVM keeps additional information to allow recovery of inconsistent mirrors. Mirror write consistency recovery should be performed for most mirrored logical volumes MWC is necessary to mirror lvs with parallel scheduling policies. sched policy how reads and writes are handled to mirrorred logical volumes parallel (default): read from least busy disk, write to all copies concurrently (at the same time) sequential: read from primary copy only (if not available then next copy). write sequential (one after another) (1 book suggests sequential because it works with MWC) Write verify If turned on, all writes will be verified with a follow-up read. This will negatively impact performace but useful. BB policy Bad block relocation policy. (bad blocks are relocatable or not) Relocatable Indicates whether the partitions can be relocated if a reorganization of partition allocation takes place. Upper Bound what is the maximum number of physical volumes a logical volume can use for allocation ------------------ # lslv -l pdwhdatlv PV COPIES IN BAND DISTRIBUTION hdiskpower5 125:000:000 3% 000:004:000:076:045 Copies shows information of each copies (separated by :) on the disks (125 first copy and no other mirrors are on the disk) In Band the percentage of pps on the disk which were allocated within the region specified by Intra-physical allocation policy Distribution how many pps are allocated in: outer edge, outer middle, center, inner middle, and inner edge (125=4+76+45) ------------------ lslv lvname displays information about the logical volume lslv -m lvname displays the logical partitions (LP) and their corresponding physical partititons (PP) lslv -l lvname displays on which physical volumes is the lv resides lslv -p <hdisk> displays the logical volume allocation map for the disk (shows used, free, stale for each physical partition) lslv -p <hdisk> <lv> displays the same as above, just the given lv's partitions will be showed by numbers Open Indicates active if LV contains a file system Closed Indicates inactive if LV contains a file system Syncd Indicates that all copies are identical Stale Indicates that copies are not identical mklv -y newlv1 datavg 1 create logical volumes (mklv -y'testlv' -t'jfs' rootvg 100 <--creates jfs with 100 lp) -y newlv1 name of the lv datavg in which vg the lv will reside 1 how many logical partitions add to the lv mklv -t jfs2log -y <lvname> <vgname> 1 <pvname> creates a jfs2log lv (after creation format it: logform -V jfs2 <loglvname>) rmlv removes a logical volume rmlv -f loglv removes without confirmation mklvcopy bblv 2 hdisk2 make a 2nd copy (1LP=2PP) of bblv to hdisk2 (synchronization will be needed: syncvg -p hdisk2 hdisk3) rmlvcopy bblv 1 hdisk3 leave 1 copy (1LP=1PP) only and remove those from hdisk3 SSH - SCP SSH - X11 Telnet - FTP Basics Bootpd - Tftpd Install LPP Source Machines MKSYSB Nimadm SPOT NIM Basics CPU I/O - LVM iostat - fcstat Memory Network svmon - RAM topas - nmon vmstat - CPU/RAM VMM concepts VIO PERFORMANCE Adapter Basics - SAN Basics - Settings EMC Hitachi HP EVA - SSA MPIO SDD STORAGE Basics Commands IFIX UPDATE - INSTALL Basics Commands AME - AMS CDROM - DVDROM LPM NIB - LA NPIV SEA Shared Storage Pool VIOS update/upgrade Virt. Eth. Ad. Virt. Proc.-Ent. Cap. VSCSI VSCSI - Stor. Pool VIO +others alt_disk awk - sed bash citrix java kdb ksh locale multibos perl profiles rbac Rsh samba screen script sudo vi +EXTRAS AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 2 of 8 5/23/2014 11:02 AM getlvcb display the LVCB (Logical Volume Control Block) of a logical volume extendlv increasing the size of a logical volume cplv copying a logical volume chlv changes the characteristic of a logical volume migratelp testlv/1/2 hdisk5/123 migrates testlv's data from the 1st lp's second copy to hdisk5 on pp 123 (output of lspv -M hdiskx can be used:lvname:lpnumber:copy, this sequence is needed) (if it is not mirrorred than easier this way: migratelp testlv/1 hdisk3) (if it is mirrorres and we use the above commande, than 1st copy will be used: testlv/1/1...) migratelp in for cycle: for i in $(lslv -m p1db2lv | grep hdiskpower11 | tail -50 | cut -c 2-4); do migratelp p1db2lv/$i hdiskpower3; done lresynclv resync a logical volume (???maybe if mirrorred??? ------------------ Creating a new log logical volume: 1. mklv -t jfs2log -y lvname vgname 1 pvname <-- creates the log lv 2. logform -V jfs2 /dev/lvname 3. chfs -a log=/dev/lvname /fsname <--changes the log lv (it can be checked in /etc/filesystems) ------------------ Resynchronizing a logical volume: 1. root@aix16: / # lslv hd6 | grep IDENTIFIER LV IDENTIFIER: 00c2a5b400004c0000000128f907d534.2 2. lresynclv -l 00c2a5b400004c0000000128f907d534.2 ------------------ Striped lv extending problems: extending is only possible by the stripe width (if it is 2, the extended lp should be 2,4,6...) if lv can't be extended upper bound can cause this: lslv P02ctmbackuplv | grep UPPER UPPER BOUND: 2 It means that the lv can only be on 2 disks, but if on those 2 disks has no more space it can't be extebded to other disks. upper bound should be changed: chlv -u 4 P02ctmbackuplv After this extension should be possible . ------------------ Unable to find lv in the define configuration database 1. synclvodm <vgname> <-- rebuild the volume group descriptors on the physical volume. Enter: 2. rmlv <lvname> <-- remove the unwanted logical volume. ------------------ Migrating PPs between disks: checking the PPs of test1lv: lslv -m test1lv test1lv:/home/test1fs LP PP1 PV1 PP2 PV2 PP3 PV3 0001 0001 hdisk6 0002 0002 hdisk6 0003 0003 hdisk6 ... 0057 0057 hdisk6 0058 0058 hdisk6 0059 0059 hdisk6 the command: migratelp test1lv/59 hdisk7 (it wil migrate LP #59 to hdisk7) in a for cycle: for i in $(lslv -m shadowlv | grep hdisk1 | tail -10 | cut -c 2-4); do migratelp shadowlv/${i} hdisk0 done ------------------ Once had a problem with an lv and its mirror copies: root@bb_lpar: / # lsvg -l bbvg bbvg: LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT 0516-1147 : Warning - logical volume bblv may be partially mirrored. bblv jfs2 16 20 3 closed/syncd /bb root@bb_lpar: / # mirrorvg bbvg 0516-1509 mklvcopy: VGDA corruption: physical partition info for this LV is invalid. 0516-842 mklvcopy: Unable to make logical partition copies for logical volume. 0516-1199 mirrorvg: Failed to create logical partition copies for logical volume bblv. 0516-1200 mirrorvg: Failed to mirror the volume group. root@bb_lpar: / # lslv -l bblv 0516-1939 : PV identifier not found in VGDA. AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 3 of 8 5/23/2014 11:02 AM Labels: LVM root@bb_lpar: / # rmlvcopy bblv 1 hdisk2 0516-1939 lquerypv: PV identifier not found in VGDA. 0516-304 getlvodm: Unable to find device id 0000000000000000 in the Device Configuration Database. 0516-848 rmlvcopy: Failure on physical volume 0000000000000000, it may be missing or removed. The partial mirrored lps caused a big mess in VGDA and LVM, so the solution was the removal of these lps with a low-level command: lreducelv 1. checking the problematic lps: root@bb_lpar: / # lslv -m bblv bblv:/bb LP PP1 PV1 PP2 PV2 PP3 PV3 0001 0008 hdisk2 0002 0009 hdisk2 0003 0010 hdisk2 0004 0011 hdisk2 0005 0012 hdisk2 0006 0013 hdisk2 0007 0014 hdisk2 0008 0015 hdisk2 0009 0008 hdisk3 0016 hdisk2 0010 0009 hdisk3 0017 hdisk2 0011 0010 hdisk3 0018 hdisk2 0012 0012 hdisk3 0019 hdisk2 0013 0001 hdisk2 0014 0002 hdisk2 0015 0003 hdisk2 0016 0004 hdisk2 2. creating a text file with these wrong lps which will be used by lreducelv: 1st column: PVID of the disk with wrong lps (lspv hdisk2: 00080e82dfab25bc) 2nd column: PP# of the wrong lps (lslv -m bblv: PP2 column) 3rd column: LP# of the wrong lps (lslv -m bblv: LP column) root@bb_lpar: / # vi partial_mir.txt 00080e82dfab25bc 0016 0009 00080e82dfab25bc 0017 0010 00080e82dfab25bc 0018 0011 00080e82dfab25bc 0019 0012 3. removing the partial mirror copies: lreducelv -l <LV ID> -s <NUMBER of LPs> <TEXT FILE> LV ID: 00080e820000d900000001334c11e0de.1 (lslv bblv) NUMBER of LPs: 4 (wc -l partial_mir.txt) TEXT FILE: partial_mir.txt root@bb_lpar: / # lreducelv -l 00080e820000d900000001334c11e0de.1 -s 4 partial_mir.txt Now the lvm deallocates all PP's of your partially mirror. 4. After these, lslv -m will show correct output, but LVCB or VGDA could still show we have 2 copies root@bb_lpar: /tmp/bb # odmget -q name=bblv CuAt | grep -p copies CuAt: name = "bblv" attribute = "copies" value = "2" type = "R" generic = "DU" (We can see this paragraph only if there is mirroring, otherwise there will be no output of odmget command) root@bb_lpar: /tmp/bb # getlvcb -AT bblv AIX LVCB intrapolicy = m copies = 1 (odmget shows we have 2 copies and getlvcb shows we have only 1 copy.) Probably it is safer if we update both with the correct value: putlvodm -c <COPYNUM> <LV ID> putlvcb -c <COPYNUM> <LV NAME> COPYNUM: 1 LV ID: 00080e820000d900000001334c11e0de.1 (lslv bblv) root@bb_lpar: /tmp/bb # putlvodm -c 1 00080e820000d900000001334c11e0de.1 root@bb_lpar: /tmp/bb # putlvcb -c 1 bblv source of this solution: http://archive.rootvg.net/cgi-bin/anyboard.cgi/aix?cmd=get&cG=73337333&zu=37333733&v=2&gV=0&p= ------------------ 36 comments: Anonymous July 20, 2012 at 4:46 PM Very good stuffs AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 4 of 8 5/23/2014 11:02 AM Replies Reply Replies Reply Replies Reply Replies Reply Reply narayana August 7, 2012 at 5:10 PM yep, Very good Stuff Reply aix August 7, 2012 at 10:57 PM thanks :) Anonymous December 28, 2012 at 5:47 PM excellent info...keep up the gud work..... Reply aix December 28, 2012 at 9:20 PM :) naresh January 30, 2013 at 9:46 AM amazing work what u done boss Reply aix January 30, 2013 at 10:43 AM :-) Vasanth Govindaraju February 8, 2013 at 10:46 AM HI.. (AIX 6.1) Rootvg have 2 disks(hdisk0 and hdisk1). current boot is hdisk0. only hd11admin and livedump resides in hdisk1.. can i move it to hdisk0? by " migratepv -l hd11admin hdisk1 hdisk0" and "migratepv -l livedump hdisk1 hdisk0" will it works?? If possible can u plz ex-plain use of both LV's.. Reply Vasanth Govindaraju February 8, 2013 at 10:56 AM Senario is that.. I am supposed to do TL upgrade for AIX 6.1 server.. Rootvg was mirrored with hdisk0 and hdisk1.. current boot is hdisk0.. LV's hd11admin and livedump was not mirrored. I unmirrored rootvg (unmirrorvg rootvg hdisk0 --- success). then trying to reduce rootvg hdisk1 (reducevg rootvg hdisk1).. Warning : hd11admin and livedump will be deleted... (Y/N)... N then later i tried me mirror back... but not happening.. throughing error... so later i done multibos and completed TL upgrade..... But now mirror not happening.. so i want to move hd11admin and livedump to hdisk0.. and reduce hdisk1 /add to rootvg and want to mirror it again..... Also y those two LV's not mirrored before I unmirrored it.... I hope only sysdum in rootvg wont get mirrored????? can u plz explain on this issue.. where i went wrong???? Advance Thanks..!! aix February 10, 2013 at 10:32 PM Hi, I checked 1 AIX server and these LVs (hd11admin and livedump) are mirrored in that server. hd11admin: privileged processes can securely create temporary files there livedump: this is the place where you can create a dump on a live system, without rebooting it. The commands what you sent should work and I don't know why these LVs were not mirrorred earlier. Hope this helps, Balazs Juraj Bocinec February 27, 2013 at 3:00 PM Hello, have you come across an issue when lslv reported only some of the information? If i run it under root i get all the information but other user has some information missing, for example: TYPE: sysdump WRITE VERIFY: ? MAX LPs: ? PP SIZE: ? COPIES: ? SCHED POLICY: ? LPs: ? PPs: ? AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 5 of 8 5/23/2014 11:02 AM Replies Reply Replies STALE PPs: ? BB POLICY: ? INTER-POLICY: minimum RELOCATABLE: yes INTRA-POLICY: middle UPPER BOUND: 32 on other systems this works fine, even on 2nd node of the cluster. May this be some security setting in the AIX? But we didn't change anything in the environment settings. I have also checked LVCB and VGDA and they seem correct. Also ODM must be correct because i wouldn't get this info for root. Reply aix February 27, 2013 at 5:08 PM Hi, strange, I've never seen this before...first ideas: -do you experience this with other lvm commands? (i.e. lsvg) -do you experience this for every lv? (if not do you see some logic?) -do you experience this with smitty as well? I'll think about that. Juraj Bocinec February 28, 2013 at 10:17 AM Hello, with other commands (lsvg, lspv) i get output, it only doesn't work for lslv command and for all LVs, even in different VGs than rootvg. This behaviour is the same with smit. I will try to arrange for reboot and see if it helps, it may as well be a bug in AIX. aix February 28, 2013 at 12:59 PM Hi, 2 things :) 1. This is written in man lslv: "If the lslv command cannot find information for a field in the Device Configuration Database, it will insert a question mark (?) in the value field. ..." So lslv will get info from ODM. If you check "ls -l /etc/objrepos", you could see if other user has read access to those files or not. 2. This is written in man lslv: "The command attempts to obtain as much information as possible from the description area when it is given a logical volume identifier." I'm not sure about that, but it seems that, if lv ideintifier is used it will get info from VGDA??? Probably you can give a try to it: # lqueryvg -tAp hdiskX --> it will list lv identifiers as well # lslv --> for example "lslv 00cebffe00004c000000010363f50ac5.2" Please send some feedback if you could figure out something. Juraj Bocinec March 1, 2013 at 5:08 PM Hello, these data are not taken from ODM, because if i read data from VGDA with readvgda -l hdisk0 i get this info: ============= B: LV lvdump1 ============= LOGICAL VOLUME: lvdump1 VOLUME GROUP: ODM LV IDENTIFIER: 00f620a400004c0000000136544024bd.18 PERMISSION: read/write VG STATE: LVDD LV STATE: LVDD TYPE: ODM WRITE VERIFY: off MAX LPs: 512 PP SIZE: 256 megabyte(s) COPIES: CALC SCHED POLICY: parallel LPs: 30 PPs: CALC STALE PPs: CALC BB POLICY: relocatable INTER-POLICY: ODM RELOCATABLE: ODM INTRA-POLICY: ODM UPPER BOUND: ODM MOUNT POINT: DEV LABEL: ODM MIRROR WRITE CONSISTENCY: on/ACTIVE EACH LP COPY ON A SEPARATE PV ?: ODM Serialize IO ?: NO as you can see data that are missing are not those that are stored in ODM but rather in VGDA and this seems to be correct. Even LVCB is correct if i check with getlvcb -AT lvdump1. As for point 1 - i checked contents of /etc/objrepos on both cluster nodes and it's the same regarding permissions and ownership As for point 2 - if i use LV identifier with lslv i still get question marks instead of full information. I have opened PMR to IBM asking if this is a known bug. It's a possibility because here we use oslevel 6100-06-06-1140 with quite wild combination of efixes. I'll let you know when i have some info from them. Reply Juraj Bocinec March 1, 2013 at 5:10 PM Oops, seems i posted this as a comment rather than reply to proper thread, sorry for that. Juraj Bocinec March 14, 2013 at 2:33 PM Hello again, we have solved this problem. It turned out there have been wrong ownerships on several directories in / filesystem. So in case you come across this problem, check if your /usr or /etc is owned by correct user and not by some sap or oracle user. aix March 14, 2013 at 7:08 PM Thanks for the feedback...this was a strange issue, good to know this solution :-) Anonymous March 20, 2013 at 9:11 PM I have a scenario where i have deleted a file from the directory, but still the space was reclaimed to the file system. Need your inputs about what might be the case of this. aix March 20, 2013 at 9:49 PM Hi, if you delete a file, while it is opened by a process its space will not free up. Try this command: "fuser -dV " AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 6 of 8 5/23/2014 11:02 AM Reply Replies Reply Replies Reply It will shows deleted files (inode) with process ids which are open by a process (so its space could not be freed up). Solution: kill the process, wait for the process to finish or reboot the system. Satish Ch April 5, 2013 at 4:17 AM Hi, the LV in the rootvg hd5 is in closed/syncd state why? All other LVs are in open/syncd including paging(hd6) also. If we don't have mount to both LVs, but one is in Closed/syncd state and the other is Open/Syncd state. Coule you Please explain. Reply aix April 5, 2013 at 9:25 AM hd5 is the boot logical volume. It should not be in open state as you are not write in it regularly. It is used at boot time (or probably when you create the bootimage with bosboot command). hd6 is the paging space. It is in open state, because system is using it, in case of memory shortage. If you create another paging space, you can play to activate or turn it off (swapon/spapoff command), so it can be in closed state if needed. Anonymous May 16, 2013 at 4:17 PM Hi, I always use your blog. Its v helpful. I want to reduce the size of dumplv. How do I do that? reducelv dumplv 6? Thanks, Atif Reply aix May 16, 2013 at 4:24 PM Hi, thanks. I would delete that lv and recreate a new one. More info: http://aix4admins.blogspot.hu/2011/06/aix-generates-system-dump-when-severe.html (I've never heard about that command: reducelv...) Anonymous June 19, 2013 at 9:12 AM excellent information... it saves me time a lot while I work at my environment... Reply Vidyasagar Rao October 27, 2013 at 8:18 PM Hi I have problem in one my volume groups. I have 5 disks in the vg. after a reboot I could not mount the filesystems. it is throwing the error superblock dirty. I have ran fsck on the LV but still no luck. compared both the secondary superblock and primary both are same. Is there any issue with log logical volume. If log logical volume corrupts will it effect my other LV's I have tried to run logform on log LV but it is throwing me error"failure in logformat". My question is can I recreate log logical volume a new one. Reply aix October 27, 2013 at 9:24 PM Hi, in the following link it is written, logform should be done on closed LVs: http://www-01.ibm.com/support/docview.wss?uid=isg3T1000156 http://www-01.ibm.com/support/docview.wss?uid=isg3T1011054 As it is written above, if fsck was successful, then you are safe to do logform, or create a new log logical volume, otherwise filesystems can be corrupted. (And these actions can be done while filesystems are umounted.) Reply Javeed Butt October 31, 2013 at 7:03 PM Reply Javeed Butt November 1, 2013 at 6:12 PM in VIO server i am facing problem with LVs in one of vg as bellow and needs help there how i can change LV STATE from closed/syncd to open/syncd, will be thankful for any suggestion # lsvg -l diskvg diskvg: LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT disklv0 jfs2 273 273 1 open/syncd N/A disklv1 jfs2 273 273 1 closed/syncd N/A disklv2 jfs2 273 273 1 open/syncd N/A disklv3 jfs2 273 273 1 closed/syncd N/A disklv4 jfs 273 273 1 closed/syncd N/A disklv5 jfs 273 273 1 closed/syncd N/A disklv6 jfs 273 273 1 closed/syncd N/A disklv7 jfs 273 273 1 closed/syncd N/A disklv8 jfs2 150 150 1 closed/syncd N/A disklv9 jfs2 150 150 1 closed/syncd N/A disklv10 jfs2 150 150 1 closed/syncd N/A Reply Anonymous November 13, 2013 at 11:25 AM what is the use of jfs2 log? Reply AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 7 of 8 5/23/2014 11:02 AM Newer Post Older Post Home Subscribe to: Post Comments (Atom) Replies Reply Comment as: Publish Anonymous November 17, 2013 at 2:49 PM as far as i know the jfs2 log partition host disk changes (it use a db for that) before physically write it no the disks. Anonymous November 27, 2013 at 12:19 AM Thanks excellent info.. I have fixed the issue Reply chandra January 7, 2014 at 4:32 PM Reply chandra January 7, 2014 at 4:35 PM Hi can we reduce striped lv ?can you please explain the process Reply Anonymous February 5, 2014 at 8:46 PM I have one VG who is in use by phisycal machine, but this machine crashed. So I need mount this VG in one Lpar. Is it possible? Reply NIXGURU March 13, 2014 at 10:07 AM Had increased FS system size (sample_lv) on particular disks hdisk189 hdisk190 in a shared FS but unfortunately given addnl size occupies the space on other disks hdisk78 hdisk40 too In case, need to remove the addnl lv size occupied on hdisk78 hdisk40. How to achieve it. Pls advice. Code: lslv -m sample_lv|tail 1191 0121 hdisk78 0799 hdisk132 1192 0122 hdisk78 0298 hdisk40 Reply Template images by Storman. Powered by Blogger. AIX for System Administrators http://aix4admins.blogspot.in/2011/05/lvm-logical-volume-manager-lv... 8 of 8 5/23/2014 11:02 AM