Table of Contents
AIX disk migration
Here is a procedure for migrating from old disks to new disks, with AIX Volume Manager only.
AIX is based on a integrated Logical Volume Manager. The OS is installed into a volume group: rootvg (required). Everything for the base OS is included into rootvg, no /boot like Linux. Migration must be done online. Other volume group can exist on a server. Other Volume manager are supported for datas: GPFS, Oracle OCFS, Veritas Volume Manager…
A volume group is composed from 1 to 1016 disks or LUNs. To move datas on new disks, you can use raid 1, or migratepv command which moves the datas online from one disk to another.
Data and OS can be migrated from disks even if it's a different kind of disk (SCSI,SATA,SAS,FC …), or size. You just need to have enough space to copy all the datas to the new disks.
Move a rootvg to new disks (if boot on SAN, or if you expect to change the disk type)
For a rootvg volume group, you must use mirroring. On AIX the volume group (VG) contains logical volumes (LV), with or without a mount point (filesystem). Swap and boot logical volumes doen't have a mount point. Mirroring is done per logical volume, and you can have up to 3 copies of an LV per VG.
- First step install the new drivers if needed.
Create a folder on the AIX server (Ex: # mkdir /tmp/mpio) and put the drivers into that directory Install the drivers with:
[eco-aix61@root] /root> smitty installp
–> Install Software
In the field “Software Installation” select F4 (or ESC+4 in console), and select the components MPIO (select a minimum, the needed packages will be installed as requisite) with F7 (or ESC+7) and Enter. If needed in the filed “ACCEPT new license agreements?” select yes with TAB key:
Install Software
[Entry Fields]
* INPUT device / directory for software /tmp/mpio
* SOFTWARE to install [_all_latest]
PREVIEW only? (install operation will NOT occur) no
COMMIT software updates? yes
SAVE replaced files? no
AUTOMATICALLY install requisite software? yes
EXTEND file systems if space needed? yes
OVERWRITE same or newer versions? no
VERIFY install and check file sizes? no
Include corresponding LANGUAGE filesets? yes
DETAILED output? no
Process multiple volumes? yes
ACCEPT new license agreements? no
PREVIEW new LICENSE agreements? no
Drivers for IBM DS3k,4k,5k are included in the base operating system. For DS8k and SVC install SDDPCM. For EMC choose in the Powerpath the component MPIO…
- Create and map the new LUNs to the AIX server.
- Check for new hardware on the AIX server, with cfgmgr:
Before:
[eco-aix61@root] /root> lspv hdisk0 005a4b0ab1c32955 rootvg active hdisk1 005a4b1ab2ac8166 tsmvg active hdisk2 005a2c7af5b4a34a stgvg active
After:
[eco-aix61@root] /root> cfgmgr [eco-aix61@root] /root> lspv hdisk0 005a4b0ab1c32955 rootvg active hdisk1 005a4b1ab2ac8166 tsmvg active hdisk2 005a2c7af5b4a34a stgvg active hdisk3 none None
If a driver is missing, the server will say which package to install.
- Extend the Volume Group rootvg
[eco-aix61@root] /root> extendvg rootvg hdisk3 [eco-aix61@root] /root> lspv hdisk0 005a4b0ab1c32955 rootvg active hdisk1 005a4b1ab2ac8166 tsmvg active hdisk2 005a2c7af5b4a34a stgvg active hdisk3 005a2c1a818ef5ae rootvg active
- Mirror the Volume Group on the new disks
-S option to synchronize in the background
[eco-aix61@root] /root> mirrorvg -S rootvg hdisk3
- Recreate the boot logical volume on all disks that have the boot logical volume (hd5)
[eco-aix61@root] /root> lslv -l hd5 hd5:N/A PV COPIES IN BAND DISTRIBUTION hdisk0 001:000:000 100% 001:000:000:000:000 hdisk3 001:000:000 100% 001:000:000:000:000 [eco-aix61@root] /root> bosboot -ad hdisk0 [eco-aix61@root] /root> bosboot -ad hdisk3
- Break the copy on old disks
Wait first the end of the synchronization before breaking the mirror, AIX won't leave you to break a not synchronized VG
[eco-aix61@root] /root> lsvg rootvg VOLUME GROUP: rootvg VG IDENTIFIER: 005a2c1a00004c000000011c3265d620 VG STATE: active PP SIZE: 64 megabyte(s) VG PERMISSION: read/write TOTAL PPs: 1084 (69376 megabytes) MAX LVs: 256 FREE PPs: 150 (9600 megabytes) LVs: 20 USED PPs: 934 (59776 megabytes) OPEN LVs: 15 QUORUM: 1 (Disabled) TOTAL PVs: 2 VG DESCRIPTORS: 3 STALE PVs: 1 STALE PPs: 436 ACTIVE PVs: 2 AUTO ON: yes MAX PPs per VG: 32512 MAX PPs per PV: 1016 MAX PVs: 32 LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no HOT SPARE: no BB POLICY: relocatable PV RESTRICTION: none
If the parameter “STALE PPs” has a value 0, then break the mirror on the old disk:
[eco-aix61@root] /root> unmirrorvg rootvg hdisk0
- Recreate the boot logical volume and set the bootlist to be able to boot on new disks
[eco-aix61@root] /root> bosboot -ad hdisk3 [eco-aix61@root] /root> bootlist -m normal hdisk3
- Move LV if still exists from old disks to new (for example if you have dump devices which can't be mirrored)
[eco-aix61@root] /root> lspv -l hdisk0 hdisk0: LV NAME LPs PPs DISTRIBUTION MOUNT POINT lg_dumplv 16 16 00..16..00..00..00 N/A [eco-aix61@root] /root> migratepv hdisk0 hdisk3
- Remove old disks from rootvg
[eco-aix61@root] /root> reducevg rootvg hdisk0
- Remove old disks from AIX server
[eco-aix61@root] /root> rmdev -dl hdisk0
- Remove the map on old disks
Move a data VG to new disks
First step install the new drivers if needed.
Create and map the new LUNs to the AIX server.
Extend the data Volume Group
Mirror the Volume Group on the new disks
Break the copy on old disks
Remove old disks from data VG
Remove old disks from AIX server
Remove the map on old disks
ANNEXE
List disks available, and their VG:
[eco-aix61@root] /root> lspv hdisk0 005a4b0ab1c32955 rootvg active hdisk1 005a4b1ab2ac8166 tsmvg active hdisk2 005a2c7af5b4a34a stgvg active hdisk3 005a2c7a614de6f4 wparvg active
List all VG (with -o to list only active VG):
[eco-aix61@root] /root> lsvg rootvg tsmvg stgvg wparvg
List the content of a VG (if PPs are 2x LPs, then the LV is mirrored:
[eco-aix61@root] /root> lsvg -l rootvg rootvg: LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT hd5 boot 1 1 1 closed/syncd N/A hd6 paging 8 8 1 open/syncd N/A hd8 jfs2log 1 1 1 open/syncd N/A hd4 jfs2 3 3 1 open/syncd / hd2 jfs2 45 45 1 open/syncd /usr hd9var jfs2 16 16 1 open/syncd /var hd3 jfs2 17 17 1 open/syncd /tmp hd1 jfs2 1 1 1 open/syncd /home hd10opt jfs2 70 70 1 open/syncd /opt hd11admin jfs2 2 2 1 open/syncd /admin lg_dumplv sysdump 16 16 1 open/syncd N/A rootlv jfs2 3 3 1 open/syncd /root softlv jfs2 280 280 1 open/syncd /software fslv00 jfs2 2 2 1 closed/syncd /wpars/wpar1 fslv01 jfs2 1 1 1 closed/syncd /wpars/wpar1/home fslv02 jfs2 2 2 1 closed/syncd /wpars/wpar1/tmp fslv03 jfs2 2 2 1 closed/syncd /wpars/wpar1/var pconsolelv jfs2 3 3 1 open/syncd /pconsole loglv01 jfslog 1 1 1 open/syncd N/A lv00 jfs 1 1 1 open/syncd /var/epdm
List characteristics of a VG (size used,total size…)
[eco-aix61@root] /root> lsvg rootvg VOLUME GROUP: rootvg VG IDENTIFIER: 005a2c1a00004c000000011c3265d620 VG STATE: active PP SIZE: 64 megabyte(s) VG PERMISSION: read/write TOTAL PPs: 542 (34688 megabytes) MAX LVs: 256 FREE PPs: 67 (4288 megabytes) LVs: 20 USED PPs: 475 (30400 megabytes) OPEN LVs: 15 QUORUM: 2 (Enabled) TOTAL PVs: 1 VG DESCRIPTORS: 2 STALE PVs: 0 STALE PPs: 0 ACTIVE PVs: 1 AUTO ON: yes MAX PPs per VG: 32512 MAX PPs per PV: 1016 MAX PVs: 32 LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no HOT SPARE: no BB POLICY: relocatable PV RESTRICTION: none
List physical disks and type:
[eco-aix61@root] /root> lsdev -Cc disk hdisk0 Available 1S-08-00-8,0 16 Bit LVD SCSI Disk Drive hdisk1 Available 1S-08-00-9,0 16 Bit LVD SCSI Disk Drive hdisk2 Available 1S-08-00-10,0 16 Bit LVD SCSI Disk Drive hdisk3 Available 1S-08-00-11,0 16 Bit LVD SCSI Disk Drive
List the characterics of a disk, serial number…:
[eco-aix61@root] /root> lscfg -vpl hdisk0 hdisk0 U0.1-P2/Z1-A8 16 Bit LVD SCSI Disk Drive (36400 MB) Manufacturer................IBM Machine Type and Model......IC35L036UCDY10-0 FRU Number..................00P3831 ROS Level and ID............53323847 Serial Number...............E3VN67AC EC Level....................H32224 Part Number.................08K0293 Device Specific.(Z0)........000003029F00013A Device Specific.(Z1)........07N4972 Device Specific.(Z2)........0068 Device Specific.(Z3)........03119 Device Specific.(Z4)........0001 Device Specific.(Z5)........22 Device Specific.(Z6)........ PLATFORM SPECIFIC Name: sd Node: sd Device Type: block
