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====== 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:
<cli prompt='>'>
[eco-aix61@root] /root> smitty installp
</cli>
--> 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:
<code>
                                                         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        
</code>
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:
<cli prompt='>'>
[eco-aix61@root] /root> lspv
hdisk0          005a4b0ab1c32955                    rootvg          active
hdisk1          005a4b1ab2ac8166                    tsmvg           active
hdisk2          005a2c7af5b4a34a                    stgvg           active
</cli>
After:
<cli prompt='>'>
[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 
</cli>
If a driver is missing, the server will say which package to install.\\
  * Extend the Volume Group rootvg\\
<cli prompt='>'>
[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
</cli>
  * Mirror the Volume Group on the new disks\\
-S option to synchronize in the background
<cli prompt='>'>
[eco-aix61@root] /root> mirrorvg -S rootvg hdisk3
</cli>
  * Recreate the boot logical volume on all disks that have the boot logical volume (hd5)\\
<cli prompt='>'>
[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
</cli>
  * 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
<cli prompt='>'>
[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
</cli>
If the parameter "STALE PPs" has a value 0, then break the mirror on the old disk:
<cli prompt='>'>
[eco-aix61@root] /root> unmirrorvg rootvg hdisk0
</cli>
  * Recreate the boot logical volume and set the bootlist to be able to boot on new disks\\
<cli prompt='>'>
[eco-aix61@root] /root> bosboot -ad hdisk3
[eco-aix61@root] /root> bootlist -m normal hdisk3
</cli>
  * Move LV if still exists from old disks to new (for example if you have dump devices which can't be mirrored)\\
<cli prompt='>'>
[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
</cli>
  * Remove old disks from rootvg\\
<cli prompt='>'>
[eco-aix61@root] /root> reducevg rootvg hdisk0
</cli>
  * Remove old disks from AIX server\\
<cli prompt='>'>
[eco-aix61@root] /root> rmdev -dl hdisk0
</cli>
  * 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:
<cli prompt='>'>
[eco-aix61@root] /root> lspv
hdisk0          005a4b0ab1c32955                    rootvg          active
hdisk1          005a4b1ab2ac8166                    tsmvg           active
hdisk2          005a2c7af5b4a34a                    stgvg           active
hdisk3          005a2c7a614de6f4                    wparvg          active
</cli>

List all VG (with -o to list only active VG):
<cli prompt='>'>
[eco-aix61@root] /root> lsvg
rootvg
tsmvg
stgvg
wparvg
</cli>

List the content of a VG (if PPs are 2x LPs, then the LV is mirrored:
<cli prompt='>'>
[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
</cli>

List characteristics of a VG (size used,total size...)
<cli prompt='>'>
[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
</cli>

List physical disks and type:
<cli prompt='>'>
[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
</cli>

List the characterics of a disk, serial number...:
<cli prompt='>'>
[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
</cli>
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