AIX Rootvg mirror and sysdumplv

UNIX AIX
1

Guys,

In my AIX 6.1 box the rootvg was on hdisk2, I tried to migrated it to hdisk0

Added hisk0 to rootvg , mirrored rootvg and changed bootlist and and sucessfully rebooted from hdisk0

Now I tried to remove the hdisk2 from rootvg so breaked mirror

-bash-3.00# unmirrorvg rootvg hdisk2
0516-1246 rmlvcopy: If hd5 is the boot logical volume, please run 'chpv -c <diskname>'
        as root user to clear the boot record and avoid a potential boot
        off an old boot image that may reside on the disk from which this
        logical volume is moved/removed.
0516-1804 chvg: The quorum change takes effect immediately.
0516-1144 unmirrorvg: rootvg successfully unmirrored, user should perform
        bosboot of system to reinitialize boot records.  Then, user must modify
        bootlist to just include:  hdisk0.
-bash-3.00# bootinfo -b
hdisk0
-bash-3.00# chpv -c hdisk2
-bash-3.00# reducevg rootvg hdisk2
-bash-3.00# lspv
hdisk0          0005f8b2b7e6a0f7                    rootvg          active
hdisk1          0005f8b29b394a29                    datavg          active
hdisk2          0005f8b223e256a9                    rootvg        active

even after reducing the VG the hdisk2 still reflects in rootvg

Later I found that the Hdisk contained the sysdumplv

-bash-3.00# lspv -l hdisk2
hdisk2:
LV NAME               LPs     PPs     DISTRIBUTION          MOUNT POINT
lg_dumplv             12      12      00..12..00..00..00    N/A

I manually migrated the dumplv to hdisk0 and then removed the hdisk2 from rootvg sucessfully

-bash-3.00# reducevg rootvg hdisk2

-bash-3.00# lspv
hdisk0          0005f8b2b7e6a0f7                    rootvg          active
hdisk1          0005f8b29b394a29                    datavg          active
hdisk2          0005f8b223e256a9                    None

I wonder why the mirroring didn't happened for the dumplv when i used mirrorvg rootvg as i saw the following before fixing the issue where the DUMP lv is not mirrored by mirrorvg command where rest all LV's got mirrored.

-bash-3.00# lsvg -l rootvg
rootvg:
LV NAME             TYPE       LPs     PPs     PVs  LV STATE      MOUNT POINT
hd5                 boot       1       2       2    closed/syncd  N/A
hd6                 paging     2       4       2    open/syncd    N/A
hd8                 jfs2log    1       2       2    open/syncd    N/A
hd4                 jfs2       20      40      2    open/syncd    /
hd2                 jfs2       20      40      2    open/syncd    /usr
hd9var              jfs2       20      40      2    open/syncd    /var
hd3                 jfs2       20      40      2    open/syncd    /tmp
hd1                 jfs2       20      40      2    open/syncd    /home
hd10opt             jfs2       20      40      2    open/syncd    /opt
hd11admin           jfs2       1       2       2    open/syncd    /admin
lg_dumplv           sysdump    12      12      1    open/syncd    N/A
2

System dump devices should not be mirrored. You usually create 2 of them separate on each hdisk in your rootvg using smit or mklv. One will be your primary, the other the secondary.

Check out this link or check the man page of mirrorvg to read up on it:

IBM Info Center - mirrorvg

Helpful commands are:

sysdumpdev -l
# etc... or
smitty dump
3

Got it Thanks :slight_smile:

4

Here is a little bit more interessting info on system dump devices:
IBM Info Center, Configuring a Dump Device