replacing mirror disk

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Operating Systems AIX replacing mirror disk
# 1  
Old 09-15-2011
replacing mirror disk

Hi Admins,

I am new into aix.I was surfing aix pages and reading how to replace failed mirror disks.I read in one of the posts that we have to reboot the server to replace the disk. actually i was a HPUX admin and many times replaced root mirror disk online.Ofcourse it was hot swappable.

Now i have not checkd my aix disks are hot swappable or not.and OS version is 5.3. Need i reboot server to replace disk in aix 5.3.. please explain in detail.

# 2  
Old 09-16-2011
As far as I am concerned the simple answer is no you do not have to reboot! First you unmirror rootvg; then withdraw the offending disk with reducevg; delete the disk the rmdev; if the disk is hot swap then withdraw the disk and replace it, however if the disk is not hot swap the system will need to be shutdown and the disk replaced. Once the system is restarted add the new disk to rootvg with the extendvg command and remirror to the new drive. Once this is complete do not forget to set the bosboot and bootlist.

That is that!
# 3  
Old 09-16-2011
I will use rootvg as an example with hdisk0 and hdisk1, where hdisk1 will be the failing one. This manual suppose that failing disk hdisk1 is still available and not in missing state and is hot swap-able and secondary dump device is used on hdisk1.

1. Unmirror rootvg
unmirrorvg rootvg hdisk1
2. Check where your primary/secondary sysdump logical volume goes
sysdumpdev -l
3. If it goes to lv which is on failing hdisk1 redirect it for time being to /dev/sysdumpnull, see sysdumpdev
sysdumpdev -P -s /dev/sysdumpnull
4. Check if you have any logical volumes left on hdisk1
lspv -l hdisk1
5. If you have any logical volumes left on failing disk you can move them to hdisk0, if you need to (if you have secondary dump device present you can remove it with rmlv -f secondary_dump_device_lv_name)
migratepv hdisk1 hdisk0
6. Reduce hdisk1 from rootvg
reducevg rootvg hdisk1
7. Take location code of failing hdisk1
lscfg -vl hdisk1
8. Set hdisk1 in to define state
rmdev -l hdisk1
9. Use diag to replace and identify failing hdisk1
10. Once done add new replaced hdisk1 to rootvg
extendvg rootvg hdisk1
11. Create secondary dump device on hdisk1 if needed and point second dump device to it (xx represent the size which should be and it can be calculated with command sysdumpdev -e (in bytes))
mklv -y your_second_dump_lv_name -t sysdump rootvg xx hdisk1
sysdumpdev -P -s /dev/your_second_dump_lv_name
12. Mirror rootvg
nohup mirrorvg '-S' rootvg hdisk1 &
13. Create boot image on hdisk1
bosboot -ad /dev/hdisk1
14. Add hdisk1 to bootlist
bootlist -m normal hdisk0 hdisk1
15. Check bootlist
bootlist -m normal -o
That should be all. If I forgot something please advice me.

Thank you.

Last edited by phobus; 09-16-2011 at 02:23 PM..
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