Add primary disk back to mirror

[sagi_1]

Hi All,

I have a rx2620 inwhich the primary disk failed and i am able to boot the server with teh secondary disk.
Now i have to add a new primary disk back to the mirror. Can you please advice me if a simple lvsync command would do?
Please inform if there is any risk involved in this.

Thanks in advance.

Regards,
Sagar.

[Johnson Punniyalingam]

Restoring Mirrored disk after Replacement of failed disk
=============================================

# vgcfgrestore -n vg00 /dev/rdsk/cxtxdx
# vgchange -a y vg00
# vgsync vg00

Script to run to check status of vgsync:

while true
do
pvdisplay -v /dev/dsk/c1t2d0|grep stale|wc -l sleep 5 done

[Johnson Punniyalingam]

1) Remove lvol mirrors:
# lvreduce -m 0 /dev/vg00/lvol2 /dev/dsk/cxtxdx
# lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/cxtxdx
2) Remove faulty drive from vg00:
# vgreduce /dev/vg00 /dev/dsk/cxtxdx
3) Call for CE replacement of hot-swappable drive cxtxdx at H/W path 0/0/2/1.6.0:
SCSI describe of /dev/rdsk/cxtxdx:
vendor: HP 36.4G
product id: ST336706LC
type: direct access
size: 35566480 Kbytes
bytes per sector: 512
4) When drive is replaced, add back into vg00 and make bootable:
# pvcreate -B /dev/rdsk/cxtxdx
# vgextend /dev/vg00 /dev/dsk/cxtxdx
# mkboot -l /dev/rdsk/cxtxdx
5) Re-mirror logical volumes, must be done in lvol order:
# lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/cxtxdx
# lvextend -m 1 /dev/vg00/lvol2 /dev/dsk/cxtxdx
# lvextend -m 1 /dev/vg00/lvol3 /dev/dsk/cxtxdx
And repeat for remaining logical volumes lvol4 through lvol13.

[sagi_1]

Hi John,

Thanks for the reply. Please advice me if i have to move the lvmtab file before restoring the vg00.
are there any further steps to be taken in case of the boot disk.

Regards,
Sagar.

[Aneesh Mohan]

Hi Sagar,

Just do.

#vgchange -a y vg00
#vgsync vg00

Regards,
Aneesh

[Johnson Punniyalingam]

>>Please advice me if i have to move the lvmtab file before restoring the vg00.
are there any further steps to be taken in case of the boot disk<<

NO need,

[R.K. #]

Hi Sagar,

Moving lvmtab is NOT required.

[Torsten. · Accepted solution]

Better to follow the official procedure:

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf


In the procedures above I miss some very important steps regarding make the disk bootable (idisk, mkboot etc)