topic Re: Mirror Disk Question in Operating System - HP-UX

Mirror Disk Question

ROSS HANSON — Thu, 08 Mar 2001 15:49:56 GMT

I had to add a disk to vg00 in order to increase the size
of /home. Do I now have to add a disk, brake my mirror,
then remirror vg00?

Re: Mirror Disk Question

Jeffrey L. Huff — Thu, 08 Mar 2001 18:03:00 GMT

Ross,

If I understood your question properly, no you should not have to break the mirror and re-mirror /home. This is assuming that you have already expanded /home. What you need to be careful of, is that the current mirror of /home is also not on the new disk that /home was expanded to. If you do a "lvdisplay -v /dev/vg00/home | more" that should give you the information you are looking for to determine the current status of both /home, and the mirror locations.

Re: Mirror Disk Question

Terja — Thu, 15 Mar 2001 12:53:15 GMT

try and keep your filesystems on one disk if you dont need absolute performance of striped volumes. I would suggest you pvmove /home from the orginal location to the new disk, thus if one disk fails you dont have to restore filesystems that are only partially on that disk. the pvmove goes somehing like

pvmove -n /dev/vg00/home /dev/dsk/cxtyd0 /dev/dsk/cztad0
where x,z are the channel ids, and y,a are the scsi addresses.

NB> you cannot pvmove between volumengroups.

Re: Mirror Disk Question

unixdaddy — Thu, 15 Mar 2001 12:59:12 GMT

This shouldn't be a problem IF there is enough space on your mirrored disk. As The system hasn't complained when you extend /home it should be OK. Use vgdisplay/lvdisplay to check that your mirrored disk has the same number of used extents as your original disk.

Re: Mirror Disk Question

Vincenzo Restuccia — Thu, 22 Mar 2001 19:12:43 GMT

lvreduce -m 0 /dev/vg00/lvol5
umount /home
lvextend -L xxx /dev/vg00/lvol5
extendfs -F vxfs /dev/vg00/lvol5
lvextend -m 1 /dev/vg00/lvol5 /dev/dsk/cxtyd0