Is it possible to mirror from 1 - many physical disks?

[Jason Fedynak]

We have hpux11i v1 and we are 'looking' to move data using mirrors. The issue is that we want to use smaller size cu:ldevs.

For example we have 1x10GB pv and will add 10x1GB pv's to the volume group. Any way to mirror the 1x10GB to the 10x1GBs?

Thanks,
JasonF

[Jason Fedynak]

Oh and to top it all off we want to strip the 10x1GB disk. Is this at all possible?

[Torsten. · Accepted solution]

Hi,

yes, you can mirror 1 disks to a set of other disks.
You can specify the destination disk in your lvextend command
or
you can use PVG (physical volume groups - see http://docs.hp.com/en/B2355-60105/lvmpvg.4.html )

A striped mirror is only supported for 11.31 (11iv3).

[Sundar_7]

Jason,

Yes, you can add the 10 * 1 GB PVs to the volume group.

You could either use the PVG groups or you could manually specify all the 10 PVs with the lvextend -m command to create the mirrors on the 10 new PVs.

But you cannot stripe the mirror. 11.11 supports only extent based mirrors.

Sundar.

[Jason Fedynak]

Do you know if striping the mirrors is only available as part of HPUX11.31 OS or could a upgrade of OnlineJFS do.

[Torsten.]

As said before, striped mirrors are only in 11.31.
Previous versions can use distributed extends, see

http://docs.hp.com/en/B2355-60105/lvcreate.1M.html

Consider to backup the data and restore to a striped LVOL.

(I'm not sure if this gives you more performance on your XP array, but it depends on your arrays LUN configuration).

[Jason Fedynak]

Thanks. So I tried the -D(istributed) option but it came back as an invalid argument. I checked the HP-UX revision and it is for 11i v2.

[Sundar_7]

Jason,

You cannot use the -D option with lvextend. It should be used at the time of lvcreation with the lvcreate command.

-D is a valid option with 11.11.

Sundar.

[Jason Fedynak]

Yes, sorry. I just realized that this morning. Since we cannot create the lvol with the -D option (as it has data on it already). I am going to try to create a new lvol to mimic the current env., mirror the lvol, lvchange -a n, lvchange -D y, lvchange -a y, and remount ....

lets see if this works.