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Surestore SC10 - mirror help

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Sally Devine
Frequent Advisor

Surestore SC10 - mirror help

I have one SC10 with 6 18GB disks in it. The client wants them mirrored therefore making only 3 disks useable. Can I mirror them through SAM (although I don't think so because of only the one controller) or do I have to do all the mirroring with software (Mirrordisk/UX)?

Thank you,
5 REPLIES
Scott Van Kalken
Esteemed Contributor

Re: Surestore SC10 - mirror help

You are correct on both counts.

You can mirror via sam, but you do need MirrordiskUX installed.
Michael Tully
Honored Contributor

Re: Surestore SC10 - mirror help

Hi,

Yes you can mirror across one controller,
as this will give you at least some redundancy.
Yes you will need to purchase MirrorDisk/UX
to do the job. Unfortunately there is
not a trial version that you could load
unlike some other products HP offer.

-Michael
Anyone for a Mutiny ?
Stefan Saliba
Trusted Contributor
Solution

Re: Surestore SC10 - mirror help

You can mirror on a single SC10. What I suggest though is to have the SC10 with two bus controllers and 2 SCSI controllers on the host. Like this you access the first three disks from one channel and the next 3 from the other. This is done to improve access and high availabilty although you will still work with one bus controller and one SCSI controller.

You need to install Mirror Disk/UX which you need to buy a license for and install it from the applications CD that come with your HPUX media.

A quick howto to mirror will be...

assume say with 2 disks c1t6d0 c1t5d0
assume vg name is vgmirror
so
pvcreate both disks
vgcreate vgmirror containing the two disks
create a logical volume on one disk by using lvcreate then lvextend the size you require.

then assume lvname is lvolmirror. what you do is lvextend -m1 /dev/vgmirror/lvolmirror /dev/dsk/c1t5d0 and it will create a mirror of lvolmirror on the other disk.

You can do all this with sam if you want although I would suggest command line for better flexibility


good luck
stefan



Sally Devine
Frequent Advisor

Re: Surestore SC10 - mirror help

I think I am understanding this beast a little more now. Just to confirm, this is a JBOD Disk System and NOT an array (unless it was in a FC60 then it would be an array). So it cannot be RAID'd like you do with an array (where you select the disks and then Raid 0-5), it can only be done at the software level using Mirrordisk/UX?

Thanks for the help,
Sally
Michael Tully
Honored Contributor

Re: Surestore SC10 - mirror help

Hi,

'sam' can do the job for you, but using
the command line is quite simple, and
you can learn something at the same time.

You can't mirror anything unless the
MirrorDisk/UX software is loaded first.
There are options within programs like
'lvextend' that will not work without
the filesets being loaded from MirrorDisk/UX
first.

If you have six disks (3 pairs) you could
use this scenario. If you can a second
controller is even better.
It wouldn't matter if the disks are JBOD's
or RAID/5 you can still mirror them.
If the disks are not added to the volume
group:
# pvcreate -f /dev/rdsk/c1t1d1 (for each disk)
# /usr/sbin/vgextend /dev/dsk/c1t1d0 (for each disk)

Once added or already added:
# lvextend -m1 /dev/vgxx/lvol1 /dev/dsk/c1t1d0 (new disk)

To check you can run this command beforehand
# vgdisplay -v /dev/yourvg
and look for the number of disks that each LV
has. Afterwards run the same command and this
should be be increased.

HTH
-Michael
Anyone for a Mutiny ?