root and shared disks on vPars

[Ming Zhao]

Hi specialists,

I have an N-class with 1 SCSI card on each I/O chasis. Assume that this N-class has enough CPUs, memory and NICs, all necessary s/w and f/w are updated.

I want to create 2 vpars and build a MC/SG testing environment.

I have 4 disks connected serially with scsiID 6,5,4 and 3. Now I connect scsi card1 to disk6, so card1 can see all 4 disks. Then I connect scsi card2 on other I/O chasis to disk3, so card2 can see all 4 disks. No alternate paths are configured. No mirroring needed.

My questions are:
1. Can I use disk6 as root disk for vpar1 and disk3 as root disk for vpar2?
2. Can I use disk4 and disk5 as shared disks between these 2 vpars?

Regards,

Ming

[James Murtagh]

Hi,

Looking through the Vpars internals it would appear both your queries are possible. Vpars reserves up to the SBA, so each SCSI card. What hangs off them should be subject to the same rules as two seperate hpux systems. Obviously you wouldn't create a live cluster in this way, as I'm sure you know. Also, when you say "shared" this is subject to the same rules, again, as two seperate hpux systems, without the optional S/G SLVM(?) product ( sure you know what I mean ;-) ).

regards,

James.

[Jean-Louis Phelix]

hi,

I agree with James. It should work ... in a testing environment only ...

Regards.

[Ming Zhao]

Thanks for your quick response.

It is not supported to have the root/boot/swap disks for more than one node on a shared SCSI bus. The reason for this is that the HP-UX boot process issues bus resets on the root/boot/swap bus, which can cause problems for any other initiators connected to that bus.

Since this root disk confiuration doesn't support by Npar, so it doesn't support by vPar, I think.