topic Re: RA3600 HPUX 11.31 and EVA440 Disks in Operating System - HP-UX

RA3600 HPUX 11.31 and EVA440 Disks

CJENSEN_1 — Thu, 27 May 2010 14:17:50 GMT

Hello Guru's,
Well I have another disk question. We have two Dual Port Fiber Cards on the RX3600 server. Due to space issues, we only have one of those ports on one of the cards connected to the EVA4400. Of course, we can now go ahead an make our EVA4400 disks, and do the VG creation on Unix. However, the other paths will be added in later. How much work is this to do later? Or, are we better off getting all the paths in place, and then do EVA disk creation, and UX VG creation.
Thanks...colin

Re: RA3600 HPUX 11.31 and EVA440 Disks

stephen peng — Thu, 27 May 2010 14:46:44 GMT

I don't consider you need to do much work on os side when you employ other HBA in 11.31, using persistent DSF.

Re: RA3600 HPUX 11.31 and EVA440 Disks

CJENSEN_1 — Thu, 27 May 2010 14:48:20 GMT

I take it the persistent DSF automates the paths (the pvlinks), as opposed to the legacy DSF?

Re: RA3600 HPUX 11.31 and EVA440 Disks

Steven E. Protter — Thu, 27 May 2010 14:50:26 GMT

Shalom Colin,

Yes it is easier to handle all paths at the beginning.

However with 11.31 a two step process will not be too difficult.

The built in multi-path for 11.31 should identify the disks and take care of alternate path issues with limited admin intervention.

SEP

Re: RA3600 HPUX 11.31 and EVA440 Disks

CJENSEN_1 — Thu, 27 May 2010 14:53:32 GMT

Under 11.11, a simple "vgdisplay -v vg##" would show the alternate and primary links. Is there a similar command in 11.31, that would verify that the RX server is seeing all available paths into the EVA? Again, my concern is adding in the fibre connections after the fact.

Re: RA3600 HPUX 11.31 and EVA440 Disks

stephen peng — Thu, 27 May 2010 14:59:28 GMT

ioscan -m dsf will show you the relationship between P_DSF and L_DSF.

Re: RA3600 HPUX 11.31 and EVA440 Disks

stephen peng — Thu, 27 May 2010 15:02:50 GMT

furthermore, there should be configuration at EVA4400 to add new HBA WWN to host configuration, but I don't remember how to achive it.

Re: RA3600 HPUX 11.31 and EVA440 Disks

CJENSEN_1 — Thu, 27 May 2010 15:06:39 GMT

1) Yes, there should be configuration to do on the EVA side when a new HBA is added. I always like to reconcile this from UX side of things, to be extra-thorough.
2) Yes, I have used the ioscan -m dsf. It gives a good reconciliation. So I take it that when the second HBA is added, I will see additional information in the ioscan -m dsf. Sorry for the basic question, but I just want to get a head's up for when the disks are added.
Thanks...colin

Re: RA3600 HPUX 11.31 and EVA440 Disks

stephen peng — Thu, 27 May 2010 15:11:17 GMT

remember creating vg with P_DSF, a little bit annoying,regards.

Re: RA3600 HPUX 11.31 and EVA440 Disks

CJENSEN_1 — Thu, 27 May 2010 15:31:27 GMT

Yes, the newer persistent DSF seems like a great improvement from "hard-coding" in pvlinks. Thanks for your help...colin

Re: RA3600 HPUX 11.31 and EVA440 Disks

CJENSEN_1 — Thu, 27 May 2010 20:34:47 GMT

Thanks.