Re: Booting P670 off Clariion with FC 6239
From: Greg (no_at_spam.com)
Date: 10/08/04
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Date: Thu, 07 Oct 2004 21:02:18 -0400
Douglas R. Probst wrote:
> Worked with Power Path years ago before boot from fiber was supported. We
> don't boot from fiber at our shop, but I did try it just for fun.
> I will give you the method for IBMs SDD.
> Booting from a sudo device vpath or powerpath device is NOT supported.
> With SDD, there is a command you can run to prevent a vpath from being
> created, leaving just hdisks. I don't remember if EMC has such a thing but I
> seem to remeber and exclude file.
> Zone 2 disk to the server, one on one path, the other on the other path.
> Now load your OS on one of the disk with alt_disk_install or if you want to
> do a NIM install, take the LPAR down and follow the normal process and
> choose your 2 fiber atached disk for the install.
> The firmware will see them if they are supported for boot, I believe EMC as
> sell as Shark are supported.
> Note: you need to mirror your rootvg between the 2 fiber disks, so make sure
> they are on different paths with different switches.
> When you yank a cable, the box will stay up but you will get a million
> errors and will have to reboot to get the path back and resync the mirror.
> This is not unexpected, if you pulled a scsi cable the same thing would
> happen. Personaly, I feel you can't beat scsi attached disk for
> Availabilty... but that really doesn't mater any more does it....
> Doug
Check SDDPCM - the path control module for ESS that sits on top of AIX
MPIO allows boot support. Otherwise, you can point two LUNs to two
fibre adapters and do AIX mirroring the old fashioned way.
Greg.
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