Re: Moving System Disk
From: Ed Wilts (ewilts_at_ewilts.org)
Date: 08/12/05
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Date: 11 Aug 2005 15:06:27 -0700
> What advantages do you see in putting your system disk on the SAN?
None of my systems even have storage shelves - it's less parts to
maintain. I have to have the SAN anyway for my data and applications
so having the system up on the system disk won't do me any good except
for troubleshooting. For an ES40 like the original poster had, to boot
off a local disk, you have to buy a SCSI card (which also requires a
slot), a BA35x, plus one or preferably two disks. To boot off the SAN,
you simply go to the console, run wwidmgr, init, set your boot
parameters, and you're done - no extra hardware at all and you can boot
in a few minutes. Since you typically have dual HBAs, you have more
redundancy SAN booting than local booting.
I don't even bother with local page and swap disks any more - it's all
SAN-based.
> I'd want the capability of bringing up my VMS system without the SAN,
> should the SAN not be available for any reason.
All of my drives are also mirrored between EVA frames. I can't easily
lose the SAN. Dual HBAs to separate switches. Losing "the SAN" would
mean two EVA frames and both HBAs or both switches. I won't say it
can't happen, but it would be a major "oh sh*it" if it did.
.../Ed
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