LVM (was Re: why you have multiple partitions)
Gregory K. Ruiz-Ade
gkade at bigbrother.net
Thu Dec 12 18:40:14 PST 2002
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On Thursday 12 December 2002 17:12, Stewart Stremler wrote:
> Sure it is. I can take my SCSI drive, ethernet hub, or amplifier and
> speakers and plug 'em into another machine. No worries.
Okay, there you have a point. Perhaps someone should come up with a
standardized way for writing RAID sets across the component devices, that all
the RAID card manufacturers would support.
Hmm... Oh, yeah! Pipe dream. :(
> Well, I don't do SCSI on x86 boxen anymore because the driver issues
> just aren't worth it. Then again, I try not to do x86 boxen anymore
> anyway because I want to blow the damn things up. But that's just me.
never had any problems with the Adaptec and Mylex (formerly Buslogic) cards
I've used. Or the Symbios cards, but I've only ever used one of them.
> Well, because I've been burned, and burned hard, with software RAID.
> Someone pulled the power plug, and the RAID was hosed. Utter and
> complete loss of data. (The system sync'd itself once a minute, and
> nobody was logged into the system.)
So, you want RAID, and you want it to be portable across systems. Do you want
it portable across OS's, to? Back up to my comment about making standardized
RAID writing formats. Oh, and for the record, any hardware raid controller
worth what you paid for it would have battery-backed cache on the controller,
and would finish it's writes when next the system is powered up. :)
> I just don't trust software RAID. Especially under Linux.
Neither do I, when dealing with IDE devices, but I've heard of people being
quite happy with it (on both SCSI and IDE, go figure).
> What sort of RAID did you choose?
The Dell PowerEdge 4600's have a built-in Adaptec RAID controller that is
actually quite smart in terms of configurability options. We also got the
split-backplane option, so half the drive bays are on a seperate SCSI channel
than the other half, to eek out a little more performance. We're doing
RAID-10 (non-parity striping across sets of mirrors), with one half of each
mirror set on either of the SCSI channels. It's FAST.
> I keep looking at the external all-enclosed boxes. SCSI or firewire seem
> to be the most common solutions. But they're several thousand $, it
well, there's also fiberchannel, but that's buku $$$. Then stand-alone SCSI
RAID enclosures are indeedy pricey, at anywhere from $1500-$4500, for
anywhere from 4 to 8 HD's, also depending on what kind of capabilities you
want. There are models that take IDE drives, and models that take SCSI
drives, and both variants act like a single SCSI device and connect via
UltraLVD SCSI to a host computer. *that* box you can take and plug into
whatever system you want. It's hardware RAID, but with the managemetn
software built into a little control panel on the front, and removed from the
SCSI host adapter.
I'd love to have one of them... but for $3k I can do a lot of more important
Gregory K. Ade <gkade at bigbrother.net>
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