[Beowulf] RAID storage: Vendor vs. parts
alvin at Mail.Linux-Consulting.com
Tue Feb 22 19:43:34 EST 2005
hi ya steve
On Tue, 22 Feb 2005, Steve Cousins wrote:
> That's what I'm shooting for. Anybody have good luck with volumes greater
> than 2 TB with Linux? I think LSI SCSI cards are needed (?) and the 2.6
> Kernel is needed with CONFIG_LBD=y. Any hints or notes about doing this
> would be greatly appreciated. Google has not been much of a friend on
> this unfortunatlely. I'm guessing I'd run into NFS limits too.
for files/volumes over 2TB ... it's a question of libs, apps and kernel
everything has to work ... which is not always the case
i don't play much with 2.6 kernels other than on suse-9.x boxes
> Also, am I being overly cautious about having a spare RAID controller on
> hand? How frequent do RAID controllers go bad compared to disks, power
> supplies and fan modules? I'd guess that it would be very infrequent.
it's always better to have spare parts ... ( part of my requirement ) if
they expect the systems to be available 24x7 ...
- more importantly, how long can they wait, when silly inexpensive
things die, before it gets replaced
- dead fans is $2.oo - $15 each to keep the disks cool
- power supply is $50 range ... but if one bought n+1 powersupply
than its supposed to not be an issue anymore, but you will need to
have its replacement handy
- raid controllers should NOT die, nor cpu, mem, mb, nic, etc
and it's not cheap to have these items floating around as spare
- ethernet cables will go funky if random people have access
to the patch panels ... ( keep the fingers away )
- ups will go bonkers too
- what failure mode can one protect against and what will happen
if "it" dies
- best protection against downtime for users is to have an
warm-swap server which is updated a hourly or daily ...
( my preference - 2nd identical or bigger-disk capacity system )
> Looking back at my own experience I think I've had to return one out of 15
> in the last eight years, and that was bad as soon as I bought it.
seems too high of a return rate ?? 1 out of 15 ??
> If this is too off-topic let me know and I'll move it elsewhere.
24x7x365 uptime compute environment is fun/frustrating stuff on tight
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