[PLUG] striping in LVM or md?
Eric Wilhelm
scratchcomputing at gmail.com
Thu Jun 7 03:01:51 UTC 2007
# from Eli Stair
# on Wednesday 06 June 2007 02:00 pm:
>On 6/6/07, Eric Wilhelm <scratchcomputing at gmail.com> wrote:
>> I've got four SATA disks and want to setup a raid 10 with md.
>>
>> I'll be using md to create two mirror pairs.
>In short, I'd suggest using the md-raid10 module. It handles in one
>module/management point the striping/mirroring.
I forgot to mention that I have a pair of 120GB disks and one pair of
160GB disks. Does that change the answer.
On further reading, it sounds like md wants similar-sized devices for
raid0, though I guess I could do "linear" on top of raid1?
>Feel free to layer LVM on top.
Wouldn't that cost me just as much (or more) performance than doing the
striping in LVM? That's mainly what I was wondering with the original
question. i.e. if I'm doing LVM anyway, it couldn't possibly be
without cpu cost, so shouldn't I just mirror in md and then make a VG
out of md0 and md1?
Anybody got any references to benchmarks on that? All google gives me
is questions.
Thanks,
Eric
--
"You can't win. You can't break even. You can't quit."
--Ginsberg's Restatement of the Three Laws of Thermodynamics
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