'md' performs wonderfully. Thanks to every contributor!
I pitted it against a 3ware 9650 and 'md' won on nearly every account (albeit on
RAID5 for sequential I/O the 3ware is a distant winner):
http://www.makarevitch.org/rant/raid/#3wmd
On RAID10 f2 a small read-ahead reduces the throughput on se
Peter Grandi wrote:
In general, I'd use RAID10 (http://WWW.BAARF.com/), RAID5 in
Interesting movement. What do you think is their stance on Raid Fix? :)
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>>> On Thu, 21 Feb 2008 13:12:30 -0500, Norman Elton
>>> <[EMAIL PROTECTED]> said:
[ ... ]
normelton> Assuming we go with Guy's layout of 8 arrays of 6
normelton> drives (picking one from each controller),
Guy Watkins proposed another one too:
«Assuming the 6 controllers are equal, I would m
Pure genius! I wonder how many Thumpers have been configured in
this well thought out way :-).
I'm sorry I missed your contributions to the discussion a few weeks ago.
As I said up front, this is a test system. We're still trying a number
of different configurations, and are learning how best
>> This might be related to raid chunk positioning with respect
>> to LVM chunk positioning. If they interfere there indeed may
>> be some performance drop. Best to make sure that those chunks
>> are aligned together.
> Interesting. I'm seeing a 20% performance drop too, with default
> RAID and LV
>>> On Tue, 19 Feb 2008 14:25:28 -0500, "Norman Elton"
>>> <[EMAIL PROTECTED]> said:
[ ... ]
normelton> The box presents 48 drives, split across 6 SATA
normelton> controllers. So disks sda-sdh are on one controller,
normelton> etc. In our configuration, I run a RAID5 MD array for
normelton> each
Keld Jørn Simonsen <[EMAIL PROTECTED]> wrote:
> On Mon, Feb 18, 2008 at 09:51:15PM +1100, Neil Brown wrote:
>> Recovery after a failed drive would not be an easy operation, and I
>> cannot imagine it being even close to the raw speed of the device.
> I thought this was a problem with most raid type
