On Thu, 24 Apr 2008, Eric Sandeen wrote:
Michael Darling wrote:
Eric, for the numbers you provided, are you using a single drive,
software raid, or hardware raid? If a hardware raid, is it a 3ware card?
it's a simple partition on a sata drive.
I hadn't seen the nobarrier mount option before. Using that changes
sequential creates from about 190/second to about 2500/second, and
changes sequential deletes from about 170/second to about 3700/second.
I wasn't recommending, necessarily, that you use it, but was just
looking for bottlenecks...
I don't yet have a BBU for the 3ware card, but would certainly get one
if we go with the 3ware card before we start putting real data on the
raid. Am I right that with a BBU unit and a battery backup for the
server as a whole, that nobarrier would be safe to use?
Not using nobarrier, but using logbsize 256k changes sequential creates
from about 190/second to about 270/second. So, it's an improvement, but
no where near where a software raid performs (1600/second) or where the
hardware raid performs with nobarrier.
Default mkfs & mount w/ 256k logbufs:
xfs,256k logbuf: 1353/s
On Thu, Apr 24, 2008 at 1:33 AM, David Chinner <dgc@xxxxxxx
> So I played with this a little on 2.6.25, on plain partitions.
> I saw similar numbers; for example, sequential creates:
> ext3: 23698/s
> xfs: 319/s
> xfs,nobarrier: 4478/s
And with logbsize=256k?
Which program is this that you are using to measure this, bonnie++, or?