Mark Hahn wrote:
15 drives and 64K chunks gives 960K per stripe.
The raid0 code should set the read-ahead to twice that: 1920K
which I would have thought would be enough, but apparently not.
choosing the RA size should depend in some way on speed, shouldn't it?
after all, the goal is to have
15 drives and 64K chunks gives 960K per stripe.
The raid0 code should set the read-ahead to twice that: 1920K
which I would have thought would be enough, but apparently not.
choosing the RA size should depend in some way on speed, shouldn't it?
after all, the goal is to have enough reads queued
Mark Hahn wrote:
15 drives and 64K chunks gives 960K per stripe.
The raid0 code should set the read-ahead to twice that: 1920K
which I would have thought would be enough, but apparently not.
choosing the RA size should depend in some way on speed, shouldn't it?
after all, the goal is to have
Hi!
I am currently testing 3ware raid cards. Now i have 15 disks, and on these
a swraid0. The write speed seems good (700 MBps), but the read performance
only 350 MBps. Another problem when i try to read with two process, then
the _sum_ of the read speeds fall back to 200 MBps. So there is a
On Tue, 13 Mar 2007, Tomka Gergely wrote:
Hi!
I am currently testing 3ware raid cards. Now i have 15 disks, and on these
a swraid0. The write speed seems good (700 MBps), but the read performance
only 350 MBps. Another problem when i try to read with two process, then
the _sum_ of the read
On Tue, 13 Mar 2007, Justin Piszcz wrote:
Have you tried increasing your readahead values for the md device?
Yes. No real change. According to my humble mental image, readahead not a
too useful thing, when we read 1-4 thread with sdd. The io subsystem
already reading with the possible maximum
On Tue, 13 Mar 2007, Tomka Gergely wrote:
On Tue, 13 Mar 2007, Justin Piszcz wrote:
Have you tried increasing your readahead values for the md device?
Yes. No real change. According to my humble mental image, readahead not a
too useful thing, when we read 1-4 thread with sdd. The io
Nice.
On Tue, 13 Mar 2007, Tomka Gergely wrote:
On Tue, 13 Mar 2007, Tomka Gergely wrote:
On Tue, 13 Mar 2007, Justin Piszcz wrote:
Have you tried increasing your readahead values for the md device?
Yes. No real change. According to my humble mental image, readahead not a
too useful
On Tuesday March 13, [EMAIL PROTECTED] wrote:
On Tue, 13 Mar 2007, Tomka Gergely wrote:
On Tue, 13 Mar 2007, Justin Piszcz wrote:
Have you tried increasing your readahead values for the md device?
Yes. No real change. According to my humble mental image, readahead not a
too
On Wed, 14 Mar 2007, Neil Brown wrote:
On Tuesday March 13, [EMAIL PROTECTED] wrote:
On Tue, 13 Mar 2007, Tomka Gergely wrote:
On Tue, 13 Mar 2007, Justin Piszcz wrote:
Have you tried increasing your readahead values for the md device?
Yes. No real change. According to my
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