On 00:21, H. Peter Anvin wrote:
I have just updated the paper at:
http://www.kernel.org/pub/linux/kernel/people/hpa/raid6.pdf
... with this information (in slightly different notation and with a bit
more detail.)
There's a typo in the new section:
s/By assumption, X_z != D_n/By
Hi,
I'm happily using MD on one of our fileservers.
This fileserver is basically a Dell PowerEdge 2650 loaded with 5x300GB HDDs.
A 1TB Raid5 partition is defined over the 5 disks
md1 : active raid5 sdb3[5] sde3[4] sdd3[3] sdc3[2] sda3[0]
1170238464 blocks level 5, 64k chunk, algorithm 2
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
Andre Noll wrote:
On 00:21, H. Peter Anvin wrote:
I have just updated the paper at:
http://www.kernel.org/pub/linux/kernel/people/hpa/raid6.pdf
... with this information (in slightly different notation and with a bit
more detail.)
There's a typo in the new section:
s/By assumption, X_z !=
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