more below...
On Nov 25, 2009, at 7:10 AM, Paul Kraus wrote:
I posted baseline stats at http://www.ilk.org/~ppk/Geek/
baseline test was 1 thread, 3 GiB file, 64KiB to 512 KiB record size
480-3511-baseline.xls is an iozone output file
iostat-baseline.txt is the iostat output for the device in
more below...
On Nov 25, 2009, at 5:54 AM, Paul Kraus wrote:
Richard,
First, thank you for the detailed reply ... (comments in line
below)
On Tue, Nov 24, 2009 at 6:31 PM, Richard Elling
wrote:
more below...
On Nov 24, 2009, at 9:29 AM, Paul Kraus wrote:
On Tue, Nov 24, 2009 at
On Wed, Nov 25, 2009 at 7:54 AM, Paul Kraus wrote:
>> You're peaking at 658 256KB random IOPS for the 3511, or ~66
>> IOPS per drive. Since ZFS will max out at 128KB per I/O, the disks
>> see something more than 66 IOPS each. The IOPS data from
>> iostat would be a better metric to observe than
If you are using (3) 3511's, then won't it be possibly that your 3GB workload
will be largely or entirely served out of RAID controller cache?
Also, I had a question for your production backups (millions of small files),
do you have atime=off set for the filesystems? That might be helpful.
--
I posted baseline stats at http://www.ilk.org/~ppk/Geek/
baseline test was 1 thread, 3 GiB file, 64KiB to 512 KiB record size
480-3511-baseline.xls is an iozone output file
iostat-baseline.txt is the iostat output for the device in use (annotated)
I also noted an odd behavior yesterady and have
Richard,
First, thank you for the detailed reply ... (comments in line below)
On Tue, Nov 24, 2009 at 6:31 PM, Richard Elling
wrote:
> more below...
>
> On Nov 24, 2009, at 9:29 AM, Paul Kraus wrote:
>
>> On Tue, Nov 24, 2009 at 11:03 AM, Richard Elling
>> wrote:
>>
>>> Try disabling pre
more below...
On Nov 24, 2009, at 9:29 AM, Paul Kraus wrote:
On Tue, Nov 24, 2009 at 11:03 AM, Richard Elling
wrote:
Try disabling prefetch.
Just tried it... no change in random read (still 17-18 MB/sec for a
single thread), but sequential read performance dropped from about 200
MB/sec. to
On Tue, 24 Nov 2009, Paul Kraus wrote:
On Tue, Nov 24, 2009 at 11:03 AM, Richard Elling
wrote:
Try disabling prefetch.
Just tried it... no change in random read (still 17-18 MB/sec for a
single thread), but sequential read performance dropped from about 200
MB/sec. to 100 MB/sec. (as expect
On Tue, Nov 24, 2009 at 11:03 AM, Richard Elling
wrote:
> Try disabling prefetch.
Just tried it... no change in random read (still 17-18 MB/sec for a
single thread), but sequential read performance dropped from about 200
MB/sec. to 100 MB/sec. (as expected). Test case is a 3 GB file
accessed in
Try disabling prefetch.
-- richard
On Nov 24, 2009, at 6:45 AM, Paul Kraus wrote:
I know there have been a bunch of discussion of various ZFS
performance issues, but I did not see anything specifically on this.
In testing a new configuration of an SE-3511 (SATA) array, I ran into
an int
I know there have been a bunch of discussion of various ZFS
performance issues, but I did not see anything specifically on this.
In testing a new configuration of an SE-3511 (SATA) array, I ran into
an interesting ZFS performance issue. I do not believe that this is
creating a major issue f
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