[olug] IO Performance

[George Neill]

Jay,

The file system you choose and the way you disk is laid out can have a
huge impact as well.

There are many file system tunables you cam mess around with.

Later
George

On 9/15/11, jay swackhamer <reboottheuser at gmail.com> wrote:
> It appears that a code-level on the IBM XIV disk array that relates to
> replication has more to do with IO performance than Linux Tuning.
>
> Now we are running batch schedules through Oracle faster than previously, so
> there was some benefit, and now I can tweak/tune these some more,
> to get to the best numbers for the workload.
>
> On the road to this discovery, I found these parameters related to IO
> performance.
>
> Does anyone else have any IO related tuning tips?
>
> echo 10 > /proc/sys/vm/swappiness
> echo 1024 > /proc/sys/vm/min_free_kbytes
> sysctl -w vm.pagecache="1 10 30"
> echo 192 > /sys/module/qla2xxx/parameters/ql2xmaxqdepth
> multipath -ll > /tmp/multipath.txt
> for i in `grep sd /tmp/multipath.txt | awk ' { print $3 } '`
> do
>     echo 192 > /sys/block/$i/device/queue_depth
>     echo 384 > /sys/block/$i/queue/nr_requests
>     echo 512 > /sys/block/$i/queue/read_ahead_kb
>     echo deadline > /sys/block/$i/queue/scheduler
> done
>
> for i in `mount | grep vg | awk ' { print $1 } '`
> do
>     mount -o remount,noatime,async $i
> done
> _______________________________________________
> OLUG mailing list
> OLUG at olug.org
> https://lists.olug.org/mailman/listinfo/olug
>