[olug] IO Performance

[jay swackhamer]

I know there are, but I was looking for some specifics, if anyone had an
experience tuning, and what, if anything had
a noticable impact.

On Thu, Sep 15, 2011 at 10:09 AM, George Neill <georgen at neillnet.com> wrote:

> 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
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