[olug] IO Performance

[Kevin]

We'll need to know a lot more about the file access patterns, file
sizes, file systems, underlying hardware, and a whole lot of etcetera
to be able to answer this one. You might think of bringing in a
consultant for this. Specifically where you'd find such a consultant,
though, I don't know.

On Thu, Sep 15, 2011 at 10:25, jay swackhamer <reboottheuser at gmail.com> wrote:
> 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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