Can you characterize the performance of the system?
Does the application do a lot of SYNC writes?
Lots of small reads?
Lots of seeks?
There are a bunch of tools available for looking at interesting ZFS
sorts of things.
I'd highly recommend Richard Ellings zilstat script. It'll help to show
you if you are backing up on a lot of SYNC writes to the ZIL.
IIRC, (and I don't trust my memory these days) just about everything
that's written down to the IO domain is treated as SYNC and if all you
have is a couple of disks backing it, that might throttle you to about
300 write IOPS (or 600 at best with a stripe) and if your IO's are tiny,
then your bandwidth will be tiny.
I'd suggest that it would be a good idea to run some of the DTrace
toolkit scripts such as iosnoop and iotop to get a feel for the size and
number of IO's your webserver is giving you.
I can tell you that a well configured T-series is an ideal WEB platform
- though I more frequently use containers than LDOMS when it comes to
workloads that are short-sharp in and out style apps. (Any v11n layer
can add to latency for individual transactions... Containers are the
thinnest. :)
Let us know what you turn up - and for the fun of the exercise, (and to
allow you to rule in or out the ZFS component), try giving the LDOM a
raw slice and see how things go.
Cheers!
Nathan.
Tony MacDoodle wrote:
T5140's, LDom 1.3, Solaris 10 u8, ZFS for both backend (RAID 10,
internal 146G 10K rpm) and rpool...... Horrible performance for a web
server.... We are thinking on not using the product............
On Wed, Apr 28, 2010 at 6:24 PM, John <[email protected]
<mailto:[email protected]>> wrote:
We're seeing similar performance problems as well. What are the
details of your configuration, ie what kind of disk's, what storage
array, etc
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