Mike,
You didn't tell us is your app is multithreaded/multiprocess and if each
thread does it's own I/O. I suspect you will not see much improvements
if this is a single thread app.
Stefan Hinker wrote:
Mike,
This sounds like your application is doing many many small IOs. In
such a case, the performance metric you should look at isn't MB/sec,
but IOPS (IOs per second). As in any other hypervisor solution,
virtual IO will see some additional latency for every IO you do. If
your IOs are small, this will quickly add up to a significant delay.
To counter this effect, you can configure multiple vdisks for your
LDom guest, and stripe over these vdisks in the guest, for example by
creating a RAID 0 zpool within the LDom. This will allow for parallel
operation of all configured vdisks, speeding up the overall virtual IO
subsystem significantly.
I would recommend you configure 8 vdisks per LDom, and create a pool
similar to this:
zpool create guestpool c0d1s2 c0d2s2 c0d3s2 c0d4s2 c0d5s2 c0d6s2
c0d7s2 c0d8s2
In addition, I recommend that your control domain is configured with
at least 4 vCPUs and 1GB of RAM.
I'm sure your EMC admin can create smaller LUNs, if space is an issue.
hth
stefan
On 09.09.10 19:20, Mike DeMarco wrote:
Running LDOM software 1.3 on a T5220 with LP11000 HBAs connected to EMC storage
array. Disk are under mpxio on the control domain and are presented to each
LDOM through a VDS for that LDOM. We have a application running inside the LDOM
that access filesystems with over 60,000 files in them. The application reads
through the xml files at 256 bytes per read and is accessing over 50meg a
second in reads. I have the same filesystem running on a V880 using vxfs and
the LDOM access is over 8 times slower than the veritas.
LDOM is conifugred with 16 vcpu and 16Gbytes ram. Filesystem on LDOM is zfs.
Is there any performance tuning that I can do to the LDOM configuration to get
it to perform more closely to the V880 performance?
TIA
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