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3 Replies Last post: Jun 22, 2009 10:01 AM by patparks1  

Slow file system performance on ESXi 3.5 using HP DL360G5 all local disk posted: Jun 19, 2009 2:51 PM

Click to view patparks1's profile Novice 23 posts since
Jun 16, 2009

I've got 3 servers in my environment running ESXi version 3.5.0 (163429). The hardware is the same on all 3 machines. In this environment we have NO san storage space, all local disk

Servers: HP DL 360/Gen 5's, Dual Quad Core CPU's, 20GB of RAM

Datastore 1: 2 x 300GB 10K rpm 2.5 SAS drives in a RAID 1 mirror,

Datastore 2: 4 x 300GB 10K rpm 2.5 SAS drives in a RAID 5 mirror,

As a test, I created a virtual machine running CentOS linux5.3 and gave it a 2GB hard drive. I installed CentOS on the drive. This virtual machine lives in datastore1.

Now, I go into the VMWare Infrastructure client, go into the datastore browser and I copy the file into a subfolder on datastore1 called backups. The file is 2,097,152.00KB and it took 3 minutes and 42 seconds to copy. That equates to about 9MB/sec. Which to me, seems terribly slow.

As a side test, using VMWare Server 2.0 which is installed on my Dell laptop, I created a 2GB file for a VM and copied it under Windows Vista using Windows explorer in 1 minute and 43 seconds. So, that is 2x as fast on a slow laptop drive.

As far as I can tell, the actual performance of the virtual machines themselves is just fine. Nobody is complaining, they load fast and seem to be working great. It's just painful to make an image and then copy it from one folder to another to setup another machine.

Any suggestions on how to improve these speeds, or is this just the way it is?


Click to view J1mbo's profile Expert 565 posts since
May 20, 2009

You should be able to check the BBWC status from Insight Manager or possibly the VMware console itself, if you're using the HP embedded version that is.

Also on the "slow management network" thread it is noted that 10MB/s seems to be a programatic limit perhaps to preserve the performance of running machines? What is the guest performance?

Finally, unless there is specific reason for the seperate mirror, most likely the overall IOPS rate would be improved by moving all the disks into the RAID 5 volume, since contention would be set against more spindles.

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