Author Topic: VM Access very slow for VMs stored on TeraStation  (Read 1262 times)

ronl064

  • Calf
  • *
  • Posts: 1
VM Access very slow for VMs stored on TeraStation
« on: August 21, 2009, 02:52:33 pm »
   

I have an ESX 3.5 box with a Terastation (TS-RIGL/R5, FW 1.01 2TB iSCSI configured as RAID5).  The connection is iSCSI.  I have found that any VMs that I store on the Terastation drive are VERY slow to start up, shut down, or suspend.  There is some difference in the performance of the VM but it is not as noticable as the control performance.  The iSCSI is directly connected to the host on a 1GB NIC, so there is no interfering net traffic.

 

Can anyone tell me why the performance is slow and if I can fix it?

TIA

Ron L.

 


rinthos

  • Buffalo
  • ***
  • Posts: 223
Re: VM Access very slow for VMs stored on TeraStation
« Reply #1 on: August 22, 2009, 01:46:27 am »
   

Assuming you're running virtual-center, can you compare disk I/O during those times vs. others?

Are you allocating iSCSI LUNs direct to each VM, or to ESX and creating VMDK's out of them?

 

Do you have any SCSI reservation errors in your ESX syslog?

---