TS-809u-rp Slow access to VM's w/ Xenserver

[slawson]

It seems like all my Virtual machines are extremely laggy. Using Diskbench, create file batch test, I am getting speeds of .48MB/s to .9MB/s...

If i load the VM's on the local disk of the server, i can get anywhere from 17.64MB/s to 56MB/s

Both the Xenserver and QNAP 809 are connected to the same gigabit switch.

anyone have suggestions or experience with this?

[bjoand]

I'm also interested about this...
I have just bought three TS-809u-rp (have installed two of them, one is still in the box). We are going to use them as iSCSI-targets for our Provisioneingservers to provision XenApp servers in XenServer.
(the cache disks is then placed on a EMC SAN with FC-disks)

Is your setup similar to this or are you useing the TS-809u to store the server image-files and run from the TS-809u box directly?

[slawson]

We are using two raid 5 arrays of 4 drives, array 1 contains company user documents and the ISO repository, array 2 contains nothings but the iscsi. Both ethernet ports are connected to the same gigabit switch that the server is on.

if you manage to find any settings that help, please let me know.

As of right now I'm kind of upset with the 2500 dollar investment, and lack luster support.

[asta]

I did a test into one of my virtual machines (2008 R2 server) running in Xenserver 5.5 on the TS-809u-rp
These are my results:
Starting Batch Create File Bench...

48 MB; d:\test; 50331648 bytes; 312 ms; 153,846 MB/s
52 MB; d:\test; 54525952 bytes; 281 ms; 185,053 MB/s
56 MB; d:\test; 58720256 bytes; 328 ms; 170,732 MB/s
60 MB; d:\test; 62914560 bytes; 312 ms; 192,308 MB/s
64 MB; d:\test; 67108864 bytes; 359 ms; 178,273 MB/s
68 MB; d:\test; 71303168 bytes; 390 ms; 174,359 MB/s
72 MB; d:\test; 75497472 bytes; 406 ms; 177,340 MB/s
76 MB; d:\test; 79691776 bytes; 421 ms; 180,523 MB/s
80 MB; d:\test; 83886080 bytes; 452 ms; 176,991 MB/s
84 MB; d:\test; 88080384 bytes; 468 ms; 179,487 MB/s

Create Batch File Bench ended

This is my setup:

1. 1 gigabit switch HP Procurve 2810G 24
2. 2 XenServers 5.5 which both has 1 double ports HBA card for the ISCSI connection.
3. Multipathing is used on Xenserver.
4. Qnap has a Raid 5 setup with 8, 2TB Hitachi drives including 1 hot spare (7 drives in use).
5. The Qnap is connected with both nics to the switch and is configured in a trunk (IEEE.802.3ad).

I disabled all unused services and applications on the qnap, only web filemanager/NFS and ISCSI are used.

I hope this will help you.