Proxmox on dell R200 and disk throughput

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netpalantir

New Member
Dec 18, 2008
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Hello,

I have installed Proxmox some months ago, and all is working well. Except that I get incredibly slow I/O. Within the VEs, I get up to 95% of I/O delays.
Inside the server there are just two VEs. One is an OpenVZ contained with backuppc (I/O intensive), the other is an almost always idle KVM Windows XP Pro.

pvepef gives the following (alarming) results:
Code: 
stormo:~# pveperf
CPU BOGOMIPS:      12005.17
REGEX/SECOND:      405108
HD SIZE:           94.49 GB (/dev/pve/root)
BUFFERED READS:    0.15 MB/sec
AVERAGE SEEK TIME: 60.67 ms
FSYNCS/SECOND:     95.78
DNS EXT:           239.60 ms
DNS INT:           0.90 ms
This is a brand new Dell R200 server, 2xSATA drives on RAID0. Quite cheap, but I really didn't expect it to be THIS slow!

Any hints??

Thanks
Palantir
 
Last edited:
# pveperf
CPU BOGOMIPS: 21338.89
REGEX/SECOND: 556185
HD SIZE: 94.49 GB (/dev/pve/root)
BUFFERED READS: 68.44 MB/sec
AVERAGE SEEK TIME: 12.81 ms
FSYNCS/SECOND: 147.87
DNS EXT: 12.70 ms
DNS INT: 1.21 ms (*.dyndns.org)


On my DELL R200.
model name : Intel(R) Xeon(R) CPU X3350 @ 2.66GHz
8GB ram.

//Coffe
 
coffe said:
# pveperf
CPU BOGOMIPS: 21338.89
REGEX/SECOND: 556185
HD SIZE: 94.49 GB (/dev/pve/root)
BUFFERED READS: 68.44 MB/sec
AVERAGE SEEK TIME: 12.81 ms
FSYNCS/SECOND: 147.87
DNS EXT: 12.70 ms
DNS INT: 1.21 ms (*.dyndns.org)


On my DELL R200.
model name : Intel(R) Xeon(R) CPU X3350 @ 2.66GHz
8GB ram.

//Coffe
Click to expand...

you have no raid controller with cache and BBU, therefore very bad FSYNCS/SECOND: 147.87
 
Hi tom, Tnx for the answer :D , i did more post my reply to the other guy needing help with his R200. But you are right, there is no raidcontroller in that one, we just run lo IO services on it.

//Coffe
 
I forgot about this thread (and changed workplace in the meanwhile), but thanks everyone for help, it turned out to be just a bad disk!

The problem was that the RAID controller did not detect anything wrong, and neither did any software diagnostics from within the OS. I downloaded the DELL bootable diagnostics, and finally found the problem with them. I replaced the disk and everything returned to normality.
 
We should have another topic / db form page - so that users can post their server specs and results of pveperf:

On our Gigabyte EP-45UD3L with 8GB DDR2 FSB 800 / SATA3 single 1.5 TB Seagate / Intel Core 2 Quad E9550 our results are:

Code: 
# pveperf
 
# pveperf
CPU BOGOMIPS:      22668.02
REGEX/SECOND:      700550
HD SIZE:           94.49 GB (/dev/pve/root)
BUFFERED READS:    69.19 MB/sec
AVERAGE SEEK TIME: 12.77 ms
FSYNCS/SECOND:     1233.59
DNS EXT:           256.54 ms
DNS INT:           630.15 ms (mydomain.com)
 
Last edited:
Yes.
Please fixa a "tool" so we can share spec/performance charts.

I have today 3 servers running.

//Coffe
 
I feel your pain. im new to the site i hope that there is a way we can get some relief.
 
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