Deadly slow I/O

[netpalantir]

Hi all.
I have posted this before, but got no answer. So I'll try again. I have several servers with Proxmox (1.1) but one of them has problems with I/O. pveperf speaks for itself:

stormo:~# pveperf
CPU BOGOMIPS:      12005.20
REGEX/SECOND:      711591
HD SIZE:           94.49 GB (/dev/pve/root)
BUFFERED READS:    0.17 MB/sec
AVERAGE SEEK TIME: 8.97 ms
FSYNCS/SECOND:     131.31
DNS EXT:           87.20 ms
DNS INT:           0.82 ms (uff.netwise.it)

The buffered reads, in particular, are deadly low!!!

This is a new Dell R200, with SAS6/i RAID controller, setup as RAID0 spanning over 2 SATA disks. Anyone has ANY idea on where to look?

Don't know whether this is irrelevant, but look also at this output:

stormo:~# hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   8970 MB in  2.00 seconds = 4489.36 MB/sec
 Timing buffered disk reads:  652 MB in  3.00 seconds = 217.04 MB/sec

stormo:~# hdparm -tT /dev/mapper/pve-data

/dev/mapper/pve-data:
 Timing cached reads:   9194 MB in  2.00 seconds = 4601.48 MB/sec
 Timing buffered disk reads:  596 MB in  3.03 seconds = 196.91 MB/sec

stormo:~# hdparm -tT /dev/mapper/pve-root

/dev/mapper/pve-root:
read(2097152) returned 1863680 bytes
 Timing buffered disk reads:  read() failed: Input/output error
stormo:~#

But all of those devices reside on the SAME logical RAID disk...

Any help appreciated.

Palantir

 

[tom]

input/output error - hardware defect? (disk or raid controller)

 

[netpalantir]

You were right, one of the disks was gone. Now I am getting values around 200MB/sec. The annoying thing was that the controller didn't detect it. I donwloaded the DELL diagnostics live CD and performed various tests until I got an error on the drive, then I replaced it.