binarydrive
04-06-2013, 12:11 PM
We just got done finished setting up our new server, with a fairly high end array and were really put off by the results we got for reads/writes. First off, here is some specs:
2 x E5-2620's w/ SM board
8 x 2TB in Raid-10 for the main storage
2 x 120GB SSD in Raid-1 for ssd caching (cachecade)
LSI 9271-8iCC (with LSI recommended settings)
Here is what we are getting for read speeds:
/dev/sdb:
Timing cached reads: 16740 MB in 1.98 seconds = 8436.40 MB/sec
Timing buffered disk reads: 1338 MB in 3.00 seconds = 445.70 MB/sec
We are using the latest firmware, drivers and its the same on CentOS 6's 2.6.32 or mainline 3.8.xx
If I compare this to another one of our servers (Adaptec 5805Z, 6x WD RE4 1TB):
/dev/sda:
Timing cached reads: 25604 MB in 2.00 seconds = 12816.07 MB/sec
Timing buffered disk reads: 2136 MB in 3.00 seconds = 711.98 MB/sec
With more disks, faster memory and twice the amount I would expect higher figures.
Any ideas why we are getting such slow speeds?
2 x E5-2620's w/ SM board
8 x 2TB in Raid-10 for the main storage
2 x 120GB SSD in Raid-1 for ssd caching (cachecade)
LSI 9271-8iCC (with LSI recommended settings)
Here is what we are getting for read speeds:
/dev/sdb:
Timing cached reads: 16740 MB in 1.98 seconds = 8436.40 MB/sec
Timing buffered disk reads: 1338 MB in 3.00 seconds = 445.70 MB/sec
We are using the latest firmware, drivers and its the same on CentOS 6's 2.6.32 or mainline 3.8.xx
If I compare this to another one of our servers (Adaptec 5805Z, 6x WD RE4 1TB):
/dev/sda:
Timing cached reads: 25604 MB in 2.00 seconds = 12816.07 MB/sec
Timing buffered disk reads: 2136 MB in 3.00 seconds = 711.98 MB/sec
With more disks, faster memory and twice the amount I would expect higher figures.
Any ideas why we are getting such slow speeds?