On Tue, 13 Jun 2006, Justin Piszcz wrote:
> mkfs -t xfs -f -d su=128k,sw=14 /dev/md9
>
> Gordon, What speed do you get on your RAID, read and write?
>
> When I made my XFS/RAID-5, I accepted the defaults for the XFS filesystem
> but used a 512kb stripe. I get 80-90MB/s reads and ~39MB/s writes.
>
> On 5 x 400GB ATA/100 Seagates (on a regular PCI bus, max, 133mb/s)
Standard Bonnie (which I find to be a crude, but reasonable test of overal
throughput of a device - server has 1G of RAM)
zem:/mounts/pdrive# bonnie -n0 -f -g0 -u0
Using uid:0, gid:0.
Writing intelligently...done
Rewriting...done
Reading intelligently...done
start 'em...done...done...done...
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
zem 2G 195984 59 68699 31 217398 52 1028
3
zem,2G,,,195984,59,68699,31,,,217398,52,1028.3,3,,,,,,,,,,,,,
Other tests:
zem:/mounts/pdrive# hdparm -T /dev/md9
/dev/md9:
Timing cached reads: 3592 MB in 2.00 seconds = 1797.08 MB/sec
zem:/mounts/pdrive# hdparm -t /dev/sda /dev/md9
/dev/sda:
Timing buffered disk reads: 228 MB in 3.01 seconds = 75.87 MB/sec
/dev/md9:
Timing buffered disk reads: 242 MB in 3.02 seconds = 80.14 MB/sec
The server is some Dell 1U box with a single P4/HT processor and 1G of
RAM. It has twin internal SCSI drives on a Fusion MPT driver, drives are
using Linux s/w RAID-1, of course, and it has 2 external SCSI connectors
(dual Adaptec controller) going to some big Dell 14-drive chasis with 7
drives on each chain. I've not actually seen this box - I did the entire
build remote with the aid of someone in-front of the box who loaded Debian
on it under my instructions, until I could SSH into it and complete the
process, and did the neccessary BIOS fiddling to make sure it would boot
off the internal drives - it's in Califronia, US I'm in Devon, UK...
Gordon
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