From: Ubaidul Khan (ukhanlists@hotmail.com)
Date: Thu Feb 22 2007 - 23:46:29 EST
Hello,
I have a Sun StorEdge 3320 RAID array(2 Controllers) hooked up to a SUN
X4200(16Gb RAM, 2 Dual Core 2592.663 MHz Opteron) . The x4200 is running
Red Hat Enterprise Linux 4 U4. I have a RAID5 logical drive on the array
with the following parameters:
LD LD-ID Size Assigned Type Disks Spare Failed
Status
-------------------------------------------------------------------------------------------------------
ld0 610FECCE 545.91GB Primary RAID5 5 1 0
Good
Write-Policy Write-Back
StripeSize 16KB
Following are the drives in the array:
sccli> show disks
Ch Id Size Speed LD Status IDs Rev
----------------------------------------------------------------------------
0 0 136.73GB 320MB ld0 ONLINE SEAGATE ST314670LSUN146G 045A
S/N 0843P4WH
0 1 136.73GB 320MB ld0 ONLINE SEAGATE ST314670LSUN146G 045A
S/N 0843RK2Z
0 2 136.73GB 320MB ld0 ONLINE SEAGATE ST314670LSUN146G 045A
S/N 0843PPLT
0 3 136.73GB 320MB ld0 ONLINE SEAGATE ST314670LSUN146G 045A
S/N 0643KKD7
0 4 136.73GB 320MB ld0 ONLINE SEAGATE ST314670LSUN146G 045A
S/N 0643KR03
0 5 136.73GB 320MB GLOBAL STAND-BY SEAGATE ST314670LSUN146G 045A
S/N 0643FHZ6
2 0 136.73GB 320MB NONE FRMT SEAGATE ST314670LSUN146G 045A
S/N 0643K31Y
2 1 136.73GB 320MB NONE FRMT SEAGATE ST314670LSUN146G 045A
S/N 0843RFAN
2 2 136.73GB 320MB NONE FRMT SEAGATE ST314670LSUN146G 045A
S/N 0643M141
2 3 136.73GB 320MB NONE FRMT SEAGATE ST314670LSUN146G 045A
S/N 0643M0FB
2 4 136.73GB 320MB NONE FRMT SEAGATE ST314670LSUN146G 045A
S/N 0843PNS2
2 5 136.73GB 320MB NONE FRMT SEAGATE ST314670LSUN146G 045A
S/N 0643LG0P
The array is setup in a split loop configuration, with the following SCSI
HBAs:
LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI
(rev 08)
LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI
(rev 08)
I wanted to do some benchmarking on the array and here is what I got:
Writing directly to the block device(/dev/sda1) with dd = 83 MBytes/Second.
This transfer rate is an average of three runs. I did the following:
dd bs=2M count=10000 if=/dev/zero of=/dev/sda1
Time elapsed to write = 240 Seconds (Average of 3 runs)
I was expecting to get at least 160Mb/Sec out of this array. Am I losing
the performance due to RAID5? Transfer rate on a ext3 file system is
slightly worse:
53 MBytes/Second
Here is the ext3 specs:
Block Size is 2048
Bytes/Inode is 4096
Please feel free to let me know what you think and how I can get better
performance out of the array. Thanks
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