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Performance using MSA1500cs with MSA20 in ADG configuration.

 
Ingemar Fällman
Occasional Visitor

Performance using MSA1500cs with MSA20 in ADG configuration.

Hi

What is the minimum and maximum write and read performance I should get from a raid 6 configuration?

In our configuration we get about 49Mb/s peak performance and about 30Mb/s in average.

Show tech_support output is attached.

The server is connected via fibre channel, and the fibre channel switch is only used for this server.

Server information:

Model: ProLiant DL380 G4
Serial numer: GB86111KLN
OS: Redhat / Red Hat Enterprise Linux AS release 4 (Nahant Update 5) / #1 SMP Fri Apr 20 17:03:35 EDT 2007
Fibre Channel: QLogic Corp. ISP2312-based 2Gb Fibre Channel to PCI-X HBA

Units are created using:

add unit 0 raid_level=ADG stripe_size=64 size=1572GB data="Disk101-Disk111"
add unit 1 raid_level=ADG stripe_size=64 size=1572GB data="Disk101-Disk111"
add unit 2 raid_level=ADG stripe_size=64 size=1572GB data="Disk101-Disk111"
add unit 3 raid_level=ADG stripe_size=64 size=1609159MB data="Disk101-Disk111"
add spare unit=0 "Disk112"

Filesystems are created with:

mkfs.ext3 -b 4096 -T largefile4 -m 0 -O sparse_super -O dir_index -R stride=16 -j -J size=400 /dev/sdm1
tune2fs -i 0 -c 0 /dev/sdm1
mkfs.ext3 -b 4096 -T largefile4 -m 0 -O sparse_super -O dir_index -R stride=16 -j -J size=400 /dev/sdn1
tune2fs -i 0 -c 0 /dev/sdn1
mkfs.ext3 -b 4096 -T largefile4 -m 0 -O sparse_super -O dir_index -R stride=16 -j -J size=400 /dev/sdo1
tune2fs -i 0 -c 0 /dev/sdo1
mkfs.ext3 -b 4096 -T largefile4 -m 0 -O sparse_super -O dir_index -R stride=16 -j -J size=400 /dev/sdp1
tune2fs -i 0 -c 0 /dev/sdp1


We performed the benchmark using dd, with direct file write to prevent write cache in Linux.

# cat /home/bigfile00 > /dev/null; sync; /bin/nice -n -10 /home/dd if=/home/bigfile00 of=/fc/unit200/fot/bigfile02 oflag=direct bs=1024k; sync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 24.4965 seconds, 43.8 MB/s
2 REPLIES 2
Ingemar Fällman
Occasional Visitor

Re: Performance using MSA1500cs with MSA20 in ADG configuration.

Did not realize that this was a public forum, can a moderatior please remove the serialnumber from my post.
Megan Moore
Occasional Advisor

Re: Performance using MSA1500cs with MSA20 in ADG configuration.

How and why are you specifing the stride size?

I though you may have an alignment problem.