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I'm struggling with the <read> performance of the MFSYS25 while the <write> performance seems in line of what I'm expecting from our system.
I've set up a raid10 array out of 8 disks just for testing purposes and doing simple benchmarks with large file performance (next will come bonnie).
The problem I have is that write performance is around 270-290MB/sec while read performance is only 70-76MB/sec (i.e. slower than a single disk).
I'm testing with a simple:
# dd if=/mnt/shared/aaa of=/dev/zero conv=fsync
1653896+0 records in
1653896+0 records out
846794752 bytes (847 MB) copied, 15.659 seconds, 54.1 MB/s
Now... this is ridiculous and there must be something really bad going on.
The system is a MFSYS25, latest firmware (6.6) and configured as follows:
8xSeagate Constellation 2.5" 7200 SAS disks (model ST9500430SS, firmware 0003)
single virtual pool and single raid10 disk for testing purposes.
The server blade is a MFS5520VI with a single Xeon 5620 and 4GB ram (I'm focused on the disks atm).
I would really appreciate any hints.