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Poor writing performanc on HBA QLogic 2312, Proliant 585 G1

 
MarcinG
Occasional Visitor

Poor writing performanc on HBA QLogic 2312, Proliant 585 G1

I'm getting poor writing performance from QLogic 2312 HBA (2 Gb/s), Proliant DL 585 G1 with Linux SLES 10 SP1 x86.
Array: IBM DS 4800 with RAID1

# time dd oflag=direct if=/dev/zero bs=8k count=20000 of=/dev/sdb
1318+0 records in
1318+0 records out
10797056 bytes (11 MB) copied, 5.39081 seconds, 2.0 MB/s

Any solutions?