Messages in this thread | | | Date | Thu, 10 Jul 2008 15:41:46 +0200 | From | Martin Lucina <> | Subject | Re: Higher than expected disk write(2) latency |
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chris.mason@oracle.com said: > Is NCQ enabled on the drive? The basic way to fix this is to have > multiple requests in flight, which isn't going to happen on sata with > the cache off and with ncq off.
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata1.00: ATA-7: Hitachi HDS721616PLA380, P22OAB3A, max UDMA/133 ata1.00: 321672960 sectors, multi 0: LBA48 NCQ (depth 31/32) ata1.00: configured for UDMA/133
I'm assuming the above indicates NCQ is enabled.
We'll try running the tests tomorrow with different i/o schedulers and report back.
-mato
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