Messages in this thread | | | Subject | RE: High CPU usage (up to server hang) under heavy I/O load | From | Tom Sightler <> | Date | Fri, 13 Aug 2004 23:39:09 -0400 |
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On Fri, 2004-08-13 at 11:46, Sylvain COUTANT wrote: > Hello Matt, > > > Which server please? > > PE 2600 manufactured in June with latest PC BIOS and SCSI (PERC4/DI) > BIOS/Firmware. We also tried downgrading to the previous release (as we have > another PE2600 which runs fine with them) but it didn't do.
What driver are you using for the PERC? We have a Dell 1750 with a PERC/4Di which uses the megaraid driver under RHEL 3 and it has this same problem, but only when writing to drives connected to PERC controller. The system also has a Qlogic 2312 card connected to a EMC CX400 storage controller and performance to this device is fine, even if I setup and LUN on a single ATA disk.
During heavy writes to the drives attached to the PERC4/Di the system becomes practically unusable. I've been wanting to try the 'megaraid2' driver to see if this gets rid of the issue but I haven't been able to try that yet.
We have some older systems with PERC2/DC cards which also use the 'megaraid' driver but they don't seem to experience this issue so I'm a little suspicious that perhaps this driver simply doesn't work that well with the newer megaraid-like controllers.
Later, Tom
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