Manuel Wolfshant wrote : > Can you please check that the drives are seen by the system via the SCSI > ( as opposed to older PATA ) protocol ? The BIOS must be configured to > avoid legacy/compatible mode by all means ( and use AHCI instead )
I'm guessing you're referring to a problem I've indeed seen on some similar hardware which had 82801I (ICH9 Family) and where the default I saw with RHEL5 was indeed to have the SATA drives appear as hda and hdc and resulted in very poor performance. That problem is solved by passing hda=noprobe and hdc=noprobe to the kernel. It's not what I'm seeing now, where both disks are sda and sdb, and the problem isn't that all disk transfers are slow, it's that I/O calls seem to stall very often for multiple seconds. Right now, the RAID-1 rebuild from sda2 to sdb2 is at 40MB/s sustained with all 8 CPUs (Quad HT) at 0.0% wait and a load of 1. This is what I would expect from an idle system. But moments ago, and for hours, it was nearly stalled with always at least 1 CPU at 90%+ wait and all of those I/O pauses for everything. I'm really confused, and still not even sure wether it's a hardware or software problem in the first place. Matthias -- Clean custom Red Hat Linux rpm packages : http://freshrpms.net/ Fedora release 14 (Laughlin) - Linux kernel 2.6.35.10-72.fc14.x86_64 Load : 0.06 0.03 0.07 _______________________________________________ rhelv6-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/rhelv6-list
