On 02/09/2011 11:47 AM, Matthias Saou wrote:
Hi,I just got this isolated RHEL6 server, with hardware I've never used before. It's a Supermicro X8STi motherboard (Xeon i7 920) with two cheap SATA disks (WD10EADS-00P8B0) using software RAID-1. The system is unusable : A quick strace of various processes shows very long waits during many different I/O related calls such as open, read, pread, stat, fdatasync... I've tried failing every other partition in order to be sure to use only one disk for a while, with the same results. Running RAID rebuilds sometimes peaks at 60-100MB/s but very rarely. Right now for instance, the main 900GB RAID-1 is rebuilding from sda2 to sdb2 and it's reporting 400kB/s with system load of over 2 (the server is idle apart from this rebuild). While this is going on, even smartctl on sdb takes time to respond. When no rebuild is in progress, the problems are the same. I'm using the latest released 2.6.32-71.14.1.el6.x86_64 kernel, and here is the detail of the SATA controller(s) : 00:1f.2 IDE interface: Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1 Subsystem: Super Micro Computer Inc Device 0009 Kernel driver in use: ata_piix Kernel modules: ata_generic, pata_acpi, ata_piix 00:1f.5 IDE interface: Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2 Subsystem: Super Micro Computer Inc Device 0009 Kernel driver in use: ata_piix Kernel modules: ata_generic, pata_acpi, ata_piix
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 )
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