Hi list,
I'm running FreeBSD 8.0-RELEASE-p1 on a Dell R300 which has a ICH9 SATA
controller on-board (do not have the RAID controller).
The system has 2 disks in a gmirror setup. Every now and then, probably
under some load, one of the disks gets read or write timeouts like:
May 5 03:01:37 aberdeen kernel: ad4: timeout waiting to issue command
May 5 03:01:37 aberdeen kernel: ad4: error issuing WRITE_DMA48 command
May 5 03:01:37 aberdeen kernel: GEOM_MIRROR: Request failed (error=5).
ad4[WRITE(offset=200404975104, length=16384)]
May 5 03:01:37 aberdeen kernel: GEOM_MIRROR: Device gm0: provider ad4
disconnected.
or:
May 13 14:41:26 aberdeen kernel: ad6: TIMEOUT - READ_DMA48 retrying (1
retry left) LBA=975513887
Sometimes the read/write succeeds after a few retries, but sometimes it
does not, so geom_mirror throws the disk out of the mirror.
Tonight ad6 was thrown out of the mirror and ad4 then gave actual read
errors, resulting in a big mess :(
My question: does anyone have experience with FreeBSD on a Dell R300 or
can anyone give me some help in trying to fix the timeouts?
I was told using AHCI could be better for SATA disks, but apparently
(http://permalink.gmane.org/gmane.linux.kernel.pci/8267) the BIOS does
not support turning that on, so that does not appear to be an option.
Thanks,
Pieter
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