Date: Fri, 14 May 2010 19:42:33 +0200 From: Pieter de Boer <pieter@os3.nl> To: freebsd-stable@freebsd.org Subject: Read / write timeouts on SATA disks connected to ICH9 Message-ID: <4BED8B89.6010901@os3.nl>
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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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