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Subject: strange ata-hdd error
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I get these errors after 2-7days of uptime:

Jun 30 14:04:58 mutka kernel: ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=3012159
Jun 30 15:40:26 mutka kernel: ad0: FAILURE - WRITE_DMA status=51<READY,DSC,ERROR> error=4<ABORTED> LBA=3011071
Jun 30 15:40:31 mutka kernel: ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=3011199

and then something like: 'removing ad0 from configuration' and I'm forced to reboot

and here are some older errors, these don't occur anymore though:

Feb  7 00:19:26 mutka kernel: ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=3592687
Feb  7 00:19:27 mutka kernel: ad0: WARNING - READ_DMA UDMA ICRC error (retrying request) LBA=3592687
Feb  7 00:19:27 mutka kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=84<ICRC,ABORTED> LBA=3592687
Feb  7 00:19:27 mutka kernel: spec_getpages:(ad0s1a) I/O read failure: (error=5) bp 0xcb51d8e8 vp 0xc63e9000