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I'm getting a ton of errors like the following during a raid rebuild after replacing a harddisk. SMART values of the new disk look perfectly fine. Are the errors likely to be caused by a faulty disk, a bad cable or a bad SATA controller?

The system is using a consumer-grade gigabyte mainboard with an intel chipset. ata8 is the G_SATA controller.

Something really odd (might be coincidence but worked two three times now): After starting a SMART short self-test the rebuild speed went up again and the errors stopped flooding my kernel log.

[190643.827298] ata8.00: failed command: WRITE FPDMA QUEUED
[190643.827301] ata8.00: cmd 61/08:e8:68:88:e3/00:00:29:00:00/40 tag 29 ncq 4096 out
[190643.827302]          res 40/00:64:c0:8c:e3/00:00:29:00:00/40 Emask 0x10 (ATA bus error)
[190643.827304] ata8.00: status: { DRDY }
[190643.827305] ata8.00: failed command: WRITE FPDMA QUEUED
[190643.827308] ata8.00: cmd 61/08:f0:98:88:e3/00:00:29:00:00/40 tag 30 ncq 4096 out
[190643.827309]          res 40/00:64:c0:8c:e3/00:00:29:00:00/40 Emask 0x10 (ATA bus error)
[190643.827311] ata8.00: status: { DRDY }
[190643.827313] ata8: hard resetting link
[190651.228333] ata8: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[190651.249735] ata8.00: configured for UDMA/33
[190651.249784] ata8: EH complete
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SMART short test isn't particularly conclusive, thought it tends to err on the side of fail rather than pass. A long test would be better. What's the RAID card? 3WARE apparently have a security setting to lock the disk, see: spinics.net/lists/linux-ide/msg38500.html –  Dr. Edward Morbius Jun 26 '12 at 18:15
    
It's software (md) raid. And no matter how good the SMART test is - how can running it make that problem go away? –  ThiefMaster Jun 26 '12 at 18:57

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