Date: Mon, 27 Aug 2018 15:54:11 +0100 From: Dave <freebsd01@dgmm.net> To: freebsd-questions@freebsd.org Subject: Re: disk or cable error? (CAM status: ATA Status Error) Message-ID: <2592661.slyIVfH816@amd.asgard.uk> In-Reply-To: <dd5dbfd6-4429-d110-f83f-4b16f8d27c14@zyxst.net> References: <c9124cc8-7be9-a0ad-62f3-2ebebbd00a9b@riseup.net> <dd5dbfd6-4429-d110-f83f-4b16f8d27c14@zyxst.net>
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On Monday 27 August 2018 12:46:36 tech-lists wrote: > On 26/08/2018 16:01, ixbug@riseup.net wrote: > > Do any of these errors provide hints as to whether this is a disk > > error affecting both at the same time or broken cable? (both disks > > are connected to the mainboard via the same cable) > > these values: > > 5 Reallocated_Sector_Ct > 196 Reallocated_Event_Count > 197 Current_Pending_Sector > 198 Offline_Uncorrectable > > are all zero for both disks, so if these remain zero after a successful > long test with *no LBA errors* then that would seem to me at least to > indicate there's no problems with the disks themselves. If, in the face > of those results, this persisted: > > > (ada1:ahcich1:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 08 90 a4 aa 40 1d 00 00 00 00 00 > > (ada1:ahcich1:0:0:0): CAM status: ATA Status Error > > (ada1:ahcich1:0:0:0): ATA status: 41 (DRDY ERR), error: 10 (IDNF ) > > then yeah I'd say bad cable/bad interface > IME "199 UDMA_CRC_Error_Count" at zero generally means the SATA cable is fine. A failing cable that works most of the time almost always results in an ever increasing CRC Error Count. No guarantees, obviously, but it moves the odds in favour of something else being the problem. I have seen cheap nasty SATA cables result in no CRC Error Count but the drive dropping off the system. It can be cured temporarily by plugging/unplugging the connector a few times to "scrape clean" the contacts. I would guess it's two different metals reacting poorly with each other, especially in a humid environment. Having said that, even decent SATA cables are cheap and it can't hurt to try replacing them first if diagnostics can't point to a specific cause.
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