Date: Sat, 5 May 2001 16:38:23 +0200 From: "Ron Klinkien" <rklinkien@chello.nl> To: <freebsd-scsi@freebsd.org> Subject: Re: Recovered data with positive head offset field replaceable unit msg Message-ID: <001d01c0d571$09711300$0404a8c0@smalweer.nl>
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Hi Bill, Back in the old days (1994) I ported ProbeSCSI from Solaris to the Amiga OS, so I know some things about SCSI, but these kind off messages make me a bit nervous.. ;-) Luckily I only got one of them. After investigation of the box (my firewall/mail/web server) I placed an extra fan between my 2 SCSI drives to cool them a bit. Did some buildworlds and stuff, and didn't found anything strange, so i'm a bit more relaxed now... The SCSI drive is not that old btw, it even has an SCA80 connector, it's an hot swappable disk that SUN uses in it's E450 machines for example. Thanks for your reply. Ron. > ----- Original Message ----- > From: "Bill Pechter" <pechter@ureach.com> > To: "Ron Klinkien" <rklinkien@chello.nl>; <freebsd-scsi@FreeBSD.ORG> > Sent: Saturday, May 05, 2001 1:55 PM > Subject: Re: Recovered data with positive head offset field replaceable unit > msg > > > > > Hi SCSI wizards, > > > > > > On one of my FreeBSD machines I found > > > this rather strange scsi message: > > > > > > > (da1:sym0:0:8:0): READ(06). CDB: 8 8 1 90 10 0 > > > > (da1:sym0:0:8:0): RECOVERED ERROR info:80198 asc:17,2 > > > (da1:sym0:0:8:0): Recovered data with positive head offset > > field replaceable unit: df sks:80,12 > > > > > > Thanks in advance. > > > > > > Regards, > > > Ron. > > > > Haven't seen something like that in years. > > In the old days of SMD disks and DEC RP06's and RM05's (mid > > 80's), I'd have said it was a servo tracking issue with the > > heads missing the data by a bit (possible bad spot on disk) > > which was recovered by the disk controller offsetting the heads > > a bit towards the center of the drive just a bit. > > > > The data was recoverable... by the drive moving the head just a > > little. Things like this were caused by bad spot on disk (servo > > platter or data platter) misalignment, dirt on the drive rails > > that caused the heads to bounce a bit while seeking or trying to > > stay on track, power fluctuations. Some idiot banging into the > > disks during a read operation. > > > > Folks -- do things like this still happen with modern scsi > > drives. Misalignment is probably out. Embedded servo's tend to > > eliminate a weak servo head. Dirt on drive rails -- nah. > > > > If it's a one shot error I wouldn't worry much -- but if it > > reoccurs... it's a problem. > > > > I've got a problem on one of the drives here that I know is the > > > > drive.da1: <SEAGATE SX910800N 8514> Fixed Direct Access SCSI-2 > > device > > da1: 10.000MB/s transfers (10.000MHz, offset 15), Tagged > > Queueing Enabled > > da1: 8669MB (17755614 512 byte sectors: 255H 63S/T 1105C) > > > > I get errors like this repeatedly on some parts of the disk: > > I plan to reformat it... I've considered turning off tagged > > queueing... > > > > sym0:1:control msgout: 80 20 79 d. > > sym0:1:control msgout: 80 20 6b d. > > (da1:sym0:0:1:0): WRITE(10). CDB: 2a 0 0 e2 4b 15 0 0 10 0 > > (da1:sym0:0:1:0): ABORTED COMMAND info:cf4b25 asc:4e,0 > > (da1:sym0:0:1:0): Overlapped commands attempted field > > replaceable unit: 1 > > > > sym0:1:control msgout: 80 20 1b d. > > sym0:1: message d sent on bad reselection. > > > > --Bill > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-scsi" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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