Re: DLT Data Integrity?

1997-12-30 16:28:08
Subject: Re: DLT Data Integrity?
From: Kalle Kansa <KKansa AT TWEDDLE DOT COM>
Date: Tue, 30 Dec 1997 16:28:08 -0500
I was seeing the similar messges after installing ADSM ptf 15 with
Magstar 3570 drives.  The
appears to be solved with getting the microcode updated on the 3570 and
installing the latest
Atape driver.

> -----Original Message-----
> From: Bob Booth - CSO [SMTP:booth AT CHIANTI.CSO.UIUC DOT EDU]
> Sent: Tuesday, December 30, 1997 11:26 AM
> Subject:      DLT Data Integrity?
> I am wondering if anyone has experience with AIX ADSM and DLT drives.
> After
> upgrading to ADSM ptf 15, I seem to be having many instances of 'SCSI'
> errors
> on my DLT 2000XT drives.
> The errors occur during read operations, like backup stg and reclaims.
> I get the famous ANR8302E I/O error:
> ANR8302E I/O error on drive DLTTAPE4 (/dev/mt3) (OP=LOCATE, CC=205,
> Description=SCSI adapter failure).  Refer to Appendix B in the
> 'Messages'
> manual for recommended action.
> I know that the 'LOCATE' on DLT's is a drive function, since it loads
> the
> tape information into the drives memory.  ADSM is flagging the error
> as a
> SCSI error, but it seems to be a problem with the tape.  The driver
> reports
> this error and then ADSM rewinds the tape and verifys the label.
> In some cases, the tapes are relatively new, and this can happen in
> any
> of the drives.  I have replaced the SCSI card, but I still get the
> errors.
> It seems that more and more of my data is becoming unreadable, and I
> am
> starting to worry that I will not be able to retrieve data from these
> tapes.
> I also worry, since these tapes don't have any 'write' errors, that
> data is
> not being written correctly to the tapes, or that information is
> getting
> lost.
> Another irritation is the amount of time it is taking for these
> operations
> to complete, since the tape is constantly being re-wound to the
> beginning,
> which I assume is the drive reloading the TOC from the tape??
> Is there any experience out there with these problems?  Is there some
> advanced tracing I can use to find out if the tapes, drives, or
> adapters
> are bad?  The error report on the AIX box, is not reporting SCSI
> errors, but
> which yield some sense bytes.
> Thanks in advance for any help, or insight!
> Bob Booth
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