[Search for users] [Overall Top Noters] [List of all Conferences] [Download this site]

Conference ssag::ask_ssag

Title:	Ask the Storage Architecture Group
Notice:	Check out our web page at http://www-starch.shr.dec.com
Moderator:	SSAG::TERZAN

Created:	Wed Oct 15 1986
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	6756
Total number of notes:	25276

6721.0. "Problems with TZ87 being overwritten, not unloaded." by CSC32::DUNCAN () Tue May 27 1997 15:35

	I have a customer problem on a Prioris running NT V4.0 with SP2 and
	MS SQL V6.5 with SP2.  He has 14 RZ29's and a 55gb database.  The
	problem is that the customer is using SQL to dump his 55gb database
	from within SQL and the database fills the tape, the tape rewinds, and
	SQL begins writing over the previously recorded data.  It doesn't 
	do an unload at the end of the tape.  The tape drive being used in a
	TZ87 with firmware 9B3C.  Has anyone run across a problem like this?
	Thanks in advance.

	Bill Duncan

T.R	Title	User	Personal Name	Date	Lines
6721.1		SSDEVO::ROLLOW	Dr. File System's Home for Wayward Inodes.	`Wed May 28 1997 00:12`	4
	If the application doesn't do a SCSI Unload as part of its rewind, then the drive is behaving as expected. If the application does include a SCSI Unload, then something is wrong...
6721.2	Also occurs in NT Backup	CSC32::DUNCAN		`Wed May 28 1997 13:42`	13
	><<< Note 6721.1 by SSDEVO::ROLLOW "Dr. File System's Home for Wayward Inodes." >>> > > If the application doesn't do a SCSI Unload as part of > its rewind, then the drive is behaving as expected. If > the application does include a SCSI Unload, then something > is wrong... We had the customer try using the TZ87 with the Windows NT OS and NT Backup and it failed in the same fashion. It rewound the tape and started writing. At this point I suspect a problem with hardware. Bill Duncan
6721.3		SUBSYS::VIDIOT::PATENAUDE	Ask your boss for ARRAY's...	`Wed May 28 1997 21:29`	8
	Don't be so sure.. As Alan said the app HAS TO do an unload. Some drives do this automatically some don't. The DLT family is the later. It's up to the APP to make sure the tape has/hasn't been swapped. roger.
6721.4		netbk2.shr.dec.com::Peters		`Thu May 29 1997 08:09`	7
	The TZ87 has been tested and works with Windows NT Backup. If this drive is having trouble it is broken. Steve Peters
6721.5	Wrong assumption.	SUBSYS::TRAN	Straight <Left> Hitter..	`Thu May 29 1997 16:23`	6
	Backup driver assumes that the drive will spindown. There is a bit that can be set to do this but DIGITAL DLT tape drive doesn't set this bit. We've gone thru this drill before. T.