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Conference stkhlm::magtape

Title:	MAGNETIC TAPEDRIVES

Moderator:	STKHLM::GJOHNSSON

Created:	Mon Sep 21 1987
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	3775
Total number of notes:	13147

3720.0. "TZ88 VERIFY TIME ???" by WARFUT::MELLING () Fri Apr 11 1997 21:03

    
    	Hello,
    
    	I have a problem on a WinNT system where the time to verify 
    	is 3 to 4 times that of the backup time.
    	The customer is using a TZ88-DA connected to a STD I/O 
    	module in an AS2100 and using it in compressed mode.
    
    	Running tests on data,executable files copied from the
    	backoffice cd to a directory on the c drive gave similar 
    	results to that which the customer experiences.
    
    	I have run the same test to a TLZ07 and the backup and verify
    	times are quite close to each other.
    
    	The customer has service pack 5 installed
    
    
    	I would be grateful for any pointers on the above
    
    
    tony melling

T.R Title User Personal
Name Date Lines

3720.1 TAPE::PETERS Fri Apr 11 1997 23:52 15

T.R	Title	User	Personal Name	Date	Lines
3720.1		TAPE::PETERS		`Fri Apr 11 1997 23:52`	15
	You don't have a problem. It is working exactly as designed. The TZ88 doesn't like start/stop motion. The verify pass reads a record, reads the disk, does the compare, and starts again. This takes enough time to cause the TZ88 to reposition after every cache full. The TZ88 takes a few seconds to reposition. The TZ88 takes a much longer time to reposition than a TLZ07 does. The solution is to stop using verify on most of your backup operations. A verify now and then, coupled with a few test restores should be enough to test your backup process and protect your data. Steve P.


	You don't have a problem. It is working exactly as designed.
The TZ88 doesn't like start/stop motion. The verify pass reads a record,
reads the disk, does the compare, and starts again. This takes enough time
to cause the TZ88 to reposition after every cache full. The TZ88 takes a 
few seconds to reposition. The TZ88 takes a much longer time to reposition
than a TLZ07 does.

	The solution is to stop using verify on most of your backup operations.
A verify now and then, coupled with a few test restores should be enough
to test your backup process and protect your data.


			Steve P.