Veritas-bu

Re: [Veritas-bu] block size for restore

2009-02-18 15:44:43
Subject: Re: [Veritas-bu] block size for restore
From: "Martin, Jonathan" <JMARTI05 AT intersil DOT com>
To: <jon-bousselot AT pacbell DOT net>, <veritas-bu AT mailman.eng.auburn DOT edu>
Date: Wed, 18 Feb 2009 15:27:37 -0500
My understanding is that LTO4 drives are not backwards-read compatible with 
LTO1.  Only LTO2 & LTO3.
 
LTO = Read 2 versions Back, Write 1 version Back.
 
-Jonathan

________________________________

From: veritas-bu-bounces AT mailman.eng.auburn DOT edu on behalf of Jon 
Bousselot
Sent: Wed 2/18/2009 2:26 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] block size for restore



This one has me stumped.
Windows 2003 with all the latest patches.
Media written since 2003 shows up in the bpimagelist -L as having a
media block size of 65536.

Upgrade to 6.5.3
SIZE_DATA_BUFFERS must now be 32768 because if it is anything else, I
get media write errors.

When I try and restore data, the bptm logs show this


2/17/2009 1:46:05 PM - Error bptm(pid=1996) tapemark or blank tape
encountered reading media header, drive index 1 
2/17/2009 1:46:06 PM - Error bptm(pid=1996) The tape device at index 1
has a maximum block size of 32768 bytes, a buffer size of 65536 cannot
be used
2/17/2009 1:46:06 PM - Error bptm(pid=512) The following files/folders
were not restored:      


I cannot read the old LTO-1 tapes.  They were stored at Iron Mountain
safely, and I tried more than three tapes from various years.
I verified the hotfix numbers for tape.sys and even tried updated tape
drive drivers with no success.

NB docs (perf tuning guide) say the SIZE_DATA_BUFFERS is not even used
during a restore operation.
Is there a registry key that is forcing the drive to only accept 32k
blocks?
The LTO-4 drive is working just fine even at the 32k block size.

-Jon Bousselot
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