Hi Adrian

I used to believe that the recommendation to use separate HBAs for disk
and tape traffic was just that and could be safely ignored.  However we
had a customer with a large Exchange infrastructure, Lan free and shared
traffic that had repeated backup corruptions.  The appropriate people
dug down deep and it was determined that the lack of separation was the
cause.

I was not personally involved in the original corruption, so I'm not
sure exactly what the symptoms were: I was involved in a huge long
running emergency process to get the 3 of 4 cluster upgraded with extra
HBAs, and I have believed in tape and disk separation like a convert
ever since.

Regards

Steve

Steven Harris
Paraparaumu, New Zealand


Adrian Compton wrote:

Hi all

We are using a JS12 Blade in a IBM Blade Centre running AIX 5300-10, 
Atape.driver  12.0.4.0, EMC SAN using NAVIAGENT and NAVICLIENT  6.28.21.0.
Tape and SAN traffic running through the Blade FC Card, and the other FC is 
configured as failover. We are using this config in Mauritius and do not have 
any errors at all.

The Tape Library is a TS3310 with a 9U expansion unit, and all licensing is 
configured.
We have 4 x LTO3 FC 4GB Drives.

The Library is running firmware as below:

3576-MTL Firmware Version
570G.GS025
Robot Firmware Version
102Q.GR004
Imager Firmware Version
000
BSP Level
6.73
Last Update
10/14/2009 9:34

The drives firmware is as below:
Drives:
93G0

TSM Server Enterprise Edition is running at version 5.5.2, with a 2TB disk 
storage pool on the SAN, that is used for OS/NT level backups.
All DB/Large/streaming structure backups go to Tapepools.

Current errors from the TSM actlog are as follows, and these same errors are 
experienced sporadically as well during other operations such as 
migration/reclaim etc, so not only limited to reads:

3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for RDBLKID operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVXMB01_EXCH, Type Backup 
(Active), Filespace ABOVXMB01\Second Storage Group, fsId 2, File Name 
\data\0000\Mailbox Database 2\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVXMB01_EXCH, Type Backup 
(Active), Filespace ABOVXMB01\Second Storage Group, fsId 2, File Name \logs\ 
full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVSAPP01_DB, Type Backup 
(Active), Filespace /APR, fsId 1, File Name \NODE0000\ 
DB_INCR_BACKUP.20100314230307.1.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVSAPP01_DB, Type Backup 
(Active), Filespace /APR, fsId 1, File Name \NODE0000\ 
DB_INCR_BACKUP.20100314230307.2.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVSAPD01_DB, Type Backup 
(Active), Filespace /ADV, fsId 1, File Name \NODE0000\ 
DB_INCR_BACKUP.20100315000307.1.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVSAPD01_DB, Type Backup 
(Active), Filespace /ADV, fsId 1, File Name \NODE0000\ 
DB_INCR_BACKUP.20100315000307.2.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\data\0001, fsId 2, File Name \citrix\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\meta\0000, fsId 1, File Name \citrix\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\data\0001, fsId 2, File Name \master\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\meta\0000, fsId 1, File Name \master\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\data\0001, fsId 2, File Name \model\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\meta\0000, fsId 1, File Name \model\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\data\0001, fsId 2, File Name \msdb\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVLIC01_SQL, Type Backup 
(Inactive), Filespace ABOVLIC01\meta\0000, fsId 1, File Name \msdb\ full.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVSAPS01_DB, Type Backup 
(Active), Filespace /ASM, fsId 1, File Name \NODE0000\ 
DB_INCR_BACKUP.20100315013308.1.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for LOCATE operation, errno = 79.
3/18/2010 8:28:23 AM ANR2335W Audit Volume has encountered an I/O error for 
volume ABO015L3 while attempting to read: Node ABOVSAPS01_DB, Type Backup 
(Active), Filespace /ASM, fsId 1, File Name \NODE0000\ 
DB_INCR_BACKUP.20100315013308.2.
3/18/2010 8:28:23 AM ANR8311E An I/O error occurred while accessing drive 
LTO3DR2 (/dev/rmt0) for OFFL operation, errno = 79.


I really appreciate your input and assistance. I am pulling my hair out now and 
IBM is confused as well.

Regards

Adrian Compton
Group IT Infrastructure
Pharmacare Limited trading as Aspen Pharmacare
P O Box 4002
Korsten
Port Elizabeth
6014
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