Backup Central

I always use compression at the drive level. No need to have the client doing all that work. However, if you have particularly slow network connections, client compression might be useful.



Gary Lee
Senior System Programmer
Ball State University
phone: 765-285-1310


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L < at > VM.MARIST.EDU] On Behalf Of Botelho, Tiago (External)
Sent: Thursday, January 19, 2012 4:57 AM
To: ADSM-L < at > VM.MARIST.EDU
Subject: Re: [ADSM-L] LTO4 Tape Volumes with diferent Estimated Capacity

Hello all

Thank you for your all answers.

Regarding to your experience what is more efficiency regarding to tape
usage capacity (increase tape amount of data stored)? Compression on
client or compression on Drive(HW)?


Cumprimentos / Best regards

Tiago Botelho


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L < at > VM.MARIST.EDU] On Behalf Of
Botelho, Tiago (External)
Sent: quarta-feira, 18 de Janeiro de 2012 15:27
To: ADSM-L < at > VM.MARIST.EDU
Subject: [ADSM-L] LTO4 Tape Volumes with diferent Estimated Capacity



Hello



I have several tape volumes (LTO4) with different Estimated Capacity.
What can cause this situation?



Ex:

A00035L4 WIN_SRV_T TS3310 629.5 G
95.4 Full

A00039L4 WIN_SRV_T TS3310 1.1 T
98.2 Full

A00101L4 WIN_SRV_T TS3310 884.8 G
84.4 Full

A00113L4 WIN_SRV_T TS3310 1.0 T
93.7 Full

A00118L4 WIN_SRV_T TS3310 1.0 T
73.6 Full

A00128L4 WIN_SRV_T TS3310 1.0 T
99.2 Full

A00129L4 WIN_SRV_T TS3310 969.1 G
93.7 Full

A00133L4 WIN_SRV_T TS3310 934.8 G
96.1 Full





All tapes and Drives are LTO4, TSM Server 553 for AIX.



The devc are configured as:



Device Class Name: TS3310

Device Access Strategy: Sequential

Storage Pool Count: 16

Device Type: LTO

Format: ULTRIUM4C

Est/Max Capacity (MB):

Mount Limit: DRIVES

Mount Wait (min): 60

Mount Retention (min): 60

Label Prefix: ADSM

Library: TS3310

Directory:

Server Name:

Retry Period:

Retry Interval:

Shared:

High-level Address:

Minimum Capacity:

WORM: No

Drive Encryption: Off

Scaled Capacity:

Last Update by (administrator): ADM

Last Update Date/Time: 07/27/09 17:32:05



Cumprimentos / Best regards

Tiago Botelho

We ask client admins to compress their data if they are encrypting it, since encrypted data cannot be compressed by tape drives. It's important to note that certain file types don't compress well, and to exclude them with exclude.compress statements.
Keith