Hi,
Very similar to a question received yesterday:
If you set (manually) compression on your DLT (the normal default setting)
the DLT drive will "always" try and compress what it receives. This wont
necessarily be a good ratio - especially if you switch software compression
on as well (you cant zip an zipped file again) ...
If you use the compressasm Legato will attempt to do software side
compression - which will have a CPU and system overhead and will probably
slow your backup down.
Rather - NOT - use the compress directive (create your own directives to
skip files you dont want backed up) and let the DLT7000 do the compression.
I have found that hardware compression (the DLT drive) is a whole lot faster
than software (legato, windows, OS etc) compression.
Hope this answers your question,
Regards,
Riaan
-----Original Message-----
From: Librado Pamintuan [mailto:LPAMINTU AT REGINA DOT CA]
Sent: Monday, September 15, 2003 11:13 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: [Networker] DLT 7000 compression
Hello All,
If you manually set the DLT 7000 tape drive to 35 Gb compressed mode,
will Legato Networker over ride this setting if the client directives
are not set to compress?
We cannot user software compression because it might be causing the
corruption of our big MS Access database files when restored.
Environment:
Networker for Unix v5.5
Server O/S: AIX v4.3.3
Tape Library: STK 9714 with 6 DLT 7000 drives
Client: NetWare v6.x
thanks in advance,
Librado Pamintuan
Technical Support Analyst II
Information Systems Dep.
Operations Group
City of Regina
Phone: (306) 777-7573
General Fax: (306) 777-6804
eFax: (306) 546-6002
eMail: lpamintu AT regina DOT ca
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