Richard,
Let me see if I understand this right. You mentioned, " The
compression algorithms in tape drive hardware are usually the
best.......", ,so the tape drive has a built in setting that automatically
compresses the data. Or do they have to be set manually? When can locate
this setting?
Thanks.
Avy Wong
Business Continuity Administrator
Mohegan Sun
1 Mohegan Sun Blvd
Uncasville, CT 06382
ext 28164
Richard Sims
<[EMAIL PROTECTED]>
Sent by: "ADSM: To
Dist Stor [email protected]
Manager" cc
<[EMAIL PROTECTED]
.EDU> Subject
Re: [ADSM-L] question on
Compression
06/28/2007 01:02
PM
Please respond to
"ADSM: Dist Stor
Manager"
<[EMAIL PROTECTED]
.EDU>
On Jun 28, 2007, at 12:24 PM, Avy Wong wrote:
> Hello Guru(s),
>
> When it comes to data compression on the client side, is it
> true that
> when the data sent to tape drives it will be compressed again?
> are all
> tape drives for data compression default set to yes? How can I
> find that
> out? ...
Avy -
Compression is governed by your Devclass settings.
You can typically verify that compression is set via OS queries; for
example, in AIX one can do like 'lsattr -El rmt0'.
The compression algorithms in tape drive hardware are usually the
best, and though will attempt compression per your settings, the data
will not expand as in some host software compression algorithms.
Client-side compression is often not used, because it so taxes the
client; but this has to be balanced against network loading, the
other major factor.
Richard Sims
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