Hi,
On 9/27/2006 9:08 AM, Janco van der Merwe wrote:
By Client compression do you mean the Compression=GZIP or the default
compression? My Bacula is pretty much still default nothing special at this
pointwell apart from the amount of data being backed up. If it is not
possible at this point is there a possibility in the near future for Bacula
to include the ratio, by that I mean will it be possible for the Bacula to
include the ratio from the Hardware?
That won't be possible, I guess.
There's no reliable way of determining the compression ratio the drives
hardware achieves. (Well, there might be ways for distinct devices, but
nothing portable or even standardized as far as I know.)
Actually, the compression ratio you achieve has noting to do with
Bacula. I's just a thing between the tape drive and, most important,
your data.
Storing plain text data on a tape with harware compression tends to
result in very high compression ratio. If you manage to get 1 TB of mp3s
onto a LTO3 tape I'd be rather astonished as that data should not be
compressible.
Keep in mind that what the manufactures say about compressed capacity
usually has a clause like typically... assuming a compression ratio of
2:1 or, case of Sony, 2.6:1. That's not much more than an educated
guess with lots of marketing language added to it :-)
Anyway, the only reliable way of determining the effective compression
ratio is comparing the tapes uncompressed capacity (which you'd have to
measure on a per-tape basis) and the capacity you achieve with
compressed data.
Arno
Janco v.d Merwe
Network Administrator
Dunns Stores (PTY) Ltd
Switchboard: 011 541 3000
Direct: 011 541 3007
Fax: 086 632 1708
-Original Message-
From: Kern Sibbald [mailto:[EMAIL PROTECTED]
Sent: 27 September, 2006 08:29
To: bacula-users@lists.sourceforge.net
Cc: Janco van der Merwe
Subject: Re: [Bacula-users] Compression ratio
On Wednesday 27 September 2006 08:15, Janco van der Merwe wrote:
On my previous e-mail that I sent to the forum I showed you the amount of
data that was backed up to a single LTO3 tape and I received a request from
the management to see if I, or rather Bacula, can't give the compression
ratio details in the notification e-mail. I went through the manual to see if
there is a way but I can't find it, most probably missed it, but is there a
way that I can do that?
Bacula provides the compression ratio if you turn on Client compression,
which
I don't recommend especially with the results you are getting. With hardware
compression, Bacula has insufficient information.
Janco v.d Merwe
Network Administrator
Dunns Stores (PTY) Ltd
Switchboard: 011 541 3000
Direct: 011 541 3007
Fax: 086 632 1708
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