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 > point....well 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 >> >> >>____________________________________________________________________________ >>This communication and any attachments are confidential and intended for the > > sole use of the > >>intended recipient. Any form of copying or disclosure of this communication > > to any third parties > >>without permission is prohibited. The contents of this communication and > > its attachments are > >>not intended to be relied upon in law without subsequent written > > confirmation. As such, Dunns > >>Stores (Pty) Ltd accept no responsibility or liability (including > > negligence) for the consequences > >>of anyone acting, or not acting, on information contained therein. >> >>If you have received this communication in error please notify us > > immediately and destroy or > >>delete it. >>____________________________________________________________________________ > > > > ____________________________________________________________________________ > This communication and any attachments are confidential and intended for the > sole use of the > intended recipient. Any form of copying or disclosure of this communication > to any third parties > without permission is prohibited. The contents of this communication and its > attachments are > not intended to be relied upon in law without subsequent written > confirmation. As such, Dunns > Stores (Pty) Ltd accept no responsibility or liability (including negligence) > for the consequences > of anyone acting, or not acting, on information contained therein. > > If you have received this communication in error please notify us immediately > and destroy or > delete it. > ____________________________________________________________________________ > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. 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