Hello All,
thanks for the answers concerning bigasm. I agree that 45-55MB/s is good on LTO2
however if you use dd comming from /dev/zero (creates only zero's), the
compression should be the highest possible since zeroes are very good
compressable.
however we also see a max speed of 45-55MB/s using /dev/zero.
does anybody has tested this?
bart
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of Matthew Robert
Sent: Tuesday, May 02, 2006 2:47 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] maximum speed to tape using bigasm and /dev/zero
This email is to be read subject to the disclaimer below.
My personal best is 189MB/sec on LTO3 backing up a mix of file & print data and
some big SQL dbases at once.
Im going to give bigasm a run to see how well it runs..
Cheers,
Matt
Preston de Guise <enterprise.backup AT GMAIL DOT COM> Sent by: Legato NetWorker
discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>
02/05/2006 10:34 AM
Please respond to
Legato NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU>; Please
respond to Preston de Guise <enterprise.backup AT GMAIL DOT COM> All email is
logged and may be reviewed - Refer policy FP206
To
NETWORKER AT LISTSERV.TEMPLE DOT EDU
cc
Subject
Re: [Networker] maximum speed to tape using bigasm and /dev/zero
Typically running bigasm against IBM LTO-2 tape drives on Solaris hosts I have
seen a peak speed of around 42MB/s. On the whole, bigasm does generally
represent a nice level of compression without going overboard.
On the second general question of "what speed have you obtained", the best yet
remains an LTO-1 tape drive which ran at around 98MB/s backing up heaps of
holey SQL databases...
Cheers,
Preston.
--
eBook coming soon, "Backup and Recovery, a Corporate Insurance Policy", a must
have policy advisor and environment evaluation toolkit for administrators and
managers running enterprise backup environments.
To sign off this list, send email to listserv AT listserv.temple DOT edu and
type "signoff networker" in the body of the email. Please write to
networker-request AT listserv.temple DOT edu
if you have any problems
wit this list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or via RSS at
http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
--------------------
NOTICE - This communication contains information which is confidential and the
copyright of Ernst & Young or a third party.
If you are not the intended recipient of this communication please delete and
destroy all copies and telephone Ernst & Young on 1800 655 717 immediately. If
you are the intended recipient of this communication you should not copy,
disclose or distribute this communication without the authority of Ernst &
Young.
Any views expressed in this Communication are those of the individual sender,
except where the sender specifically states them to be the views of Ernst &
Young.
Except as required at law, Ernst & Young does not represent, warrant and/or
guarantee that the integrity of this communication has been maintained nor that
the communication is free of errors, virus, interception or interference.
Liability limited by a scheme approved under Professional Standards Legislation.
--------------------
If this communication is a "commercial electronic message" (as defined in the
Spam Act 2003) and you do not wish to receive communications such as this,
please forward this communication to unsubscribe AT au.ey DOT com
To sign off this list, send email to listserv AT listserv.temple DOT edu and
type "signoff networker" in the body of the email. Please write to
networker-request AT listserv.temple DOT edu if you have any problems wit this
list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or via RSS at
http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
To sign off this list, send email to listserv AT listserv.temple DOT edu and
type "signoff networker" in the
body of the email. Please write to networker-request AT listserv.temple DOT edu
if you have any problems
wit this list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
|
