Bacula-users

Re: [Bacula-users] LTO3 tape capacity (variable?)

2012-09-30 17:45:14
Subject: Re: [Bacula-users] LTO3 tape capacity (variable?)
From: Cejka Rudolf <cejkar AT fit.vutbr DOT cz>
To: Alan Brown <ajb2 AT mssl.ucl.ac DOT uk>
Date: Sun, 30 Sep 2012 23:42:37 +0200
Alan Brown wrote (2012/09/28):
> > Aren't these considered reasonable settings for LTO3?
> >
> >     Maximum block size = 262144           # 256kb
> >     Maximum File Size = 2gb
> 
> Not really.

Hi, I have

  Maximum Block Size = 65536
  Maximum File Size = 4gb

and without any problem. All tapes have over 400,000,000,000 bytes,
except 2 of 116, where I think that one was forced to change, so just
1 of 116 has under 400 GB (around 380 GB). Almost all tapes are
7 years old now. My typical end of tape mesage is like

End of medium on Volume "" Bytes=618,539,200,512 Blocks=9,438,187

> Change maximum file size to 10Gb and maximum block size to 2M

However, then please test readibility of these data on all systems
you could possibly use. Increasing blocks size is potentially dangerous,
so before increasing it, be sure, that you can read all these data back.

-- 
Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar
Brno University of Technology, Faculty of Information Technology
Bozetechova 2, 612 66  Brno, Czech Republic

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