Hi,

03.07.2008 11:56, S.Lehmann8 AT DeutschePost DOT de wrote:
> Hi,
> 
> I had the same problem and made the tests you gave. 
> Result is, that the tape is very fast in tape positioning with mt, but with 
> bacula, restore is very slow.

Ok. That's not good, but it narrows down the possible reasons for the 
slowness.

> 
> I have set some options, but there are already the defaults:
> 
> Device {
>   Name = SL500-1-Drive-1
>   Drive Index = 0
>   Media Type = LTO-3
>   Archive Device = /dev/nst0
>   Automatic Mount = yes
>   Auto Changer = yes
>   Alert Command = "sh -c 'tapeinfo -f %c |grep TapeAlert|cat'"
>   Label Media = yes
>   Random Access = No
> 
>   Hardware End Of Medium = Yes
>   Fast Forward Space File = Yes
>   Use MTIOCGET = Yes
> 
> }
> 
> At bconsole and the command stat sd you can see, that bacula not is using 
> Fast forward spaceing to jump to the file to restore.

Bug report time, I guess :-)

Which version of Bacula do you run?

And can you send console output showing the problem (probably 'sta 
sd=...' with debug output enabled, right?)

> The same problem persists with the file-devices!

So it seems to be a general problem of the SD setting up its devices.

If you don't report this on bugs.bacula.org, I'll do so if you send me 
more details :-)

Arno

> Greetings
> Sebastian
> 
>> -----Ursprüngliche Nachricht-----
>> Von: bacula-users-bounces AT lists.sourceforge DOT net 
>> [mailto:bacula-users-bounces AT lists.sourceforge DOT net] Im 
>> Auftrag von Arno Lehmann
>> Gesendet: Mittwoch, 2. Juli 2008 23:27
>> An: bacula-users AT lists.sourceforge DOT net
>> Betreff: Re: [Bacula-users] restore runs infinite
>>
>>
>> Hello,
>>
>> 02.07.2008 14:10, Udo Lembke wrote:
>>> Hi,
>>> below is our sd.conf.
>>> The baculahost is an amd64 Gentoo-Linux (Gentoo Base System release
> 
> <snip>
> 
>> Now I can only recommend to do some tests (without the SD running, or 
>> at least with unmounted tapes!):
>> - Load a full and *write-protected* tape
>> - time mt -f /dev/nst0 rew (should be instantaneous with a freshly 
>> loaded tape)
>> - time mt -f ... eom (might take a while - positioning to the end of 
>> the tape) Keep the time this takes in mind
>> - mt -f ... status Note the file number mt reports. It should be 
>> pretty high.
>> - mt -f ... rew again
>> - mt -f fsfm <number a bit below the one you found out above> This is 
>> the time you can expect to need to wait after initiating a restore, 
>> before the tape is positioned to the right place.
>> - unload the tape, remove the write protection, load the tape 
>> into the 
>> autochanger and enable Bacula for this tape drive again (mounting or 
>> starting the SD).
>>
>> Normally, tape positioning should not take more than a few 
>> minutes for 
>> LTO.
>>
>> If it does, the tape drive is not doing fast seeks but the driver 
>> reads actual data until it reaches the specified position. If that 
>> happens, and is not due to the SD configuration, you'll have to 
>> examine how the st driver determines its mode of operation - I never 
>> encountered such a case...
>>
>> Hope this helps you examining this a bit.
>>
>> And, of course, it *could* be that, actually, Bacula had to do some 
>> work internally (though your output didn't look like that).
>>
>> Arno
>>
>> -- 
>>
> 
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-- 
Arno Lehmann
IT-Service Lehmann
www.its-lehmann.de

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