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Michael Galloway wrote:
> On Wed, Sep 03, 2008 at 11:59:49AM -0400, Ryan Novosielski wrote:
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>> Chris Howells wrote:
>>> Michael Galloway wrote:
>>>
>>>> how does concurency work for tape libraries? can i use spooling and 
>>>> concurrency?
>>>> would that help? i've already got spooling job (2GB segments) and 
>>>> attributes.
>>> You can use concurrency with tape, yes. I write five concurrent jobs to 
>>> LTO-4. (I have an autochanger, but it's only got a single LTO4 tape 
>>> drive in it).
>>>
>>> The bacula manual warns somewhat against using concurrent jobs with 
>>> tape, but I've been using it for a year, every restore has been 100% 
>>> perfect, and the restore speed is absolutely fine for my needs, it's 
>>> pretty quick anyway.
>>>
>>> I'm not sure about spooling as I don't use it but I understand it can 
>>> help to increase restore speed, but as I said, I don't have a problem 
>>> with restore speed anyway.
>> You should use spooling. I'm not 100% sure that interleaving should even
>> be allowed, as I've heard of some people having strange things happening
>> with it enabled. Also takes life off your tape head, if I'm not mistaken.
>>
> 
> are there any recommendations on the size of the spool segment?

Not that I know of. I do 16GB which is the largest I have space for
(generally the whole tape). There's probably some attention given in the
manual.

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 |Y#| |  | |\/| |  \ |\ |  | |Ryan Novosielski - Systems Programmer II
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