On Jul 17, 2008, at 8:24 PM, Chris Hoogendyk wrote:

>
>
> Dan Langille wrote:
>> On Jul 17, 2008, at 10:06 AM, Shad L. Lords wrote:
>>
>>
>>> John Drescher wrote:
>>>>> Is this something that would even be possible to implement in the
>>>>> future?  Would anyone else be interested in something like this?
>>>>>
>>>> That will not work, You need to have the storage daemon on only the
>>>> host with the tape drives and modify mtx-changer to send mtx  
>>>> commands
>>>> via ssh. This should not be too difficult.
>>>>
>>> That is too bad in addition to possibly having issues with multiple
>>> mtx
>>> commands attempting to be sent at the same time it also makes it
>>> impossible to define all 4 drives as available for use from a job.
>>> Because all 4 drives are in the same autochanger and they all have
>>> access to the same tapes it would be nice to just use ait4-changer,
>>> ait4
>>> for the storage definition and have it pick one of the 4 (or all 4)
>>> for
>>> writing.  One of the reasons for splitting drives between hosts  
>>> was to
>>> improve the speed of the backup.  By having the restriction of the
>>> autochanger and drives belonging to the same host you are  
>>> complicating
>>> the setup.
>>>
>>
>> This is subjective.  You see it as a complication.  I see it as a
>> simplification.
>>
>
> Coming at it from another direction . . .
>
> Having spent a bundle on a robotic tape system with 4 drives, isn't it
> worth looking at the server to see where its performance issues are
> (presuming that's what lead to the current discussion)?
>
> AIT4 doesn't require the throughput that an LTO3 or LTO4 would  
> require,
> and there are people on the list who have dealt with that level of
> throughput. There are servers available that have multiple GigE
> interfaces and multiple slots to add high speed cards (say dual LVD320
> SCSI) for peripherals and mutliple CPUs. Find out where the balance is
> or where the bottlenecks are in your current system. Then either  
> tune it
> up or replace it.
>
> Just a thought. That's where I'd be looking.

That is much more constructive than what I had to say. Thank you.

-- 
Dan Langille -- http://www.langille.org/






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