Alan Brown wrote:
> On Tue, 9 Dec 2008, Brian Debelius wrote:
>
>   
>> John Drescher wrote:
>>     
>>> In linux, I find this to be completely wrong. I have 15TB of software
>>> raid 6 and the most load that it puts on the cpu is around 7% and
>>> these are raid arrays that net over 200MB/s writes on single core
>>> systems that are 3 or so years old.
>>>       
>
>   
>> So what do you think a reasonable cpu for bacula would be?
>>     
>
> I'm running spooling on a 4 drive software raid0 quite happily on a 4Gb
> 3GHz P4D machine. The limiting factors are disk head seek time(*) when
> running concurrent backups to 2 LTO2 drives and available SATA ports.
> Because of that I'm considering dropping in solid state disks.
>   

I've been wondering about those, but was thinking it would be better 
used as DB storage for Mysql, where I/Os per second is going to be more 
important than throughput. I see your point, though, where concurrent 
jobs are running.

> (*) The SD array is more than fast enough to drive a single LTO4 drive for
> one backup, but when driving 2 LTO2 drives and running up to 6
> simultaneous backups, the heads thrash quite hard and throughput slows by
> 50%. Installing 15krpm drives over the existing 7500rpm ones won't help as
> that only reduces seek time by about 10-15%.
>
> This machine also has the Bacula director and Mysql on it, Mysql is the
> main memory hog, with the director coming in as the CPU hog. The biggest
> single problem is memory - due to the database size (40Gb bacula dumps)
> and the existing desktop-class motherboard is maxed out for that.
>
> AB
>
>
>
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