On 06/08/2015 01:13 PM, Alan Brown wrote:
> On 08/06/15 15:58, Dimitri Maziuk wrote:
>> On 2015-06-08 05:25, Denis Witt wrote:
>>
>>> I'm using normal (7.200 RPM) HDDs. But, as pointed out in
>>> my mail, there is only one job running ("despooling Attributes") at the
>>> moment. All other jobs are still waiting for execution ("waiting on
>>> max storage jobs").
>>
>> Did you see my "Fixed: Re: concurrent jobs not working?" post from 4
>> days ago? Take a look.
> 
> The problem with adding more concurrent jobs (up from one) is that the 
> increased seek load will badly affect despooling time.

(Yes but before he gets there "waiting on max storage jobs" is exactly
what I had.)

> 5: A good datacenter SSD will replace a bunch of spindles because it has 
> virtually no seek penalties, plus decent write speeds. Datacentre SSDs 
> continue to perform well under heavy random r/w load. Consumer ones 
> don't - the write speeds suffer particularly badly and cheap consumer 
> SSD used to have slower sequential write performance than spinning 
> media, often falling to kB/s write speeds under random load (it's better 
> now but still often falls apart quickly under heavy load)

I'm yet to see that on our evos and mushkins, however

> My current spool area is a 6-way raid0 of Intel X25E drives. These feed 
> 7 LTO5 drives via FC  with the limiting factor being the 8Gb/s FC 
> connections out of the bacula-sd box. Over the last 5 years that's 
> worked pretty well at keeping up but I still get shoeshining from time 
> to time.

my shops are a bit smaller than yours.

And we ditched tape when sony ditched lto. We decided that crates of
dlts and boxes of ltos and a few scattered dds/dats are quite enough. So
I'm despooling to spinning rust @ 2-300MB/s.

-- 
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu

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