> On 11/03/16 20:14, Simon Templar wrote:
>> In my case using spooling didn’t prevent shoe-shining; it just introduced
>> long
>> pauses while data was spooled. I think all this means is that I can read from
>> my data sources faster than my tape can write.
> Unless you are using DAT, do not use mechanical drives for spooling - they
> can't
> keep up with the tape drive unless you're using one that's dedicated and only
> spooling/despooling for a single job (LTO1-2-3, incompressible data) or can't
> keep up at all (As above with any form of compressible data, or LTO4,5,6,7)
Hello Alan: I have the same perception.
> SSD is the only way to fly. After having tested with a PCIe NVMe drive, I'd
> say
> that's preferred, but a _fast_ SATA2/3 or SAS2 drive will work too (The old
> spool was a stripe of Intel SLC SSDs, the new one is a DC3700 card)
I never got this spooling / disk backup fetish. I mean: it keeps data
interleaving to happen, but at what cost?
With SSD you can have a ridiculous hight throughput, but you still need to wait
backup data being copied to tapes / definitive slow disk. Unless you have a
really short backup window at client size, it is useless.
> Spooling really comes into its own when you're running multiple jobs. Whilst
> one
> job is despooling, others can be spooling. The interleaving effect means all
> your jobs complete in a faster period of time.
Again I agree with you here. You will tend to have more optimum spooling usage
in this scenario if you have enough spooling size.
Regards,
--
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