On Mar 11, 2016, at 7:14 PM, Heitor Faria <heitor AT bacula.com DOT br> wrote:

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.