> On Mar 11, 2016, at 7:14 PM, Heitor Faria <hei...@bacula.com.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.
I backup to disk, then copy to tape later. This way I have backups on disk and tape. Restoring from disk is faster than restoring from tape. It is quite useful. -- Dan Langille - BSDCan / PGCon d...@langille.org
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