On 12/03/16 00:14, Heitor Faria wrote: > >> 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.
If you use tape, you need spooling on (fast) SSD. If you don't need to use tape then spooling is superfluous. Because of the cost of drives, tape is only worth using once you pass about 1-200TB or so needing to be backed up (or several hundred small systems) and at that point you're going to want multiple simultaneous backups anyway. Don't bother with DAT for backups. It's not reliable due to the narrow tape format. Any minor defect in the substrate translates to a major loss and in any case it's too small to be worth the hassle in comparison to using solid state storage. Apart from DAT and LTO/3592/T10000D every other tape format is now abandonware so there's not much point in persisting with them and even IBM is looking at dropping 3592 in favour of LTO. I wouldn't be at all surprised to find Oracle announcing that T10000 format is end of life soonish too. The tape market is too small to support 3 competing half inch formats even if 3592 and T10000D are twice the capacity of LTO7 (the cost of cartridges is a lot more than twice as much as LTO7, as are the drives, so there's no financial incentive to use them in new installations.) Caveat: BDXL is up to 120GB per disc (quad layer) and It _may_ be worth investigating this format for backups, but bacula doesn't play nicely with optical media. HVD development (6TB per disc) was abandoned in 2008. Ritek demonstrated 250GB BDXL discs (10 layer) 8 years ago but they've never been marketed. Ditto with Pioneer's 400GB BDXL format and the "1TB Blueray" disk is now 4 years past proposed launch date. What's killed all these "smaller" formats is cheap(ish) HDD/SSDs, cloud storage and the likes of Netflix. That's despite even BDXL 120GB not being large enough capacity to hold a complete 4k video title. ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users