On 08/22/2017 11:06 AM, Phil Stracchino wrote: > Ah, well now you're talking about a different issue. Because that's not > really a virtual-tape-on-disk problem. That's now a removable-storage > problem.
Well, a tape is both. You can put a disk in a drive, fill it up with bytes, write an EOT in the last block and call it a tape. It's a bit inconvenient when its an 8TB "tape". > I actually have not tried the current generation of removable disk > technology (Tandberg RDX or similar), but I'd like to, budget > permitting, because I'm getting awfully tired of LTO tape. I expect it > to become more and more feasible and cost-effective as the cost of flash > storage continues to drop. (I've never been much of a fan of the idea > of removable spinning-rust as backup media, because you only have to > drop it once...) We're using plain SATA drives in hot-swap bays. With vchanger they work just fine for backup -- we haven't tried restoring anything from an already removed disk yet -- but they do die on you even without dropping 'em. So I've a post-backup script that figures out which of the vchanger "magazines" is the "current" one and rsyncs it to anther drive. That way if a drive dies during write, I lose at most the latest backup. There is a number of obvious problems with that, and here's a non-obvious one: instead of filling them up strictly sequentially, every once in a while bacula randomly decides to write a volume in some other magazine. At which point my clever script works exactly as designed... -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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