Don't know if its relevant, but I've got an LTO5/juke and it dropped in both speed and capacity. I'm now trying to remember if I had the host ESAS card replaced, or the I/O module in the juke...
On Wed, Mar 12, 2014 at 12:28:33PM -0400, Jon LaBadie wrote: > On Wed, Mar 12, 2014 at 02:38:48PM +0000, Dave Ewart wrote: > > Hello, > > > > Four years ago I deployed a pair of Tandberg LTO-5 Ultrium (SAS) tape, > > connected a Dell PowerEdge server via a Dell H200 SAS controller. > > > > At that time ran the amtapetype utility which produced this output: > > > > define tapetype Tandberg-LTO5 { > > comment "Tandberg LTO5 1500/3000, produced by tapetype prog (hardware > > compression off)" > > length 1410 gbytes > > filemark 0 kbytes > > speed 125762 kps > > } > > > > (That was created by an older version of AMANDA, which we were using at > > the time: probably from Debian/Lenny, which was version 2.5.2p1, I > > believe) > > > > These tapes are native 1.5TB and so that looks pretty reasonable. We've > > never used these tapes to their fullest capacity and all was fun and > > shiny until recently when the tapes reported "No space left on device". > > However, the concerning thing is that the tapes reported 'full' at less > > than what I was expecting as full capacity, just above 1.1TB in fact. > > This means that our backup space 'growth', which I had been assuming was > > only 75%/80% full is in fact at 100%! > > > > I re-ran the tapetype utility from our current AMANDA (version 2.6.1p2-3 > > from Debian/Squeeze) and it showed this: > > > > define tapetype unknown-tapetype { > > comment "Created by amtapetype; compression disabled" > > length 1148746080 kbytes > > filemark 0 kbytes > > speed 69815 kps > > blocksize 32 kbytes > > } > > > > > > The length reported here is ~1.1TB which ties up with the "no space left > > on device" message, but ... > > > > ... these are genuine LTO-5 (Tandberg brand) tapes - just like > > http://img.misco.eu/Resources/images/Modules/InformationBlocks/1210/TAN/TAN-2/202175-tandberg-LTO-5-tape-cartridge-small.jpg > > - and the second tapetype above was created using a previously-unused > > tape and they really are 1.5TB native! > > > > What's going on? Why am I not getting to use the full capacity?? > > > > A guess only. > > I note the measured speed has dropped by 45%. Due to what I haven't a clue, > but maybe some hardware change or cables or ??? > > Perhaps your system's ability to feed the drive has dropped below the > minimum needed to keep the drive streaming. In that case, the drive > must "shoe-shine" and each restart costs a bit of tape. > > Jon > -- > Jon H. LaBadie j...@jgcomp.com > 11226 South Shore Rd. (703) 787-0688 (H) > Reston, VA 20190 (609) 477-8330 (C) --- Brian R Cuttler brian.cutt...@wadsworth.org Computer Systems Support (v) 518 486-1697 Wadsworth Center (f) 518 473-6384 NYS Department of Health Help Desk 518 473-0773