Gene, I had no idea it was that difficult to reset.
I apologize if I left the impression that I thought it was an amanda issue, I was sure it was in the HW and the driver, but I didn't express. In truth I seldom touch a drive for other amanda amanda related work, only when assisting an end-user backing up their own data or installing a new drive for an end-user use. On Fri, Mar 05, 2010 at 01:30:43PM -0500, Gene Heskett wrote: > On Friday 05 March 2010, Brian Cuttler wrote: > >Rory, > > > >I may be wrong, nor my information obsolete for your tapedevice > >but I seem to recall that if you want to actually turn off compression > >you have to also relabel the tape. If it sees the amlabel was > >written in compessed mode... > > > Yes, back when I was using tape, that was a major problem, so much so that I > finally read the first block of a new, but labeled, uncompressed tape, then > used dd to write that first block to every tape on the premises, then > forcibly relabeled them for my system. A certified PIMA... Then I bought > another case of tape from ebay, they looked new, cello wrap & the whole > maryann, but they weren't, and the whole scene had to be repeated, its a > darned virus I think. > > This BTW, is not an amanda problem, its 100% the drive, it reads its own > hidden header data while 'recognizing' or 'accepting' the tape, and sets the > compression according to what it finds. So that gets reset to match the tape > any time you do a rewind, so you must do the rewind, and THEN issue the > compression off command, through mtx I think it was, and then, without > accessing the drive, write the uncompressed first block. Never give it a > chance to re-read that block until its done writing the new one.. > > > >On Fri, Mar 05, 2010 at 12:21:32PM -0500, rory_f wrote: > >> Dustin J. Mitchell wrote: > >> > On Fri, Mar 5, 2010 at 9:17 AM, rory_f <amanda-forum < at > > backupcentral.com> wrote: > >> > > i'm doing a tape run now, using the original tapetype definition, and > >> > > it has filled a tape to around 238gb and moved onto the next one > >> > > (well it has changed tapes,it's still waiting to write to tape) > >> > > > >> > > is this normal? > >> > > >> > Amanda treats any error from the tape drive as EOT. It's the nature > >> > of UNIX kernel drivers that they don't give much more information than > >> > that. So it's quite possible that your tape drive is failing, or the > >> > tapes are failing, and intermittent errors are causing the early EOT > >> > indication. > >> > > >> > Alternately, maybe the earlier amtapetype run was made with hardware > >> > compression on? The size is about double.. > >> > > >> > Dustin > >> > >> I made sure to turn compression off and also the output of the tapetype > >> didn't mention compression was on - it normally does if it detects > >> compression, right? > >> > >> Perhaps compression is turned on elsewhere - im not sure where though. So > >> you think what is happening is the kernel thinks these tapes are only > >> 200~gb and giving an EOT to amanda - when infact they are 400gb LTO3 > >> tapes. > >> > >> I doubt the tapes are failing - but i mean it is possible, i've used the > >> same type of tapes for over 400 tapes with amanda and never seen this > >> issue. > >> > >> I'm guessing then it's the drive itself.. there's no real way to tell. > >> This is our second tape drive, the one we have used more consistantly > >> with Amanda is out being replaced as it died, too :/ > >> > >> I'll run a amtapetype again to make sure, i guess. > >> > >> +---------------------------------------------------------------------- > >> > >> |This was sent by r...@mrxfx.com via Backup Central. > >> |Forward SPAM to ab...@backupcentral.com. > >> > >> +---------------------------------------------------------------------- > > > >--- > > 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 > > > > > > > >IMPORTANT NOTICE: This e-mail and any attachments may contain > >confidential or sensitive information which is, or may be, legally > >privileged or otherwise protected by law from further disclosure. It > >is intended only for the addressee. If you received this in error or > >from someone who was not authorized to send it to you, please do not > >distribute, copy or use it or any attachments. Please notify the > >sender immediately by reply e-mail and delete this from your > >system. Thank you for your cooperation. > > > > > -- > Cheers, Gene > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > > You are as I am with You. --- 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 IMPORTANT NOTICE: This e-mail and any attachments may contain confidential or sensitive information which is, or may be, legally privileged or otherwise protected by law from further disclosure. It is intended only for the addressee. If you received this in error or from someone who was not authorized to send it to you, please do not distribute, copy or use it or any attachments. Please notify the sender immediately by reply e-mail and delete this from your system. Thank you for your cooperation.
