ADSM-L

Re: DLT Clean problem

2001-05-02 12:00:34
Subject: Re: DLT Clean problem
From: "Chibois, Herve" <Chibois_H AT ADMIRAL DOT FR>
Date: Wed, 2 May 2001 17:37:54 +0200
Hi Justino,

Why don't you use the library autoclean functionality, it's simpler and
moreover it won't use one slot in your 9740 as the cleaning slot is not
visible for TSM ?

rv


> -----Message d'origine-----
> De : Justino Costa [mailto:justino.costa AT EDINFOR.EDP DOT PT]
> Envoyé : mercredi 2 mai 2001 16:41
> À : ADSM-L AT VM.MARIST DOT EDU
> Objet : DLT Clean problem
> 
> 
> Hi all,
> 
> I was wondering if some of you has had the following problem:
> 
> --What we have:
> 
> *) Storagetek 9740 with V1?????????????????
> *) 5 DLT7000 Drives with V115
> *) Sun Solaris 2.6 runing TSM V4.1.2.0
> *) Autoclean is disabled on the library
> *) TSM as "cleaning frequency" on all drives configure to "asneeded".
> 
> --What happens:
> 
> 1) When a drive turns on the "Cleaning Required" led, TSM 
> doesn't receive
> any indication (or does not report it on the actlog ?) and 
> therefore, it
> doesn't clean the drive.
> 
> 2) In fact, TSM continues to read and/or write to the same tape or to
> another tape loaded afterwards, although the drives's clean 
> led remains on.
> 
> 3) Then, after a while, the drive reachs a point where it 
> cannot read or
> write anymore to a tape. When this happens, TSM gives the 
> following error:
> 
> 2001-04-29 19:20:05
> ANR8302E I/O error on drive DRIVE_0 (/dev/rmt/7mt)  (OP=READ, CC=422,
> KEY=03, ASC=80, ASCQ=01,
> SENSE=F0.00.03.00.00.00.00.16.00.00.8D.28.80.01.00.00.00.00.81
> .03.00.00.00.00.00.00.00.00.00.,
> Description=An undetermined error has occurred).  Refer to 
> Appendix D in
> the 'Messages' manual for recommended action.
> 
> Which also appears on solaris syslog:
>   "unix: WARNING: [email protected],0: 
> scsi_cmd=8,errno=110,cc=422,sense=f0  0  3  0  0
> 0  0 16  0  0 8d 28 80  1  0  0  0  0 81  3 ^ "
> 
> 4) TSM now cleans the drive but only after  the ANR8302E message:
> 
> 2001-04-29 19:20:05      ANR8914I Drive DRIVE_0 
> (/dev/rmt/7mt) in library
> STK9740_2 needs to be cleaned.
> 2001-04-29 19:23:37      ANR8906I Cleaning drive DRIVE_0 
> (/dev/rmt/7mt) in
> library STK9740_2.
> 2001-04-29 19:34:13      ANR8908I CLEAN DRIVE for drive DRIVE_0
> (/dev/rmt/7mt) in library STK9740_2 completed successfully.
> 
> 
> --The problem:
> 
> Due to the ANR8302E, any operation that was using that 
> tape/drive fails. If
> the operation that failed had been, for example, a 
> reclamation process,
> there shouldn't be a problem because we can allways restart a 
> reclamation
> process.
> 
> However, if the operation that abort had been, for example, a 
> TDPOracle
> backup of a huge Database, then this is a problem because the 
> backup will
> fail and it will have to start all over again.
> 
> There is also another problem. Due to the several clean 
> erros, some tapes
> are now unreadable and we already lost some. I managed to 
> recover some with
> "restore volume" command but, there were other that I couldn't recover
> because the readings kept failing, precisely when they were 
> being copied to
> a  copy pool.
> 
> 
> --The simple question:
> 
> Why doesn't TSM cleans the drive right after the drive's 
> clean led turns ON
> ?
> 
> 
> Thank you very much,
> Justino Miguel Costa
> Edinfor - Unix Team
> justino.costa AT edinfor.edp DOT pt
> 
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