Re: LTO don't need clean up? WARNING!!!
Hi guys. You need to know this! DONT USE HP CLEANING TAPES ON IBM DRIVES. a LTO guru at IBM told me this. That they found out that ther is some other cemiclas on the cleaning tapes form HP than in the IBM tapes. therefore they say that you can destroy your drives by using HP cleaning tapes on IBM Lienar Tape Open drives. Kvedja/Regards Petur Eythorsson Taeknimadur/Technician IBM Certified Specialist - AIX Tivoli Storage Manager Certified Professional Microsoft Certified System Engineer [EMAIL PROTECTED] Nyherji Hf Simi TEL: +354-569-7700 Borgartun 37105 Iceland URL:http://www.nyherji.is -Original Message- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Tomas Hrouda Sent: 5. juni 2002 06:10 To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? Sure, my cleaning cartridge is labeled CLNI64L1 ... and it is in library inventory. My premise was using of TSM automated cleaning method with CLEANFREQ=ASNEEDED. This way I can track number of clenanings left on cartridge. In case of library-automated method (you mentioned Zlatko), can I track this parameter too? Will be CLENANINGSLEFT number lowered i my library volumes inventory? If not, can I use TSM-automated method anyway? Tom -Original Message- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Zlatko Krastev/ACIT Sent: Wednesday, June 05, 2002 7:41 AM To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? If you read carefully library maintenance manual you would find that library requires a cartridge with specific label (starting with CLNI, i.e. CLNI39 is the one I've used last week) and performs cleaning automatically. So set CLEANFREQ=NONE as Mark pointed. Those of you WITH 3584 may have overlooked that base frame is with 141-281 slots according to IBM Announcement but capacity is 14-28TB, not 14.1-28.1. This is again due to one slot occupied by cleaning cartridge for library automatic cleaning. Zlatko Krastev IT Consultant Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by:"ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject:LTO don't need clean up? Hi all, one of LTO 3583 (2 drives) we take care of still didn't clean drives. It is operate from january 2002 and there is about 10-20 GB daily data flow through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED cleaning frequency, but no clean occured from january (!!), no dirty drive signalized on display ... is it possible? LTO box is placed in climatized dust-free environment, but .??? Has anyone some similar experience with LTO clean frequency? Tom
Re: LTO don't need clean up?
Of course, cleaner tape is present in library inventory, I have checked it with CHECKIN LIBVOLUME library SEARCH=BULK STAT=CLEANER CLEANINGS=50 ... I think it is OK. Tom -Original Message- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Mark Stapleton Sent: Tuesday, June 04, 2002 1:25 PM To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Toma9 Hrouda > one of LTO 3583 (2 drives) we take care of still didn't clean > drives. It is > operate from january 2002 and there is about 10-20 GB daily data flow > through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED > cleaning frequency, but no clean occured from january (!!), no dirty drive > signalized on display ... is it possible? LTO box is placed in climatized > dust-free environment, but .??? Has anyone some similar > experience with > LTO clean frequency? IBM LTO libraries clean themselves; you shouldn't be using TSM to schedule cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=570001038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
Re: LTO don't need clean up?
Sure, my cleaning cartridge is labeled CLNI64L1 ... and it is in library inventory. My premise was using of TSM automated cleaning method with CLEANFREQ=ASNEEDED. This way I can track number of clenanings left on cartridge. In case of library-automated method (you mentioned Zlatko), can I track this parameter too? Will be CLENANINGSLEFT number lowered i my library volumes inventory? If not, can I use TSM-automated method anyway? Tom -Original Message- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Zlatko Krastev/ACIT Sent: Wednesday, June 05, 2002 7:41 AM To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? If you read carefully library maintenance manual you would find that library requires a cartridge with specific label (starting with CLNI, i.e. CLNI39 is the one I've used last week) and performs cleaning automatically. So set CLEANFREQ=NONE as Mark pointed. Those of you WITH 3584 may have overlooked that base frame is with 141-281 slots according to IBM Announcement but capacity is 14-28TB, not 14.1-28.1. This is again due to one slot occupied by cleaning cartridge for library automatic cleaning. Zlatko Krastev IT Consultant Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by:"ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject:LTO don't need clean up? Hi all, one of LTO 3583 (2 drives) we take care of still didn't clean drives. It is operate from january 2002 and there is about 10-20 GB daily data flow through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED cleaning frequency, but no clean occured from january (!!), no dirty drive signalized on display ... is it possible? LTO box is placed in climatized dust-free environment, but .??? Has anyone some similar experience with LTO clean frequency? Tom
Re: LTO don't need clean up?
If you read carefully library maintenance manual you would find that library requires a cartridge with specific label (starting with CLNI, i.e. CLNI39 is the one I've used last week) and performs cleaning automatically. So set CLEANFREQ=NONE as Mark pointed. Those of you WITH 3584 may have overlooked that base frame is with 141-281 slots according to IBM Announcement but capacity is 14-28TB, not 14.1-28.1. This is again due to one slot occupied by cleaning cartridge for library automatic cleaning. Zlatko Krastev IT Consultant Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by:"ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject:LTO don't need clean up? Hi all, one of LTO 3583 (2 drives) we take care of still didn't clean drives. It is operate from january 2002 and there is about 10-20 GB daily data flow through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED cleaning frequency, but no clean occured from january (!!), no dirty drive signalized on display ... is it possible? LTO box is placed in climatized dust-free environment, but .??? Has anyone some similar experience with LTO clean frequency? Tom
Re: LTO don't need clean up?
Becky, I've had similar experience. We send about 100 GB / day to our 3583 (4 drives). As far as I know no drive has ever cleaned itself. The library has been in service since last October. But in general, drive cleanings are rare on our system. We have a mix of 3570, LTO, and DLT media and I see 1-2 drive cleaning events per month on the average. That's across a total of 16 drives. And we too have had two LTO drives replaced because of tapes stuck in them. And I mean SERIOUSLY stuck! The local CE disassembled the first drive that jammed and still couldn't remove the tape! Tab Trepagnier TSM Administrator Laitram Corporation "Davidson, Becky" <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 06/04/2002 09:02:40 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Re: LTO don't need clean up? I have had the same concern. I also have had two drives replaced because tapes were stuck. It is an interesting theory...instead of fixing the drive when a tape is stuck they just replace it. Definitely different from the 3590s. Becky -Original Message- From: Kauffman, Tom [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 04, 2002 8:48 AM To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? Got to admit I've been wondering about this myself. I've a 3584 library with 10 LTO drives that has been in service since September of last year. I've got three cleaning tapes in the library, I move 130 GB of data per day -- and I haven't seen a cleaning tape used yet. I know the drives and tapes are supposed to be self-cleaning, but this is almost to good to be true. OTOH, I haven't run into any errors that indicate dirty drives. . . Tom Kauffman NIBCO, Inc > -Original Message- > From: Mark Stapleton [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 04, 2002 6:25 AM > To: [EMAIL PROTECTED] > Subject: Re: LTO don't need clean up? > > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On > Behalf Of Tomá? Hrouda > > one of LTO 3583 (2 drives) we take care of still didn't clean > > drives. It is > > operate from january 2002 and there is about 10-20 GB daily > data flow > > through each drive, 3-5 daily tape-mounts. Both drives are > set to ASNEEDED > > cleaning frequency, but no clean occured from january (!!), > no dirty drive > > signalized on display ... is it possible? LTO box is placed > in climatized > > dust-free environment, but .??? Has anyone some similar > > experience with > > LTO clean frequency? > > IBM LTO libraries clean themselves; you shouldn't be using > TSM to schedule > cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at > > > http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=5700 01038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
Re: LTO don't need clean up?
I have had the same concern. I also have had two drives replaced because tapes were stuck. It is an interesting theory...instead of fixing the drive when a tape is stuck they just replace it. Definitely different from the 3590s. Becky -Original Message- From: Kauffman, Tom [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 04, 2002 8:48 AM To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? Got to admit I've been wondering about this myself. I've a 3584 library with 10 LTO drives that has been in service since September of last year. I've got three cleaning tapes in the library, I move 130 GB of data per day -- and I haven't seen a cleaning tape used yet. I know the drives and tapes are supposed to be self-cleaning, but this is almost to good to be true. OTOH, I haven't run into any errors that indicate dirty drives. . . Tom Kauffman NIBCO, Inc > -Original Message- > From: Mark Stapleton [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 04, 2002 6:25 AM > To: [EMAIL PROTECTED] > Subject: Re: LTO don't need clean up? > > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On > Behalf Of Tomáš Hrouda > > one of LTO 3583 (2 drives) we take care of still didn't clean > > drives. It is > > operate from january 2002 and there is about 10-20 GB daily > data flow > > through each drive, 3-5 daily tape-mounts. Both drives are > set to ASNEEDED > > cleaning frequency, but no clean occured from january (!!), > no dirty drive > > signalized on display ... is it possible? LTO box is placed > in climatized > > dust-free environment, but .??? Has anyone some similar > > experience with > > LTO clean frequency? > > IBM LTO libraries clean themselves; you shouldn't be using > TSM to schedule > cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at > > > http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=5700 01038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
Re: LTO don't need clean up?
Does this apply to 3583's (or just 3584's). On our 3583 "autoclean" is disabled and I don't see any way to enable it. When I've asked IBM h/w support they said it can't be enabled for 3583 and that you should use host cleaning (ie library will tell TSM when to clean.) We've been running a 3583 since last August with 2 drives (another drive added in Novemeber). No cleanings have been done. Even when I tried to force a cleaning I don't think it actually did one (said it completed in seconds). I've found the following info on cleaning: "Note: If you insert a cleaning cartridge when the drive does not need to be cleaned or if you insert a cleaning cartridge that has expired, the drive will automatically eject the cartridge." (I'm assuming that was what happened to me - I issued a clean drive command, it said it worked but was way to quick - seconds!) " Integrated head cleaner The head of the drive must be kept clean to prevent errors caused by contamination. During the load process a brush, integrated in the drive mechanism, cleans the head before it is used with the tape. This keeps head and media free of debris on a continuing basis and is expected to lead to less requirement for drive cleaning operations." "Cleaning the drive In addition to the integrated head cleaning mechanism, IBM recommends that the drive be cleaned regularly, with automatic cleaning enabled where supported in the libraries. By continually keeping itself clean, the drive does not shut itself down because of improper maintenance or contaminants that cause the drive to fail. In the unusual occurrence that the drive head becomes clogged, it may be necessary to use the specially labeled IBM LTO Ultrium cleaning cartridge supplied with each Ultrium tape drive product. The cleaning cartridge is good for 50 cleaning operations. Note: The use of cleaning cartridges is not necessary (and is discouraged) for the normal operation of Ultrium tape drives. See LTO 3580 Tape drive Operator Guide, GA32-0415, for more information on drive cleaning. If cleaning proves necessary, the LTO-CM memory in a cleaning cartridge is used to track the number of times that the cartridge has been used. If the cartridge has already been used 50 times, the drive will mark the cleaning cartridge as expired. This also protects you from accidentally reinserting a cleaning cartridge that has been used 50 times." "IBM's 3580 tape drive employs particle elimination techniques before each start-up to help keep the heads free of dust. A head cleaner, integrated in the tape drive, uses a brush to clean the head during the load process before the tape passes over the area. Nevertheless, the drives may still require occasional cleaning with a cleaning cartridge." IBM support also told me once that when using new LTO cartridges it is basically like cleaning the drive (of course another support person told me that using new cartridges may require more cleaning of the drives). We bought 10 cleaning carts - haven't done one cleaning yet - I think they'll last until I retire! (15 or so years). Tim Rushforth City of Winnipeg -Original Message- From: Mark Stapleton [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 04, 2002 6:25 AM To: [EMAIL PROTECTED] Subject: Re: LTO don't need clean up? From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Tomáš Hrouda > one of LTO 3583 (2 drives) we take care of still didn't clean > drives. It is > operate from january 2002 and there is about 10-20 GB daily data flow > through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED > cleaning frequency, but no clean occured from january (!!), no dirty drive > signalized on display ... is it possible? LTO box is placed in climatized > dust-free environment, but .??? Has anyone some similar > experience with > LTO clean frequency? IBM LTO libraries clean themselves; you shouldn't be using TSM to schedule cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=570001038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
Re: LTO don't need clean up?
Mark Stapleton <[EMAIL PROTECTED]> schrieb:
> From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On
> Behalf Of Tomá¹ Hrouda
> > one of LTO 3583 (2 drives) we take care of still didn't clean
> > drives. It is
> > operate from january 2002 and there is about 10-20 GB daily data flow
> > through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED
> > cleaning frequency, but no clean occured from january (!!), no dirty drive
> > signalized on display ... is it possible? LTO box is placed in climatized
> > dust-free environment, but .??? Has anyone some similar
> > experience with
> > LTO clean frequency?
> IBM LTO libraries clean themselves; you shouldn't be using TSM to schedule
> cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at
> http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=570001038&aid=1
This URL yields an empty document. You probably meant it to be
http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=S7000103&aid=1
Anyway, on page 86 this document states:
"Whenever a drive requires cleaning, it alerts you with a message on the
library operator panel or host console.
...
Host cleaning
Host/Application maintained and activated is the default condition. Host
cleaning enables the server to detect the need to clean an Ultrium Tape
Drive and to control the cleaning process. The cleaning cartridge must be
stored in one of the available storage slots within the library. For more
information, see the section about cleaning in your application software
documentation.
Manual cleaning
Manual cleaning requires that you use the Move Media command from the
library s operator panel to insert a cleaning cartridge into the library
to perform cleaning on one or more of the Ultrium Tape Drives (see Move
Media Dialog on page 106). "
To me this means, that you
- either watch the library's operator panel, and response to a drive's need to be
cleaned by inserting a cleaning cartrige and using the
Move Media Dialog,
- or let the application software, i.e. TSM, control the cleaning.
I strongly prefer the second method. And I'm sharing Tomá¹ Hrouda's
concerns: Our 3583, which is in production since Feb. 2001 and
currently receives about 60 GB data per night, has never cleaned a
drive, at least according to the "Cleanings Left" number yielded by
"QUERY LIBVOL". I just started a cleaning cycle by hand ("CLEAN DRIVE"),
just to verify that this changes the "Cleanings Left" number. It does.
--
Reinhard MerschWestfaelische Wilhelms-Universitaet
Zentrum fuer Informationsverarbeitung - ehemals Universitaetsrechenzentrum
Roentgenstrasse 9-13, D-48149 Muenster, Germany Tel: +49(251)83-31583
E-Mail: [EMAIL PROTECTED] Fax: +49(251)83-31653
Re: LTO don't need clean up?
Got to admit I've been wondering about this myself. I've a 3584 library with 10 LTO drives that has been in service since September of last year. I've got three cleaning tapes in the library, I move 130 GB of data per day -- and I haven't seen a cleaning tape used yet. I know the drives and tapes are supposed to be self-cleaning, but this is almost to good to be true. OTOH, I haven't run into any errors that indicate dirty drives. . . Tom Kauffman NIBCO, Inc > -Original Message- > From: Mark Stapleton [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 04, 2002 6:25 AM > To: [EMAIL PROTECTED] > Subject: Re: LTO don't need clean up? > > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On > Behalf Of Tomáš Hrouda > > one of LTO 3583 (2 drives) we take care of still didn't clean > > drives. It is > > operate from january 2002 and there is about 10-20 GB daily > data flow > > through each drive, 3-5 daily tape-mounts. Both drives are > set to ASNEEDED > > cleaning frequency, but no clean occured from january (!!), > no dirty drive > > signalized on display ... is it possible? LTO box is placed > in climatized > > dust-free environment, but .??? Has anyone some similar > > experience with > > LTO clean frequency? > > IBM LTO libraries clean themselves; you shouldn't be using > TSM to schedule > cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at > > > http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=5700 01038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
Re: LTO don't need clean up?
I am also reading and writing 150GB of data veryday to 3 drives for about 6 months. I havent seen any cleaning cartd. is used. regards, Burak [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 04.06.2002 17:09 Please respond to ADSM-L To: [EMAIL PROTECTED] cc: Subject: Re: LTO don't need clean up? Got to admit I've been wondering about this myself. I've a 3584 library with 10 LTO drives that has been in service since September of last year. I've got three cleaning tapes in the library, I move 130 GB of data per day -- and I haven't seen a cleaning tape used yet. I know the drives and tapes are supposed to be self-cleaning, but this is almost to good to be true. OTOH, I haven't run into any errors that indicate dirty drives. . . Tom Kauffman NIBCO, Inc > -Original Message- > From: Mark Stapleton [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, June 04, 2002 6:25 AM > To: [EMAIL PROTECTED] > Subject: Re: LTO don't need clean up? > > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On > Behalf Of Tomá? Hrouda > > one of LTO 3583 (2 drives) we take care of still didn't clean > > drives. It is > > operate from january 2002 and there is about 10-20 GB daily > data flow > > through each drive, 3-5 daily tape-mounts. Both drives are > set to ASNEEDED > > cleaning frequency, but no clean occured from january (!!), > no dirty drive > > signalized on display ... is it possible? LTO box is placed > in climatized > > dust-free environment, but .??? Has anyone some similar > > experience with > > LTO clean frequency? > > IBM LTO libraries clean themselves; you shouldn't be using > TSM to schedule > cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at > > > http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=5700 01038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
Re: LTO don't need clean up?
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Tomáš Hrouda > one of LTO 3583 (2 drives) we take care of still didn't clean > drives. It is > operate from january 2002 and there is about 10-20 GB daily data flow > through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED > cleaning frequency, but no clean occured from january (!!), no dirty drive > signalized on display ... is it possible? LTO box is placed in climatized > dust-free environment, but .??? Has anyone some similar > experience with > LTO clean frequency? IBM LTO libraries clean themselves; you shouldn't be using TSM to schedule cleanings. Set your tape drives to CLEANFREQ=NONE and RTM at http://www-1.ibm.com/support/manager.wss?rt=4&org=ssg&doc=570001038&aid=1 The trick is that you have to insert the cleaner cartridge into the library through the I/O station on the door of the library by using the MOVE MEDIA command that you run from the front panel of the library. (Not to be confused with TSM's MOVE MEDIA command.) -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MSCE
LTO don't need clean up?
Hi all, one of LTO 3583 (2 drives) we take care of still didn't clean drives. It is operate from january 2002 and there is about 10-20 GB daily data flow through each drive, 3-5 daily tape-mounts. Both drives are set to ASNEEDED cleaning frequency, but no clean occured from january (!!), no dirty drive signalized on display ... is it possible? LTO box is placed in climatized dust-free environment, but .??? Has anyone some similar experience with LTO clean frequency? Tom
