You need to make sure you're on the lastest microcode for your 3570 drives.  
There were some reported problems about bad microcode...I've experienced same 
problems with i/o errors and vcr data repair.  Problems went away after last 
microcode update.  I had experienced this problem for a solid month on a daily 
basis...

Good Luck

Larry

Larry Way
SL09/100D
408-743-4242  voice
408-743-4201  fax

>>> CABANL AT MAIL.MODOT.STATE.MO DOT US 02/28/00 08:38AM >>>
Has anyone already written a dsmadmc sql select query for "bad" tapes??  If so,
would you *please* share?

Also, out of curiosity, how do ya'll handle your tapes' life cycle?  I have 10
locations with 3575 libraries, B model drives,  using the Magstar MP tapes.
Have you written scripts to keep track of usage, and to determine when to
"sunset" some of the harder working tapes?  Does anyone *really* take IBM at
it's word on the 10-year usability on the tapes?  Our systems are three yrs old
now, with the vast majority of tapes being that old also.  I have noticed a
trend of increasing i/o errors, repairing VCR data, and read/write errors.  The
CE's keep giving the drives a clean bill of health, but the bottom line is: I
have been loosing data!

The voices of those more experienced in the ways of proper tape media management
(vague Monty Pyton reference) are encouraged to apply!

thanks !
Lisa