Hi all,

during last weeks I did interesting findings at one of production LTO
3583-L18 library. There are 2 drives and both was changed past series of
media faults (one of them twice) past about 1 year of operation. We have
about 20 "historicaly touched" tapes with average 3-4 write faults. Media
faults are still repeated and my finding is all that faults were done at
70-75% of estimated capacity (set by longterm using to 105GB, we use client
compression) during filling the tape. It seems like all tapes were corrupted
nearly at the same place, of course there is some diffusion because this is
only estimated filling. Faults at these tapes are repeatedly occured at
these percents of max capacity.

I understand when one tape has media fault repeatedly at the same place, but
about 20 tapes? Could it mean that all tapes were corrupted by one bad drive
at the same place, or can be reason at microcode?

We are in contact with our IBM support to solve it, but I am interested if
anybody of you register similar phenomenon?

Tomas