Both of those things would have to be futures and require discussion - the very 
original version cleared stats on a device open but I got asked to keep it the 
stats cumulative so they would be more similar to disk stats. I'm not sure 
about the bad reads idea I'd have to look and see if some other layer provided 
device error information. I've got some changes to make and don't want to 
change it into a moving target that needs more discussion at this point.

-----Original Message-----
From: Dale R. Worley [mailto:wor...@alum.mit.edu] 
Sent: Monday, February 09, 2015 4:08 AM
To: Seymour, Shane M
Cc: linux-scsi@vger.kernel.org
Subject: Re: [PATCH] st: implement sysfs based tape statistics v2

One feature of tape statistics is that they're as much about the *tape* as they 
are about the *drive*, which is uncommon for block devices.  It might be useful 
to have a set of counters which is cleared every time a new tape is inserted 
into the drive.  In particular, "bad reads since this tape was inserted" would 
be very useful for monitoring the quality of tapes.

Dale
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