Hello Kern,
On Feb 28, 2006, at 3:19 AM, Kern Sibbald wrote:
In fact, the output that I saw seemed to me to be non-fatal
What do you suppose worst-case scenario is here -- that roughly 64512
bytes may be lost at the end of the tapes?
My best guess is a tape defect. If it happens with more than one
tape, either you have a bad batch of tapes, or you have a defective
drive or
the logical end of tape reader head is dirty.
Bad tapes might be the problem, as this not only happens with more
than one tape, but it happens with more than one drive. One other
thing I just noticed after you pointed it out is that '-1' is
returned every time I reach the end of the tape, though quite often
bacula reports success so I hadn't noticed...
26-Feb 11:13 sbgrid-sd: End of Volume "000032L1" at 148:7121 on
device "LTO-1" (/dev/nst1). Write of 64512 bytes got -1.
26-Feb 11:13 sbgrid-sd: Re-read of last block succeeded.
On the other hand, I cannot 100% exclude the possibility that some
lower
level Bacula subroutine releases the device lock thus allowing some
race
condition with other threads (jobs). I'll take a look at the code
with that
in mind in the near future -- this week I'm tied up with family
visitors so
don't have much time.
No worries! Let me take this opportunity to properly thank you for
all the work you've done on this project. I'm planning on putting
together a writeup (once I get the backups working without a hitch)
to document the successful transition we made from a commercial
application, etc.
Unfortunately, testing such a problem is not easy as it takes a
long time to
write most tapes (especially LTOs).
Yep :) But I've got a few jobs coming this weekend that will go
through some volumes, if you'd like me to test anything out.
Cheers,
Ian
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