Hi, guys,
I've been looking an issue where sometimes, after non-zero data blocks are
overwritten with zero blocks with compression on, the corresponding incremental
send stream does not include the FREE record for those blocks. The zdb -ddddddd
output seems to indicate that the blocks in question have never been written
(the offsets for them are not listed in the output).
This looks like the issue addressed by
commit a4069eef2e403a3b2a307b23b7500e2adc6ecae5
Author: Prakash Surya <prakash.su...@delphix.com>
Date: Fri Mar 27 13:03:22 2015 +1100
Illumos 5695 - dmu_sync'ed holes do not retain birth time
but I certainly do have that commit. I have experimented with overwriting
blocks at different offsets, ranges of blocks spanning L1 and L2 block
pointers, but I cannot reproduce the issue.
Any suggestions for directions to look ? Perhaps for a way to shape the block
tree such that this problem could arise ?
Best regards,
Boris.
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