>>>>> "re" == Richard Elling <richard.ell...@gmail.com> writes:
re> # ptime zdb -S zwimming Simulated DDT histogram:
re> refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE
DSIZE
re> Total 2.63M 277G 218G 225G 3.22M 337G 263G
270G
re> in-core size = 2.63M * 250 = 657.5 MB
Thanks, that is really useful! It'll probably make the difference
between trying dedup and not, for me.
It is not working for me yet. It got to this point in prstat:
6754 root 2554M 1439M sleep 60 0 0:03:31 1.9% zdb/106
and then ran out of memory:
$ pfexec ptime zdb -S tub
out of memory -- generating core dump
I might add some swap I guess. I will have to try it on another
machine with more RAM and less pool, and see how the size of the zdb
image compares to the calculated size of DDT needed. So long as zdb
is the same or a little smaller than the DDT it predicts, the tool's
still useful, just sometimes it will report ``DDT too big but not sure
by how much'', by coredumping/thrashing instead of finishing.
pgprpk9HSdr61.pgp
Description: PGP signature
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
