Matthew Ahrens wrote:
Torrey McMahon wrote:
Howdy folks.
I've a customer looking to use ZFS in a DR situation. They have a
large data store where they will be taking snapshots every N minutes
or so, sending the difference of the snapshot and previous snapshot
with zfs send -i to a remote host, and in case of DR firing up the
secondary.
Cool!
I sure hope so. ;-)
However, I've seen a few references to the speed of zfs send being,
well, a bit slow. Anyone want to comment on the current speed of "zfs
send"? Any recent changes or issues found in this area?
What bits are you running? I made some recent improvements (6490104,
fixed in build 53, targeted for s10u4). There are still a few issues,
but by and large, performance should be very good.
Can you describe what problem you're experiencing? How much data, how
many files, how big of a stream, what transport, how long it takes,
are you seeing lots of CPU or disk activity on the sending or
receiving side when it's slow?
I'm only doing an initial investigation now so I have no test data at
this point. The reason I asked, and I should have tacked this on at the
end of the last email, was a blog entry that stated zfs send was slow
http://www.lethargy.org/~jesus/archives/80-ZFS-sendHHHH-trickle..html
Looking back through the discuss archives I didn't see anything else
mentioned but some others mentioned it to me off line as well. It could
be we all read the same blog entry so I figured I'd ask if anyone had
seen such behavior recently. Hopefully, I can get a test bed setup
fairly quickly and see how it works myself.
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