[zfs-discuss] Improving snapshot write performance

Richard Elling
2012-04-11T16:17:27Z

On Apr 11, 2012, at 1:34 AM, Ian Collins wrote:

> I use an application with a fairly large receive data buffer (256MB) to
replicate data between sites.
>
> I have noticed the buffer becoming completely full when receiving snapshots
for some filesystems, even over a slow (~2MB/sec) WAN connection.  I assume this
is due to the changes being widely scattered.

Widely scattered on the sending side, receiving side should be mostly
contiguous...
unless you are mostly full or there is some other cause of slow writes. The
usual disk-oriented
performance analysis will show if this is the case. Most likely, something else
is going on here.

> Is there any way to improve this situation?

Surely there must be...
 -- richard

--
ZFS Performance and Training
Richard.Elling at RichardElling.com
+1-760-896-4422







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