On 02/19/11 01:00 PM, Rahul Deb wrote:
Hi All,
I have two text files:
1. *snap_prev.txt:* This one lists the name of the immediate previous
snapshots of the 100 zfs file systems. One per line.
2. *snap_latest.txt:* This one contains the name of the corresponding
latest snapshots of those 100 zfs file systems. One per line.
Is it posible to send/recv these 100 snapshots to a second systems
concurrently? Can someone point me to some sample bash script or to
some URL?
You could, but when I investigated this a couple of years ago it didn't
gain much in the way of performance (I though I could make better use of
network bandwidth, but discovered the receive end was IOP rather than
throughput limited) and was a great way to lock up the receiving
system. The lockups are thankfully an thing of the past, but I still
stagger sends to our backup server form other hosts.
If I send them one after another, it takes more time based on the size
of the filesystems. My idea is to send them concurrently so that it
takes much more less time for send/recv operation to the second system.
I'd run some tests with typical filesystems. Incremental sends with
lots of small updates are a lot slower than ones with fewer, bigger changes.
--
Ian.
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