[OpenIndiana-discuss] Finding the "last" snapshot for a zfs volume

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Most of my systems I do "zfs list -t snapshot > file" then grep that file of each of the filesystems I am interested in.

John

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From: Discussion list for OpenIndiana [mailto:openindiana-discuss at openindiana.org] 
Sent: 12 May 2014 12:20
To: Discussion list for OpenIndiana
Subject: [OpenIndiana-discuss] Finding the "last" snapshot for a zfs volume

On our backup servers I have a "backup-check" script that checks to see what the last snapshot for a particular volume is (and compares it with the current date)

df -F zfs -h |grep $mypool | nawk '{system("zfs list -t snapshot -r "$1" \| tail -1")}' | egrep -v "$yesterday|no datasets"

okay, it's messy, but it should find the last snapshot for each zfs slice within a pool.

However with the number of pools on the server increasing, and the number of snapshots getting bigger every day, I was wondering if there is an easier way of getting the latest snapshot than "zfs list -t snapshot -r pool/snapshot | tail -1"

Any ideas would be helpful.

Jon
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