zfs iostat fstat oh my

There’s a great blog post on Ben Rockwood’s site about zfs transactions. He talks about using iostat and fsstat (new command for me) and also includes a dtrace script that improved on from Roch’s blog at Sun. Good read and I have already used the dtrace script. I did have to include a \ in the following line though for the newline:

 printf("t: %d MB; %d ms of spa_sync; avg sz : %d KB; throughput %d MB/s\n",
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