On Aug 18, 2009, at 1:16 PM, Paul Kraus wrote:
Is the speed of a 'zfs send' dependant on file size / number of
files ?
Not directly. It is dependent on the amount of changes per unit time.
We have a system with some large datasets (3.3 TB and about 35
million files) and conventional backups take a long time (using
Netbackup 6.5 a FULL takes between two and three days, differential
incrementals, even with very few files changing, take between 15 and
20 hours). We already use snapshots for day to day restores, but we
need the 'real' backups for DR.
This is quite common.
I have been testing zfs send throughput and have not been
getting promising results. Note that this is NOT OpenSolaris, but
Solaris 10U6 (10/08) with the IDR for the snapshot interrupts resilver
bug.
You will need to do this in parallel.
We have had some discussions about a possible white paper on this
topic, but as yet there is no funding. So, it will remain in the
world of
professional services for the time being.
-- richard
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