> I'd like to ask about whether there is a method to enforce a > certain txg > commit frequency on ZFS. Well, there is a timer frequency based on TXG age (i.e 5 sec by default now), in /etc/system like this: set zfs:zfs_txg_synctime = 5
Also there is a buffer-size limit, like this (384Mb): set zfs:zfs_write_limit_override = 0x18000000 or on command-line like this: # echo zfs_write_limit_override/W0t402653184 | mdb -kw We had similar spikes with big writes to a Thumper with SXCE in the pre-90's builds, when the system would stall for seconds while flushing a 30-second TXG full of data. Adding a reasonable megabyte limit solved the unresponsiveness problem for us, by making these flush-writes rather small and quick. See also: http://opensolaris.org/jive/thread.jspa?threadID=106453&start=15&tstart=0 http://opensolaris.org/jive/thread.jspa?messageID=347212
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