On 04/10/10 14:55, Daniel Carosone wrote:
On Sat, Apr 10, 2010 at 11:50:05AM -0500, Bob Friesenhahn wrote:
Huge synchronous bulk writes are pretty rare since usually the
bottleneck is elsewhere, such as the ethernet.
Also, large writes can go straight to the pool, and the zil only logs
the intent to commit those blocks (ie, link them into the zfs data
structure). I don't recall what the threshold for this is, but I
think it's one of those Evil Tunables.
This is zfs_immediate_write_sz which is 32K. However this only happens
currently if you don't have any slogs. If logbias is set to throughput then
all writes go straight to the pool regardless of zfs_immediate_write_sz.
Neil.
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