> -----Original Message----- > From: neil.per...@sun.com [mailto:neil.per...@sun.com]
> I think you misunderstand the function of the ZIL. It's not a journal, > and doesn't get transferred to the pool as of a txg. It's only ever > written except > after a crash it's read to do replay. See: > > http://blogs.sun.com/perrin/entry/the_lumberjack I also read another blog[1]; the part of interest here is this: The zil behaves differently for different size of writes that happens. For small writes, the data is stored as a part of the log record. For writes greater than zfs_immediate_write_sz (64KB), the ZIL does not store a copy of the write, but rather syncs the write to disk and only a pointer to the sync-ed data is stored in the log record. If I understand this right, writes <64KB get stored on the SSD devices. [1] http://blogs.sun.com/realneel/entry/the_zfs_intent_log _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
