> From: Neil Perrin [mailto:neil.per...@oracle.com] > > In general - yes, but it really depends. Multiple synchronous writes of any > size > across multiple file systems will fan out across the log devices. That is > because there is a separate independent log chain for each file system. > > Also large synchronous writes (eg 1MB) within a specific file system will be > spread out. > The ZIL code will try to allocate a block to hold all the records it needs to > commit up to the largest block size - which currently for you should be 128KB. > Anything larger will allocate a new block - on a different device if there are > multiple devices. > > However, lots of small synchronous writes to the same file system might not > use more than one 128K block and benefit from multiple slog devices.
That is an awesome explanation. Thank you. _______________________________________________ zfs-discuss mailing list email@example.com http://mail.opensolaris.org/mailman/listinfo/zfs-discuss