> But now I have another question. > How 8k blocks will impact on performance ?
When tuning recordsize for things like databases, we try to recommend that the customer's recordsize match the I/O size of the database record. I don't think that's the case in your situation. ZFS is clever enough that changes to recordsize only affect new blocks written to the filesystem. If you're seeing metaslab fragmentation problems now, changing your recordsize to 8k is likely to increase your performance. This is because you're out of 128k metaslabs, so using a smaller size lets you make better use of the remaining space. This also means you won't have to iterate through all of the used 128k metaslabs looking for a free one. If you're asking, "How does setting the recordsize to 8k affect performance when I'm not encountering fragmentation," I would guess that there would be some reduction. However, you can adjust the recordsize once you encounter this problem with the default size. -j _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
