Hi, How are the statistics in 'zpool iostat -v' computed? Is this an x-minute-average? I noticed that if there's no I/O for a while, the numbers keep decreasing and the zpool manpage doesn't say anything about this.
By the way, the manpage links in http://www.opensolaris.org/os/community/zfs/docs/ are not correct, they are linked to wrong documents. Anyway, I noticed that the 'zpool scrub' command always keeps increasing the used disk space (specifically, the deferred free blocks) and it doesn't seem to be getting freed. Here's how I tested: # dd if=/dev/zero of=/tmp/test1 bs=1M count=100 # dd if=/dev/zero of=/tmp/test2 bs=1M count=100 # dd if=/dev/zero of=/tmp/test3 bs=1M count=100 # zpool create test raidz /tmp/test1 /tmp/test2 /tmp/test3 # zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT test 286M 89K 286M 0% ONLINE - # zpool scrub test # zpool scrub test # zpool scrub test # zpool scrub test # zpool scrub test # zpool scrub test . . . # zpool scrub test # zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT test 286M 6.45M 280M 2% ONLINE - Notice the used disk space... it gets even bigger if I continue doing zpool scrub. # zdb -bb test Traversing all blocks to verify nothing leaked ... No leaks (block sum matches space maps exactly) bp count: 530 bp logical: 4005376 avg: 7557 bp physical: 2105344 avg: 3972 compression: 1.90 bp allocated: 6764544 avg: 12763 compression: 0.59 SPA allocated: 6764544 used: 2.26% Blocks LSIZE PSIZE ASIZE avg comp %Total Type 498 3.57M 1.92M 6.16M 12.7K 1.86 95.47 deferred free 1 512 512 2K 2K 1.00 0.03 object directory 1 512 512 2K 2K 1.00 0.03 object array 1 16K 1.50K 6.00K 6.00K 10.67 0.09 packed nvlist - - - - - - - packed nvlist size 5 80.0K 65.0K 198K 39.6K 1.23 3.00 bplist - - - - - - - bplist header - - - - - - - SPA space map header 6 24.0K 5.00K 20.0K 3.33K 4.80 0.30 SPA space map - - - - - - - ZIL intent log 8 128K 9.00K 49.0K 6.12K 14.22 0.74 DMU dnode 2 2K 1K 6.00K 3.00K 2.00 0.09 DMU objset - - - - - - - DSL directory 2 1K 1K 4K 2K 1.00 0.06 DSL directory child map 1 512 512 2K 2K 1.00 0.03 DSL dataset snap map 2 1K 1K 4K 2K 1.00 0.06 DSL props - - - - - - - DSL dataset - - - - - - - ZFS znode - - - - - - - ZFS ACL - - - - - - - ZFS plain file 1 512 512 2K 2K 1.00 0.03 ZFS directory 1 512 512 2K 2K 1.00 0.03 ZFS master node 1 512 512 2K 2K 1.00 0.03 ZFS delete queue - - - - - - - zvol object - - - - - - - zvol prop - - - - - - - other uint8[] - - - - - - - other uint64[] - - - - - - - other ZAP - - - - - - - persistent error log 530 3.82M 2.01M 6.45M 12.5K 1.90 100.00 Total I have tested this with NexentaOS (build 40) and with zfs-fuse (build 45). Thanks. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
