Ok... here's the existing data: There are 3,236,316 files summing to 97,500,008,691 bytes. That puts the "average" file at 30,127 bytes. But for the full breakdown:
512 : 7758 1024 : 139046 2048 : 1468904 4096 : 325375 8192 : 492399 16384 : 324728 32768 : 263210 65536 : 102407 131072 : 43046 262144 : 22259 524288 : 17136 1048576 : 13788 2097152 : 8279 4194304 : 4501 8388608 : 2317 16777216 : 1045 33554432 : 119 67108864 : 2 I produced that list with the output of ls -R's byte counts, sorted and then processed with: (while read num; do count=$[count+1]; if [ $num -gt $size ]; then echo $size : $count;size=$[size*2]; count=0; fi; done) <imapfilesizelist ... now the new machine has two 2T disks in a ZFS mirror --- so I suppose it won't waste as much space as a RAID-Z ZFS --- in that files less than 512 bytes will take 512 bytes? By far the most common case is 2048 bytes ... so that would indicate that a RAID-Z larger than 5 disks would waste much space. Does that go to your recomendations on vdev size, then? To have an 8 or 9 disk vdev, you should be storing at smallest 4k files? _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
