Can someone refresh my memory on the different ashift values (12, 13, n)… and how they affect the pool?
(jasonbelec) zpool create -f -O compression=lz4 -O casesensitivity=insensitive -O normalization=formD -O atime=off -o ashift=12 pool raidz disk1 disk2 disk3 (ylluminate) zpool create -f -o ashift=13 tank raidz /dev/disk1s2 /dev/disk2s2 /dev/disk3s2 /dev/disk4s2 zfs create -o atime=off -o utf8only=on -o casesensitivity=insensitive -o normalization=formD -o compression=lzjb -o mountpoint=/Users/username tank/username Specifically pools built with ashift=12 vs ashift=13. What is the default if none is specified? Also, is there a difference between normalization=formD at the pool vs directory level? Fred -- On Saturday, March 8, 2014 8:28:27 PM UTC-5, ylluminate wrote: > > Hi folks, thought it was time to try maczfs again. I am shifting over > from ZEVO due to GreenByte's fubar of the project. Seems like the shift > over to OpenZFS is worthwhile and I'm satisfied to see some positive > results. > > One thing that has bothered me so far is the marked differential in speed. > Running AJA System Test I am seeing on ZEVO with lzjb compression rates > such as the following: > File Size Sweep > MB MB/sec > Read Write > 128.0 1828.7 917.7 > 256.0 2291.3 545.3 > 512.0 1902.6 272.7 > 1024.0 1965.6 350.4 > 2048.0 1877.9 305.7 > 4096.0 1898.1 323.9 > 8192.0 1864.9 355.6 > 16384.0 1749.5 312.8 > > Whereas with maczfs as installed via: > http://zerobsd.tumblr.com/post/62586498252/os-x-with-zfs > > I am seeing: > File Size Sweep > MB MB/sec > Read Write > 128.0 390.7 82.3 > 256.0 285.5 93.9 > 512.0 290.2 84.1 > 1024.0 275.5 88.2 > 2048.0 272.7 87.5 > 4096.0 268.7 88.6 > 8192.0 281.3 88.3 > 16384.0 273.2 85.2 > > With LZJB on maczfs I am seeing about 10-30% slower rates. > > Any thoughts on why we would be seeing such a remarkable difference at > this point? > > > -ylluminate > -- --- You received this message because you are subscribed to the Google Groups "zfs-macos" group. To unsubscribe from this group and stop receiving emails from it, send an email to zfs-macos+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.