I set up a ZFS system on a Linux x86 box. [b]> zpool history
History for 'raidpool': 2009-01-15.17:12:48 zpool create -f raidpool raidz1 c4t1d0 c4t2d0 c4t3d0 c4t4d0 c4t5d0 2009-01-15.17:15:54 zfs create -o mountpoint=/vol01 -o sharenfs=on -o canmount=on raidpool/vol01[/b] I did not make the export (vol01) into a volume. I know you can set default blocksizes when you create volumes but you cannot make them exportable NFS exports. Thus, I did not make the NFS exports into volumes and I did not specify a blocksize on the NFS exports. I am assuming that vol01 is using variable blocksizes because I did not explicitly specify a blocksize. Thus, my assumption is that ZFS would use a blocksize that is the the smallest power of 2 and the smallest blocksize is 512 bytes while the biggest would be 128k I use the stat command to check the filesize, the blocksize, and the # of blocks. I created a file that is exactly 512 bytes in size on /vol01 I do the following stat command: [b]stat --printf "%n %b %B %s %o\n" * [/b] The %b is the number of blocks used, %B is the blocksize. The number of blocks changes after a few minutes after the file is created: # stat --printf "%n %b %B %s %o\n" * file.512 [b]1[/b] 512 512 4096 # stat --printf "%n %b %B %s %o\n" * file.512 [b]1[/b] 512 512 4096 # stat --printf "%n %b %B %s %o\n" * file.512 [b]1[/b] 512 512 4096 Q1) Why does the # of blocks change after a few minutes? And why are we using 3 blocks when the file is only 512 bytes in size (in other words, only 1 block is needed)??? This makes it seem that the minimum blocksize isn't 512 bytes but 1536 bytes. Q2) Is there a way to force ZFS to use 512 blocksizes? That means that if a file is 512 bytes in size or smaller, it should only use 512 bytes -- the number of blocks it uses should be 1. I don't know how to do that using the zpool or zfs options. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
