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| SUN Solaris The Solaris Operating System, usually known simply as Solaris, is a free Unix-based operating system introduced by Sun Microsystems . |
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02-02-2009
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Why does the # of blocks change for a file on a ZFS filesystem?
I created a zpool and zfs filesystem in OpenSolaris. I made two NFS mount points:
> 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 2009-01-15.17:20:13 zfs create -o mountpoint=/vol02 -o sharenfs=on -o canmount=on -o compression=lzjb raidpool/vol02 I did not make the mountpoints (vol01 and vol02) into volumes. I know you can set default blocksizes when you create volumes but you cannot make them exportable NFS exports. I am assuming that vol01 and vol02 are 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. 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 (the one without the LZ compression) I do the following stat command: stat --printf "%n %b %B %s %o\n" * The %b is the number of blocks used. The number of blocks changes after a few minutes after the file is created: # stat --printf "%n %b %B %s %o\n" * file.0 3 512 3 4096 file.512 1 512 512 4096 # stat --printf "%n %b %B %s %o\n" * file.0 3 512 3 4096 file.512 1 512 512 4096 # stat --printf "%n %b %B %s %o\n" * file.0 3 512 3 4096 file.512 3 512 512 4096 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)??? |
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