01-06-2009
How do I set the block size in ZFS?
I was able to create a zpool and then created a zfs filesystem (BTW, thanks to all those who helped me get by the hard drive formatting issues I had posted here earlier).
I read that ZFS does variable block size, that is, a user can specify a blocksize, and if a file is smaller than the user specified blocksize, the file would be the smallest power of two between 512 bytes and the user specified blocksize.
Just how would I specify the blocksize? Is that an option I have to use in the zpool create command?
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LEARN ABOUT CENTOS
filefrag
FILEFRAG(8) System Manager's Manual FILEFRAG(8)
NAME
filefrag - report on file fragmentation
SYNOPSIS
filefrag [ -bblocksize ] [ -BeksvxX ] [ files... ]
DESCRIPTION
filefrag reports on how badly fragmented a particular file might be. It makes allowances for indirect blocks for ext2 and ext3 filesys-
tems, but can be used on files for any filesystem.
The filefrag program initially attempts to get the extent information using FIEMAP ioctl which is more efficient and faster. If FIEMAP is
not supported then filefrag will fall back to using FIBMAP.
OPTIONS
-B Force the use of the older FIBMAP ioctl instead of the FIEMAP ioctl for testing purposes.
-bblocksize
Use blocksize in bytes for output instead of the filesystem blocksize. For compatibility with earlier versions of filefrag, if
blocksize is unspecified it defaults to 1024 bytes.
-e Print output in extent format, even for block-mapped files.
-k Use 1024-byte blocksize for output (identical to '-b 1024').
-s Sync the file before requesting the mapping.
-v Be verbose when checking for file fragmentation.
-x Display mapping of extended attributes.
-X Display extent block numbers in hexadecimal format.
AUTHOR
filefrag was written by Theodore Ts'o <tytso@mit.edu>.
E2fsprogs version 1.42.9 December 2013 FILEFRAG(8)