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owtch
2007 May 03
5
ZFS vs UFS2 overhead and may be a bug?
[originally reported for ZFS on FreeBSD but Pawel Jakub Dawid
says this problem also exists on Solaris hence this email.]
Summary: on ZFS, overhead for reading a hole seems far worse
than actual reading from a disk. Small buffers are used to
make this overhead more visible.
I ran the following script on both ZFS and UF2 filesystems.
[Note that on FreeBSD cat uses a 4k buffer and md5 uses a 1k