raidtest for zfs

Ivan Voras ivoras at
Sun Sep 23 14:35:50 PDT 2007

Pawel Jakub Dawidek wrote:

> ZFS ZVOL doesn't present raw blocks to use, like graid3/graid5, so it's
> quite possible that because of how the data was written and how ZFS
> prefetches the data it's faster than one disk.

So does ZVOL actually offer "cooked" data to its users (caching, lazy
allocation?), similar to what would happen if the entire ZVOL was one
big file in a "normal" ZFS file system?

Slightly off-topic: for most file systems, it used to be recommended
that "lots of smallish files" be distributed in lots of directories in a
radix-like fashion instead of keeping all files in one huge directory.
Do you know if ZFS does something to help this situation, or are the old
rules of thumb still applicable?

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