FreeBSD + ZFS on a production server?

Wojciech Puchar wojtek at
Mon Jun 9 07:45:47 UTC 2008

>>> random write speeds (but still at least half of single drive). but
>>> this is advertised as a feature
>> Is this because of checksum verification (the need to read all
>> components) or something else? Any documentation/references?
> RAID-Z stores a single checksum over the whole stripe, instead of
> checksumming each disks's section separately, so it has to read from
> all disks to validate the stripe.  Only random reads are penalized,
> though.

random reads are most common read on unix, unless you process linearly 
huge files, but that's fast on UFS too.

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