FreeBSD + ZFS on a production server?
wojtek at wojtek.tensor.gdynia.pl
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,
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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