Software RAID performance? RAID-Z or vinum and RAID5?
manlief01 at gmail.com
Mon Mar 16 15:52:21 PDT 2009
I'm looking into moving a workstation from Ubuntu 10 to FreeBSD 7.1
(both amd64) and I'm a bit worried about storage -- specifically
moving from mdadm, which performs very well for me.
Current in Linux I use an mdadm RAID5 of 5 disks. After investigating
FreeBSD storage options, RAID-Z sounds optimal. I'd like to avoid
levels 3 and 1 due to write bottlenecks, and level 0 for obvious
reasons. Migrating from the existing mdadm is not an issue. I also
do not plan to boot from the software array.
Various docs/postings seem to indicate that using ZFS/RAID-Z under
FreeBSD will destroy my computer, run over my cat, and bail out the
investment banking industry. Will it really perform that poorly on a
Phenom and 8GB RAM? Significantly more resources than mdadm in Linux?
How about compared to RAID 5 under vinum?
1: The ability to read the array with the Linux FUSE ZFS
implementation is very appealing; don't care about performance for
such inter-op scenarios. Copy-on-write sounds awesome too.
2: ...and even level 5, now that I've learned of RAID-Z.
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