Date: Mon, 16 Mar 2009 18:28:36 -0400 From: Mike Manlief <manlief01@gmail.com> To: freebsd-questions@freebsd.org Subject: Software RAID performance? RAID-Z or vinum and RAID5? Message-ID: <8958e9ea0903161528j492bb14ak36c6c3b22ed66a5c@mail.gmail.com>
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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[1]. I'd like to avoid levels 3 and 1 due to write bottlenecks[2], 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? Thanks, ~Mike Manlief 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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