On 7/21/2010 7:47 AM, Eugen Leitl wrote:
How badly would a dual-core 1.6 GHz Atom with 4 GBytes RAM
be underpowered for serving 4-6 SATA drives? What kind of
transfer speed (GBit Ethernet, Intel NICs) can I expect with
raidz2 or raidz3?
Thanks.
For light usage (I'm assuming you want to use this kind of thing for at
home), it should be fine. You should have no problems serving via CIFS
or NFS or even iSCSI. RAM is a bit light, but if you are not doing
anything else which requires much RAM, you should be OK.
Without Dedup or Compression turned on, ZFS isn't that much of a CPU
pig. Particularly for serving small numbers of disks. RaidZ[123] will
consume slightly more CPU load that mirroring, but not so much as I'd
notice in a config such as yours.
Remember with RaidZ[123], you only get the IOPS equivalent of a single
drive (about 100/s for typical Sata drives), and random I/O performance
(throughput) of about the same (i.e. as one disk). However, you should
get streaming read/write speeds close to that of the number of data
disks (i.e. N-1 for RaidZ1, N-2 for RaidZ2, etc.). So, for things like
being a home media server, you'll easily keep up with a Gbit Ethernet.
For doing things like compiling over NFS/CIFS, the disks are going to be
your bottleneck.
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
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