Le 20/05/2013 13:46, Nick Holland a écrit :
On 05/20/13 00:52, Hugo Osvaldo Barrera wrote:
Hi,
I'm building myself an openbsd-based fileserver, which will initially
have three disks with softraid in RAID5 mode.
I've three questions regarding softraid:
1) I intend on using a single-core 1.8Ghz Atom processor I have lying
around. Would that limit my performance too much? I'll be using this
fileserver mostly for media (movies/series/music) and some ocassional
backups. Can anyone share what CPU they've used and their experience? (I'm
clarifying my intended usage for the fileserver since I think it's quite
relevant to say if the CPU is or isn't enough).
Wrong question, I think. More than processor is memory (caching) and
disk interface (ahci rocks), network interface, etc.
2) How do I add additional volumes to an already created softraid
volume? I intend on adding additional disks as necessary. Is it possible?
Not in the way you are likely thinking.
Besides, your Atom board probably has a rather finite amount of
expandability.
3) The man pages report RAID5 as experimental. I'm curious, why is
this so? Is it just not-very-thoroughly tested, or is there some
missing feature? I read on a 2010 presentation that rebuild was not
implemented yet, is this still so?
That's really a question you will need to find out though
experimentation before you implement (i.e., you MUST practice this
recovery stuff before going into production), but yes, RAID5 rebuild is
still not there, so I would NOT recommend going this route.
However, a nice little RAID1 system to start, hopefully leaving you two
SATA ports for the next generation/upgrade disks.
Nick.
"RAID5 rebuild is still not there" Can you please make it more clear what
actual state of soft raid can and what it cannot do under RAID 5 ... I'm not so sure to
get it, thank you.
J.-F.
