[Beowulf] Re: RAID for home beowulf
jorg.sassmannshausen at strath.ac.uk
Sat Oct 3 15:18:43 EDT 2009
I agree with what Skylar wrote. However, ask yourself what are you going to do
with the cluster?
For example, I am doing quite a lot of molecular modelling, which requires
plenty of RAM and also scratch space.
So for the machines at the old University, I set up /boot and / as RAID1. Why?
Failover is the answere. In case one disc dies, I have degraded, but working
machine and the next possible time I can sort out the broken hdd. Actually, I
had to do that a few times as somehow the IDE hdd seem to be a bit dogdy and
broke quickly. Fortunately, within one day everything was back in working
order (I swapped both discs in that occassion, so I had to mirror twice).
There is a HowTo setup a failover boot as well.
( http://www200.pair.com/mecham/raid/raid1.html )
Also, if what you are doing needs plenty of scratch space, I would recommend a
RAID0 and xfs. Best to do that as a hardware raid as it is faster than a
I hope that helps a bit.
All the best
Am Samstag 03 Oktober 2009 schrieb beowulf-request at beowulf.org:
> Message: 2
> Date: Sat, 03 Oct 2009 19:41:28 +0200
> From: Tomislav Maric <tomislav.maric at gmx.com>
> Subject: [Beowulf] RAID for home beowulf
> To: beowulf at beowulf.org
> Message-ID: <4AC78CC8.5060500 at gmx.com>
> Content-Type: text/plain; charset=ISO-8859-1
> Hi everyone,
> I've finally gathered all the hardware I need for my home beowulf. I'm
> thinking of setting up RAID 5 for the /home partition (that's where my
> simulation data will be and RAID 1 for the system / partitions without
> the /boot.
> 1) Does this sound reasonable?
> 2) I want to put the /home at the beginning of the disks go get faster
> write/seek speeds, if the partitions are the same, software RAID doesn't
> care where they are?
> 3) I'll leave the /boot partition on one of the 3 disks and it will NOT
> be included in the RAID array, is this ok?
> 4) I've read about setting up parallel swaping via priority given to
> swap partitions in fstab, but also how it would be ok to create RAID 1
> array of swap partitions for the HA of the cluster. What should I choose?
> I've gone through all the software raid how-tos, FAQs and similar, but
> they are not quite new (date at least 3 years) and there's no reference
> to clusters. Any pointers regarding this?
> Thank you in advance,
> I'm starting with this:
> 3 x Asus P5Q-VM motherboards
> 2 x Intel Quad Core Q8200 2.33GHz (2 nodes with 4 cores)
> 1 x Intel Core 2 Duo E6300 2.6GHz (master node)
> 3 x Seagate Barracuda 320GB SATA 2 HDDs
> gigabyte Eth switch with 8 ports .... etc ...
> Best regards,
University of Strathclyde
Department of Pure and Applied Chemistry
295 Cathedral St.
email: jorg.sassmannshausen at strath.ac.uk
Please avoid sending me Word or PowerPoint attachments.
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