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Re: [Linux-cluster] WebFarm using RedHat cluster suite ?



Marc Grimme wrote:
Hello,
I think the best way to tell what storage or infrastructure would be the best is to know more about your current setup and what issues with that you want to get ahead of. For example: if you really think about using iscsi, I don't think that SCSI or SATA drives make a big difference - depending on how many drives you use. But if all webservers currently have locally attached disk drives you want scale too linar with exchanging and IDE/parallel-SCSI Bus with an network topology using Ethernet. But my opinion is: if you have a lot of I/Os make yourself mostly independent from the latency of an ethernet and rethink about using Fibre-Channel with GFS.

Honestly, ethernet latencies (especially on gigabit ethernet) are lower than fiber channel latencies, so this statement doesn't really hold up. If you want very fast speeds, get an iSCSI array, populate it with 15k RPM scsi disks with big caches, max the cache out on the array, and set it up for a RAID0+1 (or RAID10 depending on the implementor). If you want fast speed, but not a big price, you can notch down to 10K scsi disks, or use 15k scsi disks and a raid 5, etc, and keep notching down until it fits your budget and needs.
I agree here though that we really need to know a few things:

- what kind of traffic is this?
- size of the files most commonly used
- total data size (how much space you need)
- budget
- demands (availability/performance/etc)

Eric





But the best advices could be made if you make your current setup and the things you want to achieve more clearly.

Regards Marc.

On Wednesday 18 January 2006 22:01, FM wrote:
Thanks for the reply,
I read about SATA storage but we sync from lan to dmz, so there is lots
of r/w.

Michael Will wrote:
I am surprised you use SCSI drives on the storage if
you are price sensitive, usually SATA is the better
bang for the buck unless you are doing databases with
lots of small read and writes.

Michael

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of FM
Sent: Wednesday, January 18, 2006 12:34 PM
To: Redhat Cluster
Subject: [Linux-cluster] WebFarm using RedHat cluster suite ?

Hello everybody,

Is redhat cluster suite (RHEL 4 ) a good candidate for a webfarm ?
My setup would be : several servers (1U AMd dual core) connected to
iscsi storage array.

Is Iscsi a good choice (SAN prices are too high for us) for hardware ?
Our network is GB.
We will have SCSI 10KRPM + read and write cache on the SCSI card + RAID5
thanks !










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--
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
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