[Linux-HA] New file server
kg at medical-insight.com
Thu Jun 3 00:05:38 MDT 2004
Greg Cerveny wrote:
> We've been looking at getting an external disk array to connect
> to a 'file server' machine.
Last year I installed a few external disk arrays ranging from 1 TB to
3.2 TB. The arrays were in cases connected to Linux boxes. Please be
aware of the fact that you might wish to have 64 bit PCI based SCSI
(Ultra 160+) controllers in order to get good performance. Moreover,
consider to have a lot of memory (1-2 GB).
The vendors were zero-d <http://www.zero-d.com> (the arrays), Adaptec
(the controllers) and Intel (motherboards and gigabit ethernet).
>After reading a few articles on linux-ha, I'm thinking perhaps
>we should just have two servers hooked up two the disk array and
>clustered as fail-over servers.
Most arrays can be dual attached i.e., you can hook up two servers. But
only one serrver can access the "partition" at a time. Heartbeat can
easily control this (through the Filesystem resource). I have recently
done a few experiments using an external Firewire disk. Firewire support
dual attached hosts and Linux has some support for it (developed by
Oracle - a small kernel patch can be downloaded from Oracle's website).
As far as my experiments showed Heartbeat did not have any troubles with
this hardware configuration.
Btw, one experiment was that I mounted one partition on one server and
another partition on the other server. I have running Heartbeat in an
active/active configuration (DB/2 on one server, Apache on the other).
I have never tried to run Samba as service but I have seen references to
HA NFS servers (even on this list).
To sum up: yes, it is possible to have one external disk array and two
Kenneth Geisshirt <kg at medical-insight.com> - Software Developer
Medical Insight A/S, Hovedgaden 451C, DK-2640 Hedehusene, Denmark
Phone: +45 5157 3096 - Fax: +45 4655 1166 - Web: www.medical-insight.com
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