[Linux-HA] New file server
mschilli at vss.fsi.com
Thu Jun 3 08:04:59 MDT 2004
On Thu, 2004-06-03 at 01:05, Kenneth Geisshirt wrote:
> 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).
> No problems!
> I have never tried to run Samba as service but I have seen references to
> HA NFS servers (even on this list).
Samba can failover, but there WILL be a brief (a few seconds) where any
existing file operations will fail during the failover. Fortunately,
Windows does not really 'MOVE' data, but copy, then remove the original
once it verifies that the copy is completed. If your system can handle
that type of disruption, then Samba can be HA with a shared disk.
I've used Ataboy2 (by NexSAN for HA NFS/Samba, but honestly, i don't
like them. Also, you can get better performing SATA RAIDS cheaper from
Adjile (adjile.com), or Wenzel Data (an Adaptec reseller).
mschilli at vss.fsi.com
> To sum up: yes, it is possible to have one external disk array and two
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