Re: Software Raid 5

OpenSSI CFS is similar to
http://h30097.www3.hp.com/cluster/cfs_wp_1002.pdf if this helps you
understand what goes on.

Roger


On 6/22/06, Brown, Larry <[email protected]> wrote:
> How does OpenSSI handle the fail over on shared hardware?  Is the
> redundant master mounting read only until the current master fails and
> then re-mounts?  Does each mount rw and OpenSSI prevents the fail over
> machine from writing until the failure of the current master?
>
>
> Larry Brown
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> Alexander (Sasha) Wait
> Sent: Monday, June 19, 2006 4:25 PM
> To: [email protected]
> Subject: Re: [SSI-users] Software Raid 5
>
> On 6/19/06, Brown, Larry <[email protected]> wrote:
> > AOE stands for ATA over Ethernet.  There is a kernel driver that sets
> > up a drive as /dev/etherd/eX.Y where X is a shelf the actual drive is
> > designated to be on and Y is the drive within that shelf you are
> > addressing.  The communication for reads/writes is done over Ethernet
> > and so you can have raid over the network where two drives are on
> > different racks / power supplies etc.
> >
> RAID5 is pretty slow--even with hardware assist--I can't imagine it
> would be any fun over ethernet.  But what about software mirroring over
> ethernet?  iSCSI is a pretty standard way to get Xen clusters booted
> diskless.  And I suppose you could probably do software mirroring  this
> way.
>
> People on the list have probably done it (with or without OpenSSI.)
>
> Anyone?
>
> Sasha
>
>
>
> --
> http://freelogy.org/wiki/User:AlexanderWait  (GnuPG ID 4153C516)
>
>
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