[Pvfs2-users] linux vserver and PVFS2

[Phil Carns]

Hi,

Here is some more information about the high availability options for PVFS:

http://www.pvfs.org/cvs/pvfs-2-7-branch-docs/doc//pvfs2-ha-heartbeat-v2/pvfs2-ha-heartbeat-v2.php#SECTION00031000000000000000

There will be an improved (and simplified) version of this document 
going out with our next release, but the basics of it are the same.

There are two additional hardware requirements for HA beyond the normal 
PVFS requirements: shared storage (DRDB or SAN, for example) and remote 
power control (IPMI or networked power strip, for example).  As far as 
shared storage goes, I don't have any experience with DRDB to be able to 
speak for it in this scenario, but fibre channel, iSCSI, and SRP seem to 
work fine.

-Phil

> 
> Typical failover/HA systems for PVFS2 are handled by a daemon called
> Heartbeat and in order for it to work you basically need to have
> multiple physical nodes with access to the same LUN's(disks).  I dont
> know if this is very simple to implement without SRP/iSCSI/etc.
> 
> There is no mirroring done inside pvfs2, I've looked into it, and
> several others have looked into it and provided proof of concepts, but
> none of said work has seen the light of day.
> 

< cut >

>>>> Is there a way to set up PVFS2 to tolerate 1-2 node losses on
>>>> above 20-node assembly, and how much of the raw storage would I lose
>>>> that way?
>>>>
>>>> Thanks,
>> --
>> Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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