[Novalug] GFS?

Smith, Michael J. Michael.J.Smith@unisys.com
Wed May 2 17:46:20 EDT 2007


I own a couple of large-ish SANs.  There isn't a good way at the block
level do this cheaply (both in the money sense and in the computer
science sense) but there are a couple of vendors who will want to sell
you something that does it--Symantec, EMC, FalconStor, and we have an
in-house solution.  They all cost more than your pieces of disk do, so
they're probably not cost-effective.





Michael J Smith, CISSP-ISSEP michael.j.smith@unisys.com
CISO, Unisys Federal Service Delivery Center
703.579.2271 O
703.855.0890 C
"Those who do not understand Unix are condemned to reinvent it, poorly."
--Henry Spencer 

 

> -----Original Message-----
> From: novalug-bounces@calypso.tux.org 
> [mailto:novalug-bounces@calypso.tux.org] On Behalf Of Brian 
> Steisslinger
> Sent: Wednesday, May 02, 2007 5:36 PM
> To: John Franklin
> Cc: NOVALUG
> Subject: Re: [Novalug] GFS?
> 
> mirroring across the wan is bad!
> 
> You need a file level replication solutin.
> What is yous link speed and latency? Do you synchrnous or 
> asynchronous replication. Rsync may work, do both sides need 
> to process data simultaneously or are you doing this DR/Coop?
> 
> On 5/2/07, John Franklin <franklin@elfie.org> wrote:
> > On Wed, 2007-05-02 at 16:13 -0400, Nick Danger wrote:
> >
> > > I think I misunderstood the purpose of GFS :-) What Im 
> looking for 
> > > is to have two geographically separated NAS units. NAS units are 
> > > cheap in single form, 3 terrabytes for less then 10grand.  The 
> > > question is, how can I mirror the two file systems for 
> failover? I 
> > > know how to do it at the application/network level, just 
> not at the 
> > > data/FS level.  I kept thinking GFS but that seems more 
> like making 
> > > lots of disks appear as one, not for mirroring. Unless Im 
> reading it wrong.
> > >
> > > So, pointers? Links? Case studies? I'll summarize what I find and 
> > > send it back out to the list.
> > >
> >
> >
> > If the NAS boxes support iSCSI, you can set up a software 
> RAID1 with 
> > them.  Make NAS1 and NAS2 two iSCSI targets that map to 
> /dev/sda and 
> > /dev/sdb, then use md.conf to connect them. That said, I 
> have no idea 
> > how fault-tolerant software RAID is, nor how much the lag 
> between the 
> > two would affect performance on a day-to-day basis.
> >
> > jf
> > --
> > John Franklin <franklin@elfie.org>
> >
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