Re: RFC: High availability replication/raid-like filesystem

Hi,

stan@xxxxxxxxxxxxxxxxxx wrote:
:> > Both AFS and GFS look great, but require kernel modifications, so you
:> > can say goodbye to commercial support contracts from some vendors...
:> > which means the clients I have won't be interested in it.
:>
:> I've found this looking a bit different in the big banks world.
:> There, Microsoft would sign a platinum 7x24 contract to support
:> mainframes
:> running 20 years old MVS, if the customer asks for it.

: Not all clients have these amounts of money, some can only afford basic
: Linux maintenance contracts with vendors, cannot afford NAS devices and
: need a simple and reliable way to replicate filesystems between
: locations.

OK- I gotta comment.

You've got 200TB of email that needs to get stored and synched across
the Pacific in a finite amount of time- and you 'can only afford
basic services'??

I didn't say I had 200Tb of email, I said ... "Now ... if I can
replication about 200Tb of mail". Purely hypothetical. Forgive my
spelling mistake, should be "replicate" not "replication".

Nor is it necessarily across the pacific ... this was purely an
example. Read again "...between *say* California and Hong Kong and keep
them in sync..."

Didn't say *I* can only afford basic services, I said ... "Not all
clients have these amounts of money". I don't see where you got the
idea I was referring to myself.


Do you have any idea what it costs to store 200TB of data with
even minimal backups?

Do you have any idea what it would cost to lease enough trans-pacific
bandwidth to move 200TB of data, let alone keep it synced up?

This topic isn't about backups, storage costs or cost of trans-pacific
bandwidth, it is about a request for comment for replication and
RAID-like behaviour of a filesystem. I was using trans-pacific
replication as a purely hypothetical scenario. If it'll make you happy,
assume its on a Gbit LAN.


-Nigel

.

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