Mailing List Archive: Linux Virtual Server: Users

[lvs-users] hi i need help in NFS share

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aliaj00 at gmail

Nov 14, 2007, 12:12 AM

Post #1 of 4 (510 views)
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[lvs-users] hi i need help in NFS share

hi i am new here and there is a question that i wanted to ask if it is
possible to. i have a scenario in witch it is required to have access to a
very large data 115GB that is read only but i want it to be accessed very
quick and i saw that lvs and ipvadm can make load balancing but i want to
use it iscsi if possible, do anybody know how to do it.

so my idea was that the client accessed the dip for iscsi service and the
dip forwarded it to the least busy server RIP for requests so that i can
have more bandwidth avaible for the same set of data as the data is read
only so i have the same data on all rip servers which are about 4 [fedora
core 4] the client actually is a windows 2003 server serving video so
this is it can anybody help??????

thanks to all of you
--
best regards

Shpetim Aliaj
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graeme at graemef

Nov 14, 2007, 1:43 AM

Post #2 of 4 (486 views)
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Re: [lvs-users] hi i need help in NFS share [In reply to]

Hi there

Firstly - do you mean NFS (as in your subject) or iSCSI (as in your
message body)?

NFS is all but impossible to load balance due to the ephemeral nature of
several parts of the protocol.

iSCSI, being based on TCP and using well-known and defined ports, should
be fairly easy - however I don't see any benefit at all in load
balancing several iSCSI targets (servers) back to one initiator
(client).

Because iSCSI is a connected protocol - ie. there are very long-lived
sessions at play - then you'd only ever see four sessions on your
director (when correctly configured, of course); this would correspond
to four mounted LUNs (devices) on your client.

At this point, how your application accesses the data on these LUNs
(which you say is identical...) is entirely up to you.

I can see that, for example, using a gigabit ethernet network you move
the bottleneck back to the disks on each server, so combining four would
allow you some benefit - however, do you know what your actual maximum
throughput of one target/initiator pairing is?

It's an interesting idea but I'm not sure that LVS is the way to do it.
If you really need the throughput, why not just mount the 4 LUNs without
any intervening hardware and see how it goes from there?

Graeme

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jmack at wm7d

Nov 14, 2007, 4:01 AM

Post #3 of 4 (482 views)
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Re: [lvs-users] hi i need help in NFS share [In reply to]

On Wed, 14 Nov 2007, timi koli wrote:

> hi i am new here and there is a question that i wanted to ask if it is
> possible to. i have a scenario in witch it is required to have access to a
> very large data 115GB that is read only but i want it to be accessed very
> quick and i saw that lvs and ipvadm can make load balancing but i want to
> use it iscsi if possible, do anybody know how to do it.

lvs can make a load balanced read-only file server. It's
mentioned in the HOWTO

> so my idea was that the client accessed the dip

VIP

> the client actually is a windows 2003 server serving video so
> this is it can anybody help??????

the client is a server? The client has to be a client

Joe

--
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!

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jmack at wm7d

Nov 14, 2007, 4:03 AM

Post #4 of 4 (485 views)
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Re: [lvs-users] hi i need help in NFS share [In reply to]

On Wed, 14 Nov 2007, Graeme Fowler wrote:

> Hi there
>
> Firstly - do you mean NFS (as in your subject) or iSCSI (as in your
> message body)?
>
> NFS is all but impossible to load balance due to the ephemeral nature of
> several parts of the protocol.

it's OK read-only if you make the disks physically
identical. Not a lot of people are doing it :-)

Joe

--
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!

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