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List:       veritas-vx
Subject:    RE: [Veritas-vx] Veritas Volume Replicator Slow
From:       "Mark Schipper" <mschipper () lightsurf ! com>
Date:       2004-02-18 18:08:58
Message-ID: FOEPJPHLCAEGFLNAALGFKEKMCKAA.mschipper () lightsurf ! com
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Hmmm...

Not too familiar with USB disks or JBOD on NT (lucky me)...but I'm going to
guess that your bottleneck is either the disk config or more likely your
hub. You really need 100Mbit full duplex to get the most out of your NIC's.
I would start by replacing your hub with a 100 Mbit switch, or a crossover
cable (they're pretty damn fast). Check both NIC's afterwards to verify
100Mbit/full. At that point you might expect to see up to 10MB/sec xfer...if
your storage can keep up.

If your hub is a 10Mbit hub, you are getting the performance you should be
(1MB/sec).

-----Original Message-----
From: veritas-vx-admin@mailman.eng.auburn.edu
[mailto:veritas-vx-admin@mailman.eng.auburn.edu]On Behalf Of
Unit_Nt_Consultant (E-mail)
Sent: Tuesday, February 17, 2004 8:48 PM
To: mschipper@lightsurf.com; veritas-vx@mailman.eng.auburn.edu
Subject: RE: [Veritas-vx] Veritas Volume Replicator Slow


Sure,

I am using JBOD's on primary and secondary -- This is in my LAB environment
.. not production yet **
the volumes have approx 30 MB of data , size of the voulme is 22GB
using USB 2.0 disks
running Async
just plugged into a hub

It seems that VVR replicates block by block even if there is no data on it.

My problem is not getting my LAB working fine.. just want to see what the
bottleneck is so that in PROD I don't duplicate it.

Prod is going to be on Clariion CSX.. via Emulex HBA's

thank you.

UNC

-----Original Message-----
From: veritas-vx-admin@mailman.eng.auburn.edu
[mailto:veritas-vx-admin@mailman.eng.auburn.edu]On Behalf Of Mark
Schipper
Sent: Wednesday, February 18, 2004
To: veritas-vx@mailman.eng.auburn.edu
Subject: RE: [Veritas-vx] Veritas Volume Replicator Slow



A few questions first...

What sort of storage on either end of things? JBOD's or hardware RAID?
What is the average file size in that 22GB volume? (lots of small files can
be rough)
What HBA's (SCSI/FC PCI adapters)
Sync or async?
Is the 22GB source being used? Heavily? (aside from VVR)
What sort of network connection on each host?
Switched or hub?

If I did the math right you're getting about 1MB/sec...which is pretty
painful...but need lots more info start guessing at the cause.


-----Original Message-----
From: veritas-vx-admin@mailman.eng.auburn.edu
[mailto:veritas-vx-admin@mailman.eng.auburn.edu]On Behalf Of
Unit_Nt_Consultant (E-mail)
Sent: Tuesday, February 17, 2004 6:01 PM
To: veritas-vx@mailman.eng.auburn.edu
Subject: [Veritas-vx] Veritas Volume Replicator Slow


Any recommendations how to speed up VVR
I have 22 gb it's taking for a complete sync over 6 hours.

there is very little network traffic.


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