We have a Data Domain DD530 fibre connected to our Windows Networker
7.4.2 server. The issue with adv_file type on Data Domain is in fact
true, so we went with the VTL option. During setup, we had a licensing
issue where we purchased a 10GB VTL license, but Legato did not
recognize the device as a VTL. We had to manually edit a file in the
NSRDB directory on the Networker server, searching the files to find the
def file for the VTL, and manually edit the value for "Virtual Jukebox"
from no to yes.
On the Data Domain box, make sure to properly set "Marker Type":
filesys option set marker-type nw1
filesys disable
filesys enable
We had this set incorrectly, and saw our compression rates improve after
fixing this. Currently we are getting about 11x compression.
Performance is about the same as we saw with tape. Data Domain
compresses 'on the fly' so read and write operations tax the CPU
heavily. You might consider Exagrid, who say they have resolved the
Legato adv_file type performance issue, and avoid VTL altogether, and
are very aggressively targeting Data Domain clients with their
alternative product.
All in all the Data Domain is doing what we need, but I am disappointed
with restore times, and during 'filesys clean' operations, the box is
very slow to respond to web requests, ssh, etc.
Another Data Domain issue that has been reported to us: A replicated
Data Domain target can never be used by Legato running VTL to do a
restore. The reason we are told is that Legato will never recognize the
volume labels. A workaround might be to license both as VTL's, and do
clone jobs from primary to secondary.
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of John Ford
Sent: Thursday, September 18, 2008 9:03 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Issues with Backup to Disk
Currently I've been backing up to a CDL710(now I guess EDL) then cloning
to a ADIC Scaler 100 with LTO's. Things for the most part are ok, but
we are now strongly considering(I have the budget for it) backing up to
a Dedupe libary. I'm looking that the EMC DL3D 1500 or 3000, and the
Data Domain box(we are also going to replicate to DR). Anyway, I just
had a conference call and I'm hearing that some people have had issues
with Advanced File Type Device and performance(on windows). The number
being thrown around is 40MB/s(Big B). So are any of you all seeing this
problem?? I'm on 7.4.2 on windows 2003 32bit 4 x Dual Core AMD. There
recommendation is to migrate networker over to Unix, which I'm not
totally opposed to but I just got the dust settled on this box.
Also as a alternative are any of you using VTL emulation on these
box's??
If so I'd like to know your experience with them.
Thanks!
John
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