Unfortunetly, it's kinda a hack. The Centera doesn't support NDMP at
all. What they developed is a NDMP tape server that runs on the same box
as the legato server (it could be on another box, but doesn't help). The
software pulls data from the Centera using their API and then sends it
to the NDMP software. Their backup software doesn't support volumes or
splitting in any fashion. It just starts a serial stream from the
beginning and sends a single saveset until it finishes.
I've opened cases repeatedly with EMC about this, and used our sales
team to escalate it to the CBRM project manager. EMC position is that
the CBRM was an afterthought, their main way of doing backups was
through replication to a 2nd Centera. The Centera was originally
targeted only for large enterprises that had offsites, etc and large IT
budges. We bought it when they were targeted mid-market companies. They
haven't updated the CBRM software in almost 2 years now and they don't
seem to understand why it's an issue with us. They think we should just
buy another Centera and replicate to it, or do full backups yearly. They
really appear clueless why that isn't acceptable to us.
----
Matthew Huff | One Manhattanville Rd
Dir of Operations | Purchase, NY 10577
OTA LLC | Phone: 914-460-4039
www.otaotr.com | Fax: 914-460-4139
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Wood, R A (Bob)
Sent: Monday, June 11, 2007 11:39 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Centera Backup & Recovery Module Performance
Sems like a pretty limited set of options given by EMC, that surprises
me a bit since there must be some other options.
Now, I don't know about CBRM module (I suspect it is a bit like NDMP is
to Networker?). Options you may have are
Split up the task in some way - can it be divided into volumes?
Once you have discovered the method to split it up you can start to
think about different options
For instance, is it possible to have more than one CBRM session running
at one time? (I understand that a single CBRM session can only supply
one savestream - in that respect it is similar to NDMP - but you can
have multiple NDMP sessions running in parallel)
Or, maybe, run a full on one volume one week and another the following
week with incremental/differential in between.
There may be several ways to achieve your desired backup rate. Maybe
backing up over the network may be an option? (once again, doesn't have
to be all of it in one go)
Without knowing much about the way you are using your equipment I can
only offer vague pointers, but, hopefully, they give you some hope that
there may be another way...
Regards
Bob
Bob Wood
Senior Technical Analyst
ITC - EMEAE London eHub
Chevron Limited
1 Westferry Circus, Canary Wharf
London, E14 4HA
Tel +44(0)20 7719 3885
Fax +44(0)20 7719 5101
woodr AT chevron DOT com
Chevron Limited. Registered in England and Wales (145197). Registered
office 1 Westferry Circus, Canary Wharf, London, England, E14 4HA
>-----Original Message-----
>From: EMC NetWorker discussion
>[mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On Behalf Of Matthew Huff
>Sent: 11 June 2007 08:09
>To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
>Subject: [Networker] Centera Backup & Recovery Module Performance
>
>As our EMC Centera increases in usage, our backups have been
>taking longer and longer. We do a full backup on Friday nights
>and differentials during the week. The full backup is now
>taking over 20 hours during the weekend. Since the CBRM module
>only creates one saveset stream the options are limited for
>tuning on the Legato side. The stream is unable to keep a
>single LTO-2 drive busy, so upgrading to LT0-4/VTL or
>save_to_disk doesn't appear to be a viable option.
>
>EMC's has suggested to either: 1) Only do full backups yearly
>2) Buy a second Centera, create an offsite and do replication
>to it. Since we find both suggestions laughable, and EMC has
>no 3rd option, does anyone using CBRM have any suggestions?
>
>
>
>----
>Matthew Huff | One Manhattanville Rd
>Dir of Operations | Purchase, NY 10577
>OTA LLC | Phone: 914-460-4039
>www.otaotr.com | Fax: 914-460-4139
>
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