What about the clients that have their data on the Centera, is there any
possibility there?
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 09:33
>To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
>Subject: Re: [Networker] Centera Backup & Recovery Module Performance
>
>Here is a better diagram on how it works.
>
>
>+-------------+
>+ Legato + ====>+
>+ Networker + |
>+ Server + | NDMP Protocol
>+ + |
>+ CBRM + <====+
>+ Software + +----------+
>+ + + +
>+ + Centera API + Centera +
>+ + ====================> + +
>+-------------+ Over TCP/IP +----------+
>
>The problem is the Centera API is a single savestream so there
>isn't anything you can do to improve performance. You can't
>attach tape drives to the Centera for normal NDMP or even use
>DSA since the Centera doesn't support NDMP itself, only
>through the CBRM software.
>
>
>----
>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 Matthew Huff
>Sent: Monday, June 11, 2007 12:11 PM
>To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
>Subject: Re: [Networker] Centera Backup & Recovery Module Performance
>
>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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