Backup Central

We're looking at buying some Centera frames from EMC. Our volume needs
make replication cost prohibitive, (both in hardware and offsite hosting
space) so we're looking at an offsite library that could do (almost
constant) NDMP backups of the data we'll be loading into the Centera.
The sales guy we're working is pushing replication (hmmm....) and
doesn't think that an NDMP client can push enough data for us (we'd need
to sustain about 40MB/s to keep up with our forecast needs). =20

=20

Does anyone have experience with how much data an NDMP client can push??
And has anyone done so with a Centera?

=20

Thx

--=20

Rob



Confidentiality Notice: The information contained in this e-mail from =
Rob Haig and any attachments is legally privileged or otherwise =
confidential. If you are not an intended recipient, you are hereby =
notified that any dissemination, distribution or copying of this e-mail =
is strictly prohibited. If you have received this e-mail in error, =
please notify the sender and permanently delete the e-mail and any =
attachments immediately. Thank you in advance for your cooperation. =
3/7/2005 10:18 AM

Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu
=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D*=3D

On Mon, 7 Mar 2005, Rob Haig wrote:

We're looking at buying some Centera frames from EMC. Our volume needs
make replication cost prohibitive, (both in hardware and offsite hosting
space) so we're looking at an offsite library that could do (almost
constant) NDMP backups of the data we'll be loading into the Centera.
The sales guy we're working is pushing replication (hmmm....) and
doesn't think that an NDMP client can push enough data for us (we'd need
to sustain about 40MB/s to keep up with our forecast needs).

The best I have seen with our Mirapoint message stores backing up to a
Sony PetaSite Sony S-AIT drives is 11MB/s on a system that had no other
activity on it at the time with NetWorker 7.1.x connected via a fibre
bridge to a Sunfire v480 with plenty of RAM and CPU Power to spare. We
tried various things and no matter what we do, such as switching the
Mirapoint box from a 100MB line to a GB line, the throughput is a steady
11MB/s. Our backup hardware can sustain much faster speeds, no problem, as
can our network.

Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu

I have seen speeds of 30 MB/s with NDMP where the NAS is a Net Apps R200
NearStore and the drive is LTO-2. A lot depends on the type of data
being written and whether or not you can keep the drive streaming. An
LTO-2 drive is capable of supporting 40 MB/s write speeds if you can
sustain the data stream to it.

Regards,

Paul Esson
Senior Consultant
Redstor Limited

Direct: +44 (0) 1224 595381
Mobile: +44 (0) 7766 906514
E-Mail: paul.esson < at > redstor.com
Web: www.redstor.com
REDSTOR LIMITED
Torridon House
73-75 Regent Quay
Aberdeen
UK
AB11 5AR
Disclaimer:
The information included in this e-mail is of a confidential nature and
is intended only for the addressee. If you are not the intended
addressee, any disclosure, copying or distribution by you is prohibited
and may be unlawful. Disclosure to any party other than the addressee,
whether inadvertent or otherwise is not intended to waive privilege or
confidentiality.

-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER < at > LISTSERV.TEMPLE.EDU]
On Behalf Of Rob Haig
Sent: 07 March 2005 16:18
To: NETWORKER < at > LISTSERV.TEMPLE.EDU
Subject: [Networker] NDMP speeds (with a centera if anyone has one)

We're looking at buying some Centera frames from EMC. Our volume needs
make replication cost prohibitive, (both in hardware and offsite hosting
space) so we're looking at an offsite library that could do (almost
constant) NDMP backups of the data we'll be loading into the Centera.
The sales guy we're working is pushing replication (hmmm....) and
doesn't think that an NDMP client can push enough data for us (we'd need
to sustain about 40MB/s to keep up with our forecast needs).



Does anyone have experience with how much data an NDMP client can push??
And has anyone done so with a Centera?



Thx

--

Rob



Confidentiality Notice: The information contained in this e-mail from
Rob Haig and any attachments is legally privileged or otherwise
confidential. If you are not an intended recipient, you are hereby
notified that any dissemination, distribution or copying of this e-mail
is strictly prohibited. If you have received this e-mail in error,
please notify the sender and permanently delete the e-mail and any
attachments immediately. Thank you in advance for your cooperation.
3/7/2005 10:18 AM

Note: To sign off this list, send a "signoff networker" command via
email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu

Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu

I've never done ndmp before (I'm sure it shows). I'd assume there's a
possibility to do multiple streams with ndmp? So even at the 11M/s
someone else said, 4 streams at that speed would be sufficient.



Confidentiality Notice: The information contained in this e-mail from Rob Haig and any attachments is legally privileged or otherwise confidential. If you are not an intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this e-mail in error, please notify the sender and permanently delete the e-mail and any attachments immediately. Thank you in advance for your cooperation. 3/8/2005 11:58 AM-----Original Message-----
From: Paul Esson [mailto:paul.esson < at > REDSTOR.COM]
Sent: Monday, March 07, 2005 10:47 AM
To: NETWORKER < at > LISTSERV.TEMPLE.EDU
Subject: Re: [Networker] NDMP speeds (with a centera if anyone has
one)

I have seen speeds of 30 MB/s with NDMP where the NAS is a Net Apps
R200
NearStore and the drive is LTO-2. A lot depends on the type of data
being written and whether or not you can keep the drive streaming. An
LTO-2 drive is capable of supporting 40 MB/s write speeds if you can
sustain the data stream to it.


Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu

Lot of data. I come up with 3.5 TBs a day from your figures! Gut feeling is
that you couldn't keep up with it through NDMP. You'd have to have lots of
NDMP tape servers and tape drives. We have not done Centera Backups yet but,
will start soon so


On another Centera note. You also need to worry about object counts. The A
single Centera node/cluster has a limit of 400 million C-clips (the basic
storage object in a Centera). Depending on how your software interfaces with
the Centera you might want to take that limit into account. Some software
(Email Xtender for example) roll all the emails up into a big file then write
to the Centera. Some just push the original objects on to it. SO each
c-clip is say a document , image or whatever. I'd make sure you forecast the
number of c-clips on the system and architect the Centera system around it.
You may need more access nodes etc if this is the case.

http://searchstorage.techtarget.com/originalContent/0,289142,sid5_gci1052147,
00.html?track=NL-390&ad=503730&Offer=W2MYnv4

Hope this helps.

Brian Narkinsky






-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER < at > LISTSERV.TEMPLE.EDU] On
Behalf Of Rob Haig
Sent: Monday, March 07, 2005 11:18 AM
To: NETWORKER < at > LISTSERV.TEMPLE.EDU
Subject: [Networker] NDMP speeds (with a centera if anyone has one)

We're looking at buying some Centera frames from EMC. Our volume needs
make replication cost prohibitive, (both in hardware and offsite hosting
space) so we're looking at an offsite library that could do (almost
constant) NDMP backups of the data we'll be loading into the Centera.
The sales guy we're working is pushing replication (hmmm....) and
doesn't think that an NDMP client can push enough data for us (we'd need
to sustain about 40MB/s to keep up with our forecast needs).



Does anyone have experience with how much data an NDMP client can push??
And has anyone done so with a Centera?



Thx

--

Rob



Confidentiality Notice: The information contained in this e-mail from Rob
Haig and any attachments is legally privileged or otherwise confidential. If
you are not an intended recipient, you are hereby notified that any
dissemination, distribution or copying of this e-mail is strictly prohibited.
If you have received this e-mail in error, please notify the sender and
permanently delete the e-mail and any attachments immediately. Thank you in
advance for your cooperation. 3/7/2005 10:18 AM

Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu

Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu

On Tue, 8 Mar 2005, Rob Haig wrote:

I've never done ndmp before (I'm sure it shows). I'd assume there's a
possibility to do multiple streams with ndmp? So even at the 11M/s
someone else said, 4 streams at that speed would be sufficient.

It may depend on the client involved, but the NDMP clients that I
am responsible for backing up only support disk image backups and
the target sessions for each NDMP device under NetWorker 7.1.3 need
to be set to a value of one; hence only one stream at a time.

Note: To sign off this list, send a "signoff networker" command via email
to listserv < at > listserv.temple.edu or visit the list's Web site at
http://listserv.temple.edu/archives/networker.html where you can
should be sent to stan < at > temple.edu