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Julien_LECORRE
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August 29th, 2011 05:00
VTLU Configuration
Hi,
I have read the documentation but i need some advice regarding a backup configuration.
Probably backup neewbies questions.....
I have the following configuration:
Site 1:
VNX5300 with 3 Production FS
Site 2:
VNX5300 with Replicate FS and VTLU also seeing tape drives
NEO2000 with 2 drives FC
Networker Server 7.6 SP2
Between the site, i have of course network replication with replicator but also ISL link for FC.
I have a question regarding the good "best practice".
First question:
Can i backup my site 2 with Replicate FS [Read Only] on the VTLU ?
If yes does it always use the network in order to backup or does it use "internal" FC copy ?
Do you pro/cons between using VTLU on NAS or create storage on Networker Server for Backup2disk ?
Second question:
Is there some best practices with the creation of the VTLU with Networker [have seen in the doc that there is somme specification with TSM] ?
Third question:
I have seen that tape cloning is support. How the cloning is perform, FC or network ?
Last question:
Does you guys still using VTLU on NAS ?
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Posted September 2nd, 2011 08:00
Thanks Rainer for your useful answer as always.
When you say "software loopback interface" do you mean mge0 and mge1 ? More or less this what you do with VNX Replication between 2 local DM ?
If so it is for me always network...and the performance associate is not so great.
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Posted September 3rd, 2011 08:00
no I meant loop 127.0.0.1
between data movers the extenal interfaces should be used - mge0/1 is only for control and not for data traffic
After all it is a network NDMP VTLU and not a general one
If you want FC performance you need to get a FC VTLU
Rainer
Rainer_EMC
6 Operator
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8645 Posts
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Posted August 29th, 2011 05:00
Hi Julien,
I dont think many customers are using the Celerra VTLU functionality.
Probably because its limited to NDMP backups only and you typically have to pay similar license fee’s on the backup software than for the B2D software, which is more flexible.
Also most customers don’t want the backup on the same device as the primary data.
The other popular choice is a real VTLU like a EMC Data Domain – which cant be beaten in terms of deduplication and performance.
Yes, you can backup readonly file systems.
If you backup a file systems that’s on the same data mover as the VTLU then it will use a software loopback interface.
Otherwise it will use the external data mover interfaces – except of course to read/write to the disks.
Cloning is up to the backup software – basically it reads a backup from one drive and writes it to another.
For cloning from the VTL to a tape drive on the same data mover I’m not sure – it probably uses loopback like a ndmpcopy.
That might depend on the backup software.
Rainer