Adding extra storage to Celerra

You can have 256 LUNs in a storage group, Celerra does not support MetaLUNs. How are existing LUNs sized ?

Hey Dynamox,

we are running Celerra NS40G with 5.6 version.... we already have 100 lun's in the storage group of clariion. I am not that sure how many lun's we can add in a storage group. Can i create 6 lun's and create a meta out of them and add it to celerra.

Some lun are 458GB and some are 500GB.  I have 2 big raid groups of 8254GB am not sure how many lun's i can create of that raid group. can you suggest me?

look again - 5.6.4 was never released externally

3rd number has to be 2 digits

no meta's

and stick to the supported RAID types and raid group sizes as documented on Powerlink

max. LUN size depends on your DART rev - older ones can only use up to 2TB

Rainer

This is the full version of celerra 5.6.4. Am trying to add SATA disks.

To add - what is the full version of NAS Code - you mentioned 5.6 code - but we need to know full code to ensure that LUNs greater than 2 TB is supported by the NAS code running.

Also, we need to know what type of disks you are adding - are these FC or SATA disks?

There are certain guidelines for the RAID Group and LUN configuration - it depends on whether these are FC or SATA.

Thanks,
Sandip

it is 5.6.40-3

started with code 5.6.44.4 you can create LUN > 2TB on NS-960 as well as NS-40G, NS-80G, NSX, and NS-G8 NAS gateways when attached to CX3, CX4, and Symmetrix DMX-4 backends. So your LUNs have to be below 2TB, i typically take my raid group and divide it into equal size LUNs as long as they are below that limit. Make sure you adhere to these guidelines:

http://corpusweb130.corp.emc.com/ns/common/post_install/Config_storage_integrated.htm

Or consider upgrading.  There have been a pretty large number of enhancements and bugfixes since 5.6.40 was released nearly two years ago, including > 2TB LUN support.  Check the Celerra Release Notes for details, but you should really seriously consider scheduling an upgrade.

it doesnt really matter as long as you stick to supported configs and keep some best-practices in mind like:

create equal-sized LUNs

no metas

balance across SP's

dont stripe between LUNs on the same RG

multiples of 2 or 4 LUNs are preferred to help AVM

Just to be clear I think you mentioned it was ATA drives you are installing. The rules for ATA drives are slightly different. See the following extract taken from a Celerra 5.5 Performance white paper. I guess it's still the same but maybe an EMC'er could clarify.

NAS Engineering recommends that RAID groups consisting of FC drives be split into two LUNs, one of which is owned by SP A and the other by SP B.

However, there are differences between DAE2-FC and DAE2-ATA enclosures. The design of the DAE2-ATA requires that LUNs in a given RAID group all be owned by the same SP, or performance will be degraded. Never split LUN ownership between SP A and SP B for LUNs in a single RAID group housed on ATA disks. Instead, for the sake of consistency, EMC recommends that SP A wholly owns the first RAID group and that SP B owns the next RAID group, with ownership continuing to alternate for additional RAID groups.

that requirement no longer applies to 4 Gbit/sec DAE3P/DAE4P with CX3 and higher. See emc157746

Thanks for the reply I didn't realise that. Thanks.