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SP A and B Balance
Currently I have 6 shelves of FC drives (72GB and 300GB) and just added a shelf of 15 SATA II 1 TB Drives.
I am setting up two RAID 5 Groups 6+1 with a hot spare.
Currently there is no rhyme or reason as to which LUN's are associated to SP A or B. My question is would you assign the first RAID Group to SP A and the second to SP B? Like I said there does not appear to be any rhyme or reason as to how they were assigned before.
Best practices appear to say balance load across both SP's but does not really clarify if my putting all of the first set on A to be an issue or not.
Thanks!
I am setting up two RAID 5 Groups 6+1 with a hot spare.
Currently there is no rhyme or reason as to which LUN's are associated to SP A or B. My question is would you assign the first RAID Group to SP A and the second to SP B? Like I said there does not appear to be any rhyme or reason as to how they were assigned before.
Best practices appear to say balance load across both SP's but does not really clarify if my putting all of the first set on A to be an issue or not.
Thanks!
jps00
392 Posts
0
July 16th, 2009 04:00
No. In many cases users find it easier to provision this way. The LUN Provisioning section in Glen's suggested reading: EMC CLARiiON Best Practices for Performance and Availability, FLARE Revision 28.8 contains a lengthy discussion on LUN provisioning and balancing.
Balancing the load across RAID groups, back-end buses, and Storage Processors is an important concept with the CLARiiON. It is how you get the highest utilization and best performance out of the storage system. You can find a higher-level discussion of these resources and how to balance across them in the EMC CLARiiON Storage System Fundamentals for Performance and Availability. Both these documents are available on PowerLink.
kelleg
4.5K Posts
1
July 15th, 2009 14:00
You might want to review these documents - I've included both FLARE 26 and FLARE 28 as I'm not sure what type of array you're using.
White Paper: EMC CLARiiON Best Practices for Navisphere Performance in Large Configurations ¿ Best Practices Planning
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/h6099-navisphere-performance-in-large-configurations-wp.pdf
EMC CLARiiON Storage System Fundamentals for Performance and Availability
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1049_emc_clariion_fibre_channel_storage_fundamentals_ldv.pdf
EMC CLARiiON Best Practices for Fibre Channel Storage: FLARE Release 26 Firmware Update - Best Practices Planning
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H2358_clariion_best_prac_fibre_chnl_wp_ldv.pdf
EMC CLARiiON Performance and Availability Release 28.5 Firmware Update Applied Best Practices.pdf
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/h5773-clariion-perf-availability-release-28-firmware-wp.pdf
glen
JaniceHetrick
20 Posts
0
July 15th, 2009 15:00
JaniceHetrick
20 Posts
0
July 16th, 2009 07:00
JaniceHetrick
20 Posts
0
July 16th, 2009 08:00
PS...since the main question was answered...should I start a new thread or is it ok to repost to this as I did...just want to make sure
AranH1
2.2K Posts
1
July 16th, 2009 09:00
First change the SP owner properties of the LUN, then trespass the LUN to the proper SP. You will find this is a common process when managing a CLARiiON array. When deploying LUNs you may not know what the exact performance characteristics of the application will be and may find that the SPs are unbalanced after analyzing the array over a period of time. So it is common to rebalance LUNs to achieve optimal load on the array.
Don't worry about starting a new thread, it is your thread and you are on topic still IMHO. The moderators here aren't strict about stuff like that.
JaniceHetrick
20 Posts
0
July 16th, 2009 09:00