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December 2nd, 2008 13:00
Question about increasing performance by adding disks
Pretty simple and maybe obvious but I want to make sure. I've been supporting our NS500 Celerra for almost 2 years. It's primary job is MS Exchange 2003 storage. We've grown a lot and the storage has dwindled. Aside from Email archiving which is underway I was thinking about adding more spindles. If I add say 2 disks and extend my iscsi file system, will the Celerra automatically take advantage of those new spindles and therefore help performance?
Thanks-
Thanks-
Rainer_EMC
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December 2nd, 2008 14:00
as far as extending goes - if the file system contain the ISCSI LUNs you need more space from is built on RAID1 then you can add another RAID1 group with two disks.
If its built on RAID5 you would have to add a RAID5 group of the same size.
AVM will not automatically re-stripe the data - it will do a concat so you wont get more disks involved for the existing part of the data.
If you extend the ISCSI LUN it will make use of the new disks so that in aggregrate you get all disks involved but not for all of the data. Depending on how Exchange allocates its block this will be more or less noticeable over time.
If you want it to stripe across all you would have to "move" the file system, create a new one and move it back.
You could do that either with Celerra Replication, backup/restore or from the client side