Comments on: SAN / EMC: CX4 DAE (Drive Shelf) Information

By: SAN / EMC: Clariion CX4 Solid State DAEs (Shelves) « Colocation to Virtualization

Wed, 03 Jun 2009 08:01:28 +0000

[...] CX4 DAE (general) information http://blog.colovirt.com/2009/05/29/san-emc-cx4-dae-drive-shelf-information/ [...]

By: Andrew Storrs

Andrew Storrs — Sat, 30 May 2009 17:59:54 +0000

“The highest IO luns were vertically striped between 2 DAEs” Did you create RAID groups and LUNs that spanned DAEs or did you use MetaLUNs?

By: kcollo

kcollo — Sat, 30 May 2009 13:50:34 +0000

It is a CX4-240. performance is not an issue currently setup with 100 – 400g 10krpm and 15- 300g 15krpm disks. All raid groups setup with raid 10. The highest IO luns were vertically striped between 2 DAEs. One at the end of the first bus and other at the start of the next. I just wanted to make sure the logic was correct concerning the LCC links.

By: Andrew Storrs

Andrew Storrs — Sat, 30 May 2009 03:49:17 +0000

Yes you have the right idea. The CLARiiON CX4 series has 4 Gb/s throughput end-to-end. What model CX4 are you working with? Also what is the configuration (# of DAE’s, types of disks, etc). And finally what are you trying to do that needs more bandwidth, we can probably help you come up with an alternative disk/LUN layout that gets what you need.

Also don’t forget unless you have the new 8 Gb FC or 10 Gb iSCSI (are those even out yet?) UltraFlex I/O modules you are going to be limited to 4 Gb ports anyway (yes I realize you could have anywhere between 2 and 12 per storage processor depending on the array type and how you’ve populated things) – but don’t forget ALL the traffic on the array is flowing through those.

Give me a better idea of what you have and what you want and I’m sure we can figure something out. :)