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SANTastic1

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March 26th, 2009 05:00

CX3-80 FLARE 28 MAX LUN SUPPORTED

Hi

Could anyone please tell me what the maximum number of supported luns are on Flare 28 on a CX3-80.?We have hit our lun max on flare 26 and i'm looking to find a way to use the storage we have on this array.

Thanks

chris
  • S

    sagle

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    Posted March 30th, 2009 11:00

    Keep in mind the number of managed objects in the array as well. Each 4-way meta is 4 objects the array has to manage. Every device (disk, storage group, initiator, etc. counts as an object) We have experienced increased SP cpu usage and very bad management performance (not array performance, naviseccli and navi gui extremely slow) when the object count gets too high. This number depends on many factors, but in our environment about 1500 to 2000 is when the issues occurs. We had an old cx700 with all 4-way metas that had very high SP cpu usage. We LUN migrated all the 4-ways to regular LUNs and we saw a 30% drop in cpu usage on each SP. YMMV :)
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    SANTastic1

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    Posted March 26th, 2009 06:00

    I'm not concerned about the storage group maximums really. Basically we have a CX3-80 fully loaded with 1TB SATA2 disks. We've been created RAID 5 (4+1) then striping metaluns across these. This approach means that you create a lot of luns as components for what is ultimately one LUN to be presented to a host. So we've now hit the maximum whereby we can't create any more LUNs on the array despite the fact that we have about 30TB of usable disk on there. I'm just looking for a way around this (I suspect there's none!)
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    SANDoozer

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    Posted March 26th, 2009 06:00

    Also, unless I've completely lost my mind, I think rel 28 is only available for the CX4 series.
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    SANTastic1

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    Posted March 26th, 2009 06:00

    Hi

    Thanks for the reply. I was referring to the array maximum rather than per single host. Do you have any documentation where this is referred to? I thought that with CX4 series the maximum had been increased so wondered if this was also the case with a CX3-80 running Flare 28
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    SANDoozer

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    Posted March 26th, 2009 06:00

    There is a limit of 256 (0-255) LUNs per storage group. This is a hard limit that I don't expect would ever change for the CX3 series. A host can only exist in one storage group on a single array, so the only way around this limit would be another array. I'll look for a doc to link. I hope this helps.
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    SANDoozer

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    Posted March 26th, 2009 06:00

    I believe that the maximum is still 2048. Are you refering to that maximum, or the maximum per a single host?
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    SANDoozer

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    Posted March 26th, 2009 07:00

    I'm sorry, I misread your post.

    I don't know of any way around the limit of 2048. The only thing I can suggest is a change to your approach on the way your carve LUNs.
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    AranH1

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    Posted March 26th, 2009 07:00

    FLARE 28 is for Cx4 systems only. FLARE 26 is the current (and probably last) FLARE for Cx3 and Cx series arrays.

    The 2048 LUN limit is a hard limit in a Cx3-80. On the Cx4-480 and Cx4-960 the limit is doubled to 4096. But I believe the MetaLUN limit is 1024 on the Cx4-480 and 2048 on the Cx4-960.
  • D

    dynamox

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    Posted March 26th, 2009 08:00

    might have to delete some LUNs ...create new MetaLuns with bigger size but less number of component luns and then use Lun Migrator to move them around.

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