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7 Thorium

Re: multimapped LUN to ESX hosts from Clariion Array

i believe the limit is 256 per target, so that's probably not it.

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4 Ruthenium

Re: multimapped LUN to ESX hosts from Clariion Array

Perfect, thanks for the information.  That confirms my suspicion and would be why you are not seeing all of the LUNs.

Per v5.1 ESXi host, you have the following limits (which ever comes first😞

1) Maximum LUNs (256)

2) Maximum paths (1024)

http://kb.vmware.com/kb/1003497

For ESXi 5.1, as seen in the section "Storage Maximums" you will see the following:

1) LUNs per Server: 256

2) Number of total paths on a server: 1024

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7 Thorium

Re: multimapped LUN to ESX hosts from Clariion Array

256 max per host or per target ?

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Re: multimapped LUN to ESX hosts from Clariion Array

256 per server

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4 Ruthenium

Re: Re: multimapped LUN to ESX hosts from Clariion Array

dynamox wrote:

256 max per host or per target ?

Per host.  For ESXi (with its early Linux foundation) has a total count for LUN and/or paths that can't be exceeded regardless of the number of arrays.

For example, the LUN count is controlled by the following Advanced (Software) Setting available via the following breadcrumb trail in the vSphere Client:

1) Configuration > Software > Advanced Settings

2) Disk > Disk.MaxLUN

By default it is 256 (and is also the total maximum).

However, if you exceed 1024 total paths (again per host regardless of the number of arrays) before reaching 256, than that would be the limiting factor instead.  So as an example for others that might stumble on this:

1) Lets say I have for each hosts I have (zoned) 8 paths to the VMAX and 8 paths to the VNX

2) Then I would not be able to reach 256 LUNs but instead could only present 128 LUNs

EDIT: Removed comment about vSphere v5.1 maximum paths per LUN (it is 8 when using iSCSI but used FC as an example)

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7 Thorium

Re: Re: multimapped LUN to ESX hosts from Clariion Array

thanks, mixed up with an older RHEL Qlogic limit of 256 LUN per target.

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