rubensluque
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Enthusiast

Symmetrix Heterogeneous mode option

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Hi,

I'm not EMC specialist but I've heard some storage guy's talking about set the heterogeneous mode option to EMC Symmetrix storage. In the VMware SAN Configuration Guide I found these recommendations to set on Symmetrix:

\- Common serial number (C)

\- Auto negotiation (EAN) enabled

\- Fibrepath enabled on this port (VCM)

\- SCSI 3 (SC3) set (enabled)

\- Unique world wide name (UWN)

\- SPC2 (Decal) (SPC2) SPC2 flag unset (disabled)

Is the "heterogeneous mode" implicit in the references above ? Is it a kind of LUN ID masking ?

thanks in advance,

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pipedreams
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Contributor

The heterogeneous setting simply enables the C and SC3 flags at the initiatior (hba) level. However it disables the SPC-2 flag which starting with ESX 3.X is a required flag.

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rubensluque
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An EMC professional told me that "Heterogeneous Mode" is a EMC feature of high end storage's like as Symmetrix. When Heterogeneous Mode is enabled, ESX Server can get sequencial LUN ID's from Symmetryx starting with sequencial low numbers such as 1,2,3,4... and storage administrators do not need to be worried to reserve low LUN ID's for ESX Servers. It's a EMC recommendation and it is not described in VMware SAN Guide.

I´ve seen it running and it worked fine!

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pipedreams
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Contributor

The heterogeneous setting simply enables the C and SC3 flags at the initiatior (hba) level. However it disables the SPC-2 flag which starting with ESX 3.X is a required flag.

View solution in original post

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