SAN Health Utility

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New Contributor
Posts: 3
Registered: ‎04-16-2008

SAN HEALTH and ISL

Somebody say me what "Fan Out Ratios Dvc:ISL" means. i have 24:1 and the SAN Health report say me "Further investigation is necessary".
What can i do ?
Thank you.

Super Contributor
Posts: 425
Registered: ‎03-03-2010

Re: SAN HEALTH and ISL

You need to understand the ISL over  subscription ratio:

It is defined as total BW of the devices using the ISL BW. It should be 3:1/7:1

24:1 means your total no of devices are mor eand your ISL is less, which is required.So increase an ISL trunk i.e. if it is 8 Gbps /16 Gbps, add one isl to the trunk and make it 12 Gbps/24 Gbps. and then run SAN health, you will not get the message for further investigation.

You should not increase the connectivity of your devices only, you have to increase the ISL if the devices are not localized and using ISLs

Pls find attached the doc for trunking .

If you find it correct pls make it correct

New Contributor
Posts: 3
Registered: ‎04-16-2008

Re: SAN HEALTH and ISL

thank you very much

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