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What we would do is ensure <br />
<br />
1. No VMs using datastore<br />
2. Remove datastore<br />
3. Remove LUNs from all hosts<br />
4. Enable CHAP<br />
5. Reconfigure ESXi with Chap<br />
6. Reconnect LUNs<br />
7. Recreate datastores<br />
<br />
Otherwise LUNs will disconnect datastores will become inassessible and turn into a mess and can cause iSCSI to retry causing host to spin out of control with high CPU polling
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What we would do is ensure

1. No VMs using datastore
2. Remove datastore
3. Remove LUNs from all hosts
4. Enable CHAP
5. Reconfigure ESXi with Chap
6. Reconnect LUNs
7. Recreate datastores

Otherwise LUNs will disconnect datastores will become inassessible and turn into a mess and can cause iSCSI to retry causing host to spin out of control with high CPU polling

snyderkv

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I'm about to set mutual CHAP authentication up on my storage and then my ESXi hosts but was wondering if I can set it up on my storage first for both incoming and outgoing without blocking any new LUNs coming online? We won't be setting CHAP up on the ESXi hosts until later.<br />
<br />
My other question was since all our LUNs are already connected, will a temporary disconnect of storage reconnect them using CHAP or does CHAP initiate only for new LUNs? <br />
<br />
Thanks
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I'm about to set mutual CHAP authentication up on my storage and then my ESXi hosts but was wondering if I can set it up on my storage first for both incoming and outgoing without blocking any new LUNs coming online? We won't be setting CHAP up on the ESXi hosts until later.

My other question was since all our LUNs are already connected, will a temporary disconnect of storage reconnect them using CHAP or does CHAP initiate only for new LUNs? 

Thanks

CHAP on storage/ESX hosts

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.