6.5.1

Table Of Contents
SSD
SSD
SSDSSD
SSD
SSD
VM
Flash
Storage
Devices
I/O Path
I/O Path
Flash
Storage
Devices
Cache Filter
Virtual
Machine
Cache
ESXi
Virtual Flash Resource (VFFS)
To set up a virtual flash resource, you use flash devices that are connected to your host. To increase the
capacity of your virtual flash resource, you can add more flash drives. An individual flash drive must be
exclusively allocated to a virtual flash resource and cannot be shared with any other vSphere service,
such as vSAN or VMFS.
Flash Read Cache and caching I/O filters are mutually exclusive because both functionalities use the
virtual flash resource on the host. You cannot enable Flash Read Cache on a virtual disk with the cache
I/O filters. Similarly, if a virtual machine has Flash Read Cache configured, it cannot use the cache I/O
filters.
System Requirements for I/O Filters
To be able to use I/O filters in your environment, you must follow specific requirements.
The following requirements apply.
n
Use the latest version of ESXi and vCenter Server compatible with I/O filters. Older versions might
not support I/O filters, or provide only partial support.
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Check for any additional requirements that individual partner solutions might have. In specific cases,
your environment might need flash devices, extra physical memory, or network connectivity and
bandwidth. For information, contact your vendor or your VMware representative.
vSphere Storage
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