Quite a few customers have been asking how they could get massive cache on their Cisco UCS blades. It is really quite simple – with three steps to follow in UCSM:
1. Configure “Local Storage Configuration Policy”
The B200M4 blades are equipped “FlexFlash”, dual SD slots for installing ESXi. Ensure “FlexFlash” is enabled for the local storage configuration policy. Two SD cards are recommended for redundancy. Leveraging FlexFlash to install and boot ESXi will eliminate the need to configure RAID for the local SSDs. Therefore, “No RAID” can be selected as the the mode of operation for the local SCSI controller. There is absolutely no need to log into the SCSI controller BIOS during blade boot up – just configure the policy once, and use it across the board with each blade server in the chassis.
2. Attach policy to service profile template
Two simple settings to apply:
a)ensure the template is created as an “updating template”: any updates to the template will automatically roll out changes to all blades that are attached to the service profile template
b)ensure the local storage configuration policy defined in step 1) above is selected within the service profile template
3. Power on the blades and enjoy massive cache for your VMs
Two blade slots with 1.6TB SSD drive each will give your VMs ~3.2TB of raw flash capacity. With DVX data reduction (inline dedupe and compression) of 5X, each ESXi host can enjoy over 15TB of effective cache. Don’t worry about setting application policies to enable/disable cache, or pin certain applications volumes/LUNs to flash – just use more, and think less.
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