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Qsan Document – User Manual
C * P = I * S *D * T
So we can estimate the warm up time, at least.
T = (C * P) / (I * S * D)
The real case may be longer than the estimate time. Here we take an example on the following.
I: 250 IOPS (Random IOPS per HDD)
S: 64KB (Web service)
D: 16 HDDs
C: 480GB (1 SSD)
P: 2 (Populate-on-read threshold)
Warm up time T = (480GB * 2) / (250 * 64KB * 16) = 3932.16 seconds = 65.536 minutes
Configuration
Activate the license key
User needs to obtain a license key and download it to the system to activate the SSD caching
function in
System Maintenance -> Upgrade -> SSD Caching License
. Each license key is unique
and dedicated to a specific system. To obtain the license key, please contact sales for assistance.
Take an example of enabling SSD caching.
1.
After creating a virtual disk, click
▼
-> Set SSD Caching
of the selected virtual disk.
2.
Check
Enable
box.
3.
Select the policy by drop down menu.
4.
Click
Select Disks
button, and then check the SSDs which are provided for SSD caching.
5.
Click
OK
button to enable SSD caching.
