This symptom may be observed on PowerStoreOS 3.0 and above, and when adding new drives.
Customers may report less physical capacity than expected after adding new drives compared to the PowerSizer output.
The larger capacity drives may not be fully used depending on multiple conditions such as the RAID tolerance level, the number of drives, the size of the drives, and how the drives were added.
原因
This behavior is "as designed."
There is an internal (hard coded) timer of 5 minutes as the soaking time that the system attempts to add multiple drives to the RAID tier together.
The default RAID width may change dynamically internally when new drives are added and if the criteria are met.
If larger capacity drives have been added, and if the total number of larger drives does not reach the (new) default RAID width (for example 10 or 18 for Double Drive Failure Tolerance Level) +1 for spare, the physical capacity of each larger drive may not be fully used and adjusted to the smaller size of the existing drives.
解決方法
Workaround:
If new drives have been added, and the physical capacity is as expected:
There is no issue, no action is required.
If new drives have been added, and the physical capacity is lower than expected:
Contact Dell Technical Support to evaluate the conditions and available options. Reference this KB Article in the Service Request for expedited handling.
Best practice for adding multiple new drives to be used before adding new drives:
Wait at least 10 seconds between adding each drive.
Do not exceed 2 minutes between adding each drive.