The reserved snapshot volume is full and the older snapshots are getting deleted
The Snapshot space recovery policy on the Dell EqualLogic array is by default set to delete the older snapshots when the reserved snapshot volume is out of disk space. You can change this option and select to set the volume and its snapshots offline when the reserved snapshot volume exceeds the allotted disk space.
Snapshot creation fails
The Snapshot creation may fail if you have upgraded the firmware version and did not reset the password for the user account which you were using to access the previous version of the firmware.
After upgrading the firmware, do either of the following:
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Create a new group administration account in the firmware, and set the desired permissions for this account.
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If you plan to use the existing administration accounts from version prior to 4.2.0, reset the password for these accounts. The password can be the same as the original.