Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 127

Displaying Space-Borrowing Information, Borrowed Space

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The borrowing capabilities added for v8.0 and later can help in the following situations: • If a volume's snapshot reserve or replica reserve is set too high or too low: - Too high - The system considers the unused snapshot and replica reserve as "borrowable" space, which is then available to other volumes whose reserves were set too low. This flexibility accommodates volumes whose IO patterns caused the volume reserves to be exceeded and better utilizes the available space. - Too low - The system allows snapshots and replicas to borrow space, which maintains the max-keep policy. Older snapshots and replicas will not need to be deleted if the system can borrow space for them. • If replica reserve is configured to be too small or too large: - Too small - The system allows the replicas to borrow from outside their replica reserve, which maintains the max-keep policy. - Too large - The system enables other snapshots and replica sets in the pool to borrow the unused space. Displaying Space-Borrowing Information The Group Manager GUI can help you monitor borrowed space on your system. To see borrowing information, either: • Click Group → Borrowed Space. NOTE: This display applies only to the space in the pool that is available for borrowing, not to all of the space in the pool. Volume reserve and storage containers do not appear in the tables because that space cannot be borrowed. • Click the Total borrowed space link from either the Group Disk Space panel or the Pool Disk Space panel. PS Series Group Operations 127

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The borrowing capabilities added for v8.0 and later can help in the following situations:
•
If a volume’s snapshot reserve or replica reserve is set too high or too low:
–
Too high – The system considers the unused snapshot and replica reserve as “borrowable” space, which is then available to
other volumes whose reserves were set too low. This
flexibility
accommodates volumes whose IO patterns caused the
volume reserves to be exceeded and better utilizes the available space.
–
Too low – The system allows snapshots and replicas to borrow space, which maintains the max-keep policy. Older snapshots
and replicas will not need to be deleted if the system can borrow space for them.
•
If replica reserve is
configured
to be too small or too large:
–
Too small – The system allows the replicas to borrow from outside their replica reserve, which maintains the max-keep policy.
–
Too large – The system enables other snapshots and replica sets in the pool to borrow the unused space.
Displaying Space-Borrowing Information
The Group Manager GUI can help you monitor borrowed space on your system. To see borrowing information, either:
•
Click
Group
→
Borrowed Space
.
NOTE: This display applies only to the space in the pool that is available for borrowing, not to
all
of the space in the
pool. Volume reserve and storage containers do not appear in the tables because that space cannot be borrowed.
•
Click the
Total borrowed space
link from either the Group Disk Space panel or the Pool Disk Space panel.
PS Series Group Operations
127