Monitoring File System Compression - IBM Storwize V7000 Unified Problem Determination Manual

5. Prevent the file system from running out of capacity again:
6. Return spare drives to the system: To ensure that drive redundancy is not

Monitoring file system compression

You can use the management GUI to monitor file and file system pool capacity
metrics in a single view by selecting Monitoring > Capacityand Files > File
Systems > Storage pools.
You can use two views to monitor the capacity usage on the system. Select
MonitoringCapacity to display a consolidated view of all information needed to
monitor capacity-related information on the system. In addition, you can create
alerts on capacity where you are notified when a specified capacity threshold has
been reached for file system or storage pool capacity. The Capacity View shows
system-wide compression savings and thin provisioning efficiency on storage pool
level.
The most important metric to monitor is the physical capacity that is used in the
storage pool. Make sure the physical allocation does not exceed the specified
threshold. The default threshold is set at 80%. To reduce the current utilization of
the used capacity, more physical capacity needs to be added to the storage pool or
data needs to be deleted from the file system. To view the current level of
utilization for block storage pools that are used for file system compression, select
Files > File Systems and ensure that the Storage pools filter is selected. The
management GUI displays all the file systems and their associated storage pools.
Select the file system and expand the file system pool to display the block storage
disks that the file system uses Right-click the compressed file system that
went offline and select Start All Disks.
To decrease the file system capacity, you can remove the disks (NSD) and the
corresponding mapping to block volumes to force migration of the data to
other NSDs, thus freeing up space on the file system. To remove an NSD,
contact IBM Remote Technical Support.
compromised, spare drives that were used to bring the offline file systems back
online need be replaced either by returning the original drive back to its spare
use or by adding a new drive to the system. Ensure that the file system
capacity has been decreased accordingly before returning the spare drives to
the systems. To return the drive back to its spare use, complete these steps:
a. In the management GUI, select Pools > Internal Storage.
b. From the list of drives that display, ensure that no MDisk are associated
with the drive. If the drive is associated with MDisk, select Pools > MDisks
by Pool. Right-click the MDisk and select Remove from Pool.
c. In the management GUI, select Pools > Internal Storage.
d. From the list of drives that display, right-click a drive you marked as a
candidate in Step 1 and select Mark as... > Spare .
e. Click OK.
To add additional drives to the system, complete these steps:
a. Acquire additional drives from IBM or vendor.
b. Install drives into available drive slots on the enclosure. See Installing a
hot-swap hard disk drive.
c. After the drives are available, select Pools > Internal Storage.
d. From the list of drives that display, right-click the new drive and select
Mark as... > Spare.
Chapter 8. Troubleshooting compressed file systems
303