Customer reported that he could not longer write new information on the storage device.  Several Alarms regarding the high utilization were also detected on system.  It was detected that the utilization was over 90% of the storage capacity.  After assessment, and in order to normalize operation ASAP we proceeded to modify the "Read Only Watermark"  This, according to product documentation.  We passed from 90% to 93% and the problem was fixed.  Customer is advised to release via deleting old files

Read-Only Watermark

The default read-only watermark indicates that the used disk capacity occupies 90% of the valid disk capacity. When the used capacity of a node pool reaches the read-only watermark, the system reports a read-only alarm, and refuses data to be written to the node pool.

By default, the recovery threshold of the read-only watermark is 5% lower than the alarm threshold of the read-only watermark. That is, when the used capacity is recovered to lower than 85%, the read-only alarm is cleared, and the system allows data to be written. The alarm threshold and recovery threshold of the read-only watermark are both configurable.

Managing a Node Pool

2. Table 1 Information about a node pool

   Parameter	Description	Setting
   Name	Defines the name of a node pool to facilitate the management and maintenance of the node pool.	[Description] A node pool name contains 1 to 127 characters among letters, digits, hyphens (-), underscores (_), and periods (.). It must start with a letter and cannot end with a hyphen (-), underscore (_), or period (.). [Example] data-pool
   Owning tier	Defines the storage tier to which a node pool belongs.	[Example] tier1
   Read-only watermark alarm threshold(%)	After the node pool capacity usage exceeds the read-only watermark threshold, the system reports an alarm and no data can be written to the node pool. If data is being written to the node pool, the system returns a failure message.	[Description] By default, Read-only watermark means that 90% of the total disk capacity of a node pool is used. Administrators can modify Read-only watermark. The value ranges from 85% to 100%. When the node pool capacity usage is recovered from Read-only watermark to Recovery read-only watermark, the system clears the alarm generated when the read-only watermark threshold is reached and the node pool is not in the read-only state. However, no new data can be written to the node pool. [Default value] 90%
   High watermark alarm threshold(%)	After the node pool capacity usage exceeds the high watermark threshold, the system reports an alarm.	[Description] By default, High watermark means that 85% of the total disk capacity of a node pool is used. Administrators can modify High watermark. The value ranges from 80% to 95%. High watermark must be lower than Read-only watermark. When the node pool capacity usage is recovered from High watermark to Recovery watermark, the system clears the alarm generated when the high-watermark threshold is reached and new data can be written to the node pool. [Default value] 85%
   Recovery read-only watermark recovery threshold(%)	After the node pool capacity usage exceeds the recovery read-only watermark threshold, the system clears the alarm generated when the read-only watermark threshold is reached and the node pool is not in the read-only state. The new data can be written to the node pool.	[Description] By default, Recovery read-only watermark means that 85% of the total disk capacity of a node pool is used. Administrators can modify Recovery read-only watermark. The value ranges from 80% to 95%. Recovery read-only watermark must be lower than Read-only watermark. [Default value] 85%
   High Watermark Recovery threshold(%)	After the node pool capacity usage exceeds the recovery watermark threshold, the system clears the alarm generated when the high-watermark threshold is reached.	[Description] By default, Recovery watermark means that 80% of the total disk capacity of a node pool is used. Administrators can modify Recovery watermark. The value ranges from 75% to 90%. Recovery watermark must be lower than Recovery read-only watermark and High watermark. [Default value] 80%
   Enable Spillover	Specifies whether files can be stored to a migration node pool when the capacity usage of the node pool specified for storing the files exceeds Read-only watermark.	[Description] Disabled Spillover: When new files need to be stored but the capacity usage of the node pool specified for storing the files exceeds Read-only watermark alarm threshold, the files fail to be stored. Enabled Spillover: When new files need to be stored but the capacity usage of the node pool specified for storing the files exceeds Read-only watermark alarm threshold, the files will be stored in a migration node pool. Multi-tier Spillover is not allowed. If node pool A is configured to spill over to node pool B, node pool B cannot be configured to spill over to node pool C. [Default value] Disabled
   Target Node Pool	After Spillover is enabled, a node pool must be selected for storing migrated files. Click Select. In the Select Target Node Pool dialog box that is displayed, select a node pool for storing migrated files. Only one node pool can be selected for storing migrated files. Any node pool: When the used capacity of a node pool reaches the read-only watermark and Spillover is specified, data can no longer be written into the node pool and is written into other node pools. Specified node pool: When the used capacity of a node pool reaches the read-only watermark and Spillover is specified, data can no longer be written into the node pool and is written to the specified node pool.	[Description] Any Node Pool

3. Click OK after the Success dialog box is displayed.

   In the function pane, view the node pool that you have added.