Viewing I/O Priorities

Prerequisites

At least one LUN, snapshot, or file system has been created.

Context

• When you create a LUN, specify an I/O priority for the LUN. If the I/O priority is not specified, the LUN will be granted the low priority by default.
• The created snapshot or file system will be granted the low priority by default.
• After a LUN, snapshot or file system is created, its I/O priority can be manually changed.

Procedure

1. Log in to DeviceManager.
2. Choose Provisioning > Resource Performance Tuning > SmartQoS.
3. Click the Priority Control tab page.
4. Select LUN, Snapshot, or File System from the Resource Type drop-down list. View the I/O priorities information.
   Table 3-1, Table 3-2, and Table 3-3 describe the related parameters.

   Table 3-1 LUN parameters

   Parameter	Description	Setting
   I/O Priority	Priority control of a LUN	[Example] Low
   Name	Name of a LUN.	[Example] LUN001
   ID	ID of a LUN.	[Example] 1
   Health Status	Health status of a LUN.	[Example] Normal
   Running Status	Running status of a LUN.	[Example] Online
   Type	Type of a LUN.	[Example] Thick LUN
   Capacity	Capacity of a LUN.	[Example] 1 GB
   Owning Storage Pool	Storage pool to which a LUN belongs.	[Example] Storagepool1
   Mapping	Mapping status of a LUN.	[Example] Unmapped

   Table 3-2 File system parameters

   Parameter	Description	Setting
   I/O Priority	I/O priorities of a file system.	[Example] Low
   Name	Name of a file system.	[Example] FileSystem001
   ID	ID of a file system.	[Example] 1
   Health Status	Health status of a file system.	Normal
   Running Status	Running status of a file system.	Online
   Type	Configuration type of a file system.	[Example] Thick File System
   WORM	WORM mode of a file system.	[Example] Regulatory compliance
   Total Capacity	Total capacity of a file system.	[Example] 100.000 GB
   Available Capacity	Available capacity of a file system.	[Example] 50.000 GB
   Owning Storage Pool	Storage pool to which a file system belongs.	StoragePool000
   Allocated Capacity	Allocated capacity (including the prefetch capacity) of a file system.	[Example] 1.000 GB

   Table 3-3 Snapshot parameters

   Parameter	Description	Setting
   I/O Priority	I/O priorities of a snapshot.	[Example] Low
   Name	Name of a snapshot.	[Example] Snapshot001
   ID	Snapshot ID.	[Example] 11
   Health Status	Indicates whether a snapshot is normal. The possible value can be Normal or Fault.	[Example] Normal
   Running Status	Indicates whether a snapshot is working properly. The possible value can be Activated, Restore, or Inactive.	[Example] Activated
   Source LUN Name	Name of the source LUN of a snapshot. Source LUN is a LUN where source data resides.	[Example] lun005
   Source LUN ID	ID of the source LUN of a snapshot.	[Example] 1
   Snapshot Capacity	Capacity of a snapshot.	[Example] 1.000 MB
   Allocated Capacity	Storage pool capacity allocated to a snapshot. After a snapshot is activated, the data capacity and metadata capacity allocated to the write snapshot exclude the data protection capacity of the source LUN. The metadata capacity is about 1% of the data capacity.	[Example] 128 MB
   Activated At	Time when a snapshot is activated.	[Example] 2013-11-16 14:12:25 UTC+08:00
   Mapping	Indicates whether a snapshot is mapped to a mapping view. The possible value can be Mapped or Unmapped.	[Example] Unmapped
   WWN	WWN of a snapshot.	[Example] 010235G6LLZ0B8xxxxxx
   Rollback Start Time	Time when a snapshot rollback starts.	[Example] 2014-05-30 10:15:45 UTC+08:00
   Rollback End Time	Time when a snapshot rollback ends.	[Example] 2014-05-30 10:15:45 UTC+08:00
   Rollback Progress	Progress of a snapshot rollback.	[Example] 50
   Rollback Speed	Snapshot rollback speed, including Low, Medium, High, and Highest. When service load on the storage system is heavy, set the rollback speed to Low or Medium. When service load on the storage system is not heavy, set the rollback speed to High or Highest.	[Example] Highest