Add FC volume: Difference between revisions
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This function allows adding a new volume to a pool or edit the already existing one. It is possible to assign a volume to the selected FC groups. Volume assigned to a FC group contains additional configuration of underlying device. Following options are available for device configuration: | |||
*SCSI ID - unique identifier of a device, it is recommended to leave this field empty and allow the system to use an identifier generated for volume | |||
*Access mode: | |||
**Write-through - data is saved directly onto underlying device | |||
**Write-back - data is saved into device cache, this setting takes effect only if the underlying storage devices are set to use write back cache, otherwise, it gives no effect. This option is not available in the Block I/O mode. | |||
**Read only - write is not allowed to the device | |||
*I/O mode: | |||
**File I/O - in this mode the LUN is accessed as a file which allows the system to use page cache, this mode may give better performance over Block I/O mode. | |||
**Block I/O - in this mode the LUN is directly accessed as a block device. | |||
*FC groups - it is possible to select to which FC groups volume will be attached along with specifying a LUN for each group if needed. By default, next free LUN is used in the group. It is recommended to have LUN 0 in the group, otherwise resources may not be visible to some initiators. | |||
<br/>Volume assigned to each group may have different numbers but the remaining configuration of an underlying device is shared among the groups. For more information about configuration of the pool volume please refer to the add zvol section. For more information about FC groups please refer to the FC groups section. | |||
[[Category:Help topics]] | |||
Latest revision as of 13:12, 28 March 2019
This function allows adding a new volume to a pool or edit the already existing one. It is possible to assign a volume to the selected FC groups. Volume assigned to a FC group contains additional configuration of underlying device. Following options are available for device configuration:
- SCSI ID - unique identifier of a device, it is recommended to leave this field empty and allow the system to use an identifier generated for volume
- Access mode:
- Write-through - data is saved directly onto underlying device
- Write-back - data is saved into device cache, this setting takes effect only if the underlying storage devices are set to use write back cache, otherwise, it gives no effect. This option is not available in the Block I/O mode.
- Read only - write is not allowed to the device
- I/O mode:
- File I/O - in this mode the LUN is accessed as a file which allows the system to use page cache, this mode may give better performance over Block I/O mode.
- Block I/O - in this mode the LUN is directly accessed as a block device.
- FC groups - it is possible to select to which FC groups volume will be attached along with specifying a LUN for each group if needed. By default, next free LUN is used in the group. It is recommended to have LUN 0 in the group, otherwise resources may not be visible to some initiators.
Volume assigned to each group may have different numbers but the remaining configuration of an underlying device is shared among the groups. For more information about configuration of the pool volume please refer to the add zvol section. For more information about FC groups please refer to the FC groups section.