Add group

This function allows You to add Data Group, Write Log, Read Cache, Spare Disks. Please click on a link to show more details :

• Data Group

http://scalelogic-wiki.com/default/wiki/Add_data_group

• Write Log
  • ​ allows to configure the write log function, using a redundancy level (mirror or single drive).A separate-intent log device. If more than one log device is specified, then writes are load-balanced between devices. Log devices can be mirrored. However, raidz vdev types are not supported for the intent log.

• Read Cache
  • ​ A device used to cache storage pool data. A cache device cannot be configured as a mirror or raidz group.These devices provide an additional layer of caching between main memory and disk. For read-heavy workload,where the working set size is much larger than what can be cached in main memory, using cache devices allow much more of this working set to be served from low latency media. Using cache devices provides the greatest performance improvement for random read-workloads of mostly static content.
• Spare disks
  • ​A special pseudo-vdev which keeps track of available hot spares for a pool.ZFS allows devices to be associated with pools as "hot spares". These devices are not actively used in the pool, but when an active device fails, it is automatically replaced by a hot spare. To create a pool with hot spares, specify a "spare" vdev with any number of devices.Once a spare replacement is initiated, a new "spare" vdev is created within the configuration that will remain there until the original device is replaced. At this point, the hot spare becomes available again if another device fails.If a pool has a shared spare that is currently being used, the pool can not be exported since other pools may use this shared spare, which may lead to potential data corruption.Spares cannot replace log devices.