Principles of automatic thin provisioning

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Principles of automatic thin provisioning:
Automatic thin provisioning provides users with thin LUNs. The resource pool that provides storage space is called thin pool. The system assigns storage space to an application according to its actual requirement. When the assigned thin LUNs fail to meet the requirements, the system assigns extra storage space to the application from the thin pool.

Other related questions:
Application scenarios of automatic thin provisioning
Application scenarios of automatic thin provisioning: Automatic thin provisioning is applicable to various storage scenarios and in most cases can replace traditional LUNs and improve cost-effectiveness. Thin provisioning is service-sensitive. Its work efficiency varies with the services. It is particularly applicable in situations where high I/O performance is not demanded. Dynamic capacity allocation depends on the architecture of a file system. For the file systems such as NTFS, the data is stored on the beginning of a disk, and the capacity utilization rate is high even when the data amount is large. However, for the file systems such as EXT, where the data is stored in a distributed manner, automatic thin provisioning may cause the waste of storage resources.

VM disk configuration modes and their differences
There are three VM disk configuration modes: Common: The system allocates disk space based on disk capacity. During disk creation, any data remaining on the physical device will be reset to 0. This mode results in better disk performance than the others, but disks take longer to create. Thin provisioning: In this mode, the system initially only allocates part of a disk's configured capacity. The rest is allocated as needed based on its storage usage, until all of the configured capacity has been allocated. Thick provisioning lazy zeroed: The system allocates disk space based on disk capacity. Unlike common mode, however, any data remaining on the physical device is only zeroed out on the first data write from the VM. This mode creates disks faster than common mode, and its I/O performance falls between that of the common and thin provisioning modes.

Automatic laser shutdown on the SL64 board of the OSN 9500
When one end does not receive optical signals, it reports an R_LOS alarm to automatically shut down the laser, and the peer end shuts down its laser after receiving the R_LOS alarm. To ensure that light emitting can be immediately recovered after a fault is rectified, the lasers on the ports at both ends are turned on every other minute and the turn-on state of the lasers is kept for 2 seconds. If the fault persists, the lasers will be kept shutdown for 1 minute. The lasers at both ends are recovered if optical signals can be received immediately after the fault is rectified.

Principles for automatic discovery of electrical-layer TE links for ASON services
Electrical-layer TE links for ASON services are verified through electrical-layer overhead bytes. For the principles of automatic TE link discovery, see the ASON User Guide.

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