![]() These thin provisioning storage solutions resolve the threshold notification through their proprietary storage management utility. Most thin provisioning storage arrays do not report an event when the threshold is reached. Threshold notification is a required function to alert the host and client application of the storage space consumption state. Threshold and Resource Exhaustion HandlesĪ thin provisioning LUN is usually created with less physical disk space than the size of the LUN. Windows Server logs a system event to alert the system administrator of the provisioning type or LUN capacity change. When the provisioning type or LUN capacity is changed, the storage array raises a UNIT ATTENTION sense condition that returns the correct information when the sense data is requested. ![]() Run-time Provisioning Type or LUN Capacity ChangesĪ storage administrator can change the provisioning type or the capacity of the LUN. When provisioning type information is accurate, the storage stack can provide better I/O handling according to the storage provisioning type. For example, if the storage device reports that it supports the UNMAP command but does not support the UNMAP command, a disk format hang issue might occur. If the storage device does not accurately report its current capability, device compatibility issues might occur. The storage device reports its provisioning type and UNMAP and TRIM capability according to the SBC3 specification. Windows Server adopted the T10 SCSI Block Command 3 (SBC3) standard specification for identifying thin provisioning logical units (LUNs) starting with Windows Server 2012.ĭuring the initial target device enumeration, Windows Server gathers all property parameters from the target device, and identifies the provisioning type and the UNMAP and TRIM capability. Space reclamation for delivering highly available and scalable storage provisioning service to end users.Thin provisioning logical unit (LUN) identification.Windows Server thin provisioning features serve as interfaces between the thin provisioning-capable storage and the host server. It requires planning for storage deployment and execution on the host and client application. Thin provisioning is an end-to-end storage provisioning solution that offers just-in-time allocations.
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