摘要:
Provided are a method, system, and program for adding a fourth device to a network including a first, second, and third devices, wherein the first and second devices are directly connected to the third device. The fourth device is directly connected to the third device while the first and second devices remain connected to the third device, and wherein the first and second devices continue to have access to the third device while the fourth device is connected to the third device.
摘要:
Provided is a method, system, and program for processing Input/Output (I/O) requests to a storage network including at least one storage device and at least two adaptors, wherein each adaptor is capable of communicating I/O requests to the at least one storage device. An error is detected in a system including a first adaptor, wherein the first adaptor is capable of communicating on the network after the error is detected. In response to detecting the error, a monitoring state is initiated to monitor I/O requests transmitted through a second adaptor. In response to receiving an I/O request, an I/O delay timer is started that is less than a system timeout period. After the system timeout period the error recovery process in the system including the first adaptor would complete. A reset request is sent to the first adaptor in response to detecting an expiration of one started I/O delay timer.
摘要:
Provided are a method, system, and program for processing Input/Output (I/O) requests to a storage space having a plurality of storage devices. An Input/Output (I/O) request is received directed to a target location in a target storage device in the storage space, wherein the storage space includes at least two adaptors providing access to the storage devices. A determination is made of a plurality of paths to the target storage device, wherein a path comprises one adaptor or one adaptor and at least one intervening storage device. A determination is made of a characteristic of each determined path. One path is selected based on the determined characteristic and the I/O request is transmitted to the adaptor in the selected path.
摘要:
For preventing data loss in storage systems, a detection is made that a storage device in a plurality of storage devices is experiencing a malfunction. The type of malfunction is determined. A SMART rebuilding technique, a normal building technique, a data migration technique, or a user data backup technique is selected to preserve the data in the storage device based on the determined type of the malfunction. The selected technique is performed on the storage device.
摘要:
An apparatus and method to manage redundant non-volatile storage (“NVS”) data backups in a data storage system comprising (n) clusters, wherein each cluster comprises a processor and a cache, and wherein each cache comprises a first NVS portion and a second NVS portion, wherein the method configures, for each value of (i), a primary NVS backup for an (i)th cluster, where that (i)th primary NVS backup comprises a first NVS portion of a cache disposed in an (i+1)th modulo (n) cluster, wherein (i) is greater than or equal to 0 and less than (n). The method further configures, for each value of (i), a secondary NVS backup for an (i)th cluster, where that (i)th secondary NVS backup comprises a second NVS portion of a cache disposed in an (i+2)th modulo (n) cluster.
摘要翻译:一种用于在包括(n)个集群的数据存储系统中管理冗余非易失性存储(“NVS”)数据备份的装置和方法,其中每个集群包括处理器和高速缓存,并且其中每个高速缓存包括第一NVS部分和 其中所述方法针对(i)的每个值配置用于第(i)个群集的主NVS备份,其中(i)所述主NVS备份包括设置在(i)中的高速缓存的第一NVS部分, i + 1)模(n)簇,其中(i)大于或等于0且小于(n)。 该方法还针对(i)的每个值配置用于第(i)个群集的辅助NVS备份,其中(i)次级NVS备份包括以(i + 2) (n)个簇。
摘要:
Provided are a method, system, and article of manufacture for using device status information to takeover control of devices assigned to a node. A first processing unit communicates with a second processing unit. The first processing unit uses a first device accessible to both the first and second processing units and the second processing unit uses a second device accessible to both the first and second processing units. The first processing unit receives status on the second device from the first device indicating whether the second device is available or unavailable. The first processing unit detects a failure of the second processing unit and determines from the received status on the second device whether the first device is available in response to detecting the failure of the second processing unit. The first processing unit configures the second device for use by the first processing unit in response to determining that the received status on the second device indicates that the second device is available and in response to detecting the failure.
摘要:
Provided are a method, system, and article of manufacture for using device status information to takeover control of devices assigned to a node. A first processing unit communicates with a second processing unit. The first processing unit uses a first device accessible to both the first and second processing units and the second processing unit uses a second device accessible to both the first and second processing units. The first processing unit receives status on the second device from the first device indicating whether the second device is available or unavailable. The first processing unit detects a failure of the second processing unit and determines from the received status on the second device whether the first device is available in response to detecting the failure of the second processing unit. The first processing unit configures the second device for use by the first processing unit in response to determining that the received status on the second device indicates that the second device is available and in response to detecting the failure.
摘要:
A method to access a data in a RAID array comprising a plurality of data storage media, wherein information is written to said plurality of data storage media using a RAID configuration, wherein the method receives from a requester a command comprising a data access priority indicator. If a RAID rebuild is in progress, the method determines if the data access priority indicator is set. If the data access priority indicator is set, the method executes a command selected from the group consisting of writing information to the target logical block array range, and returning to the requestor information read from the target logical block array range.
摘要:
An apparatus for parity data management receives a write command and write data from a computing device. The apparatus also builds a parity control structure corresponding to updating a redundant disk array with the write data and stores the parity control structure in a persistent memory buffer of the computing device. The apparatus also updates the redundant disk array with the write data in accordance with a parity control map and restores the RAID controller parity map from the parity control structure as part of a data recovery operation if updating the redundant disk array with the write data is interrupted by a RAID controller failure resulting in a loss of the RAID controller parity map. In certain embodiments, the parity control structure is a RAID controller parity map.
摘要:
An apparatus, system and method of verifying data are provided. Active data are identified among data on a storage device, records the location of the active data, and the integrity of the active data are verified. In one embodiment, data in segments adjacent to the active data segments are also identified and verified for improved data reliability. The data verification may be used to increase data reliability with low system resource usage.