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DM-Multipathing (DM-MPIO) provides input-output (I/O) fail-over and load-balancing by using multipath I/O within Linux for block devices.〔(【引用サイトリンク】first= Christophe )〕〔(【引用サイトリンク】first= Michael )〕 By utilizing device-mapper, the multipathd daemon provides the host-side logic to use multiple paths of a redundant network to provide continuous availability and higher-bandwidth connectivity between the host server and the block-level device. DM-MPIO handles the rerouting of block I/O to an alternate path in the event of a path failure. DM-MPIO can also balance the I/O load across all of the available paths that are typically utilized in Fibre Channel (FC) and iSCSI SAN environments.〔(【引用サイトリンク】title= Storage Administration Guide, SUSE Linux Enterprise Server 11 SP1 )〕 DM-MPIO is based on the device mapper, which provides the basic framework that maps one block device onto another. == Considerations == When utilizing Linux DM-MPIO in a datacenter that has other operating systems and multipath solutions, key components of path management must be considered. *Load balancing — The workload is distributed across the available hardware components. Goal: Reduce I/O completion time, maximize throughput, and optimize resources *Path failover and recover — Utilizes redundant I/O channels to redirect application reads and writes when one or more paths are no longer available. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DM-Multipathing (DM-MPIO) provides input-output (I/O) fail-over and load-balancing by using multipath I/O within Linux for block devices.(【引用サイトリンク】first= Christophe )(【引用サイトリンク】first= Michael ) By utilizing device-mapper, the multipathd daemon provides the host-side logic to use multiple paths of a redundant network to provide continuous availability and higher-bandwidth connectivity between the host server and the block-level device. DM-MPIO handles the rerouting of block I/O to an alternate path in the event of a path failure. DM-MPIO can also balance the I/O load across all of the available paths that are typically utilized in Fibre Channel (FC) and iSCSI SAN environments.(【引用サイトリンク】title= Storage Administration Guide, SUSE Linux Enterprise Server 11 SP1 )DM-MPIO is based on the device mapper, which provides the basic framework that maps one block device onto another.== Considerations ==When utilizing Linux DM-MPIO in a datacenter that has other operating systems and multipath solutions, key components of path management must be considered.*Load balancing — The workload is distributed across the available hardware components. Goal: Reduce I/O completion time, maximize throughput, and optimize resources*Path failover and recover — Utilizes redundant I/O channels to redirect application reads and writes when one or more paths are no longer available.」の詳細全文を読む スポンサード リンク
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