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zhangyue
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Reviewed-by: Miskanin, Jan <jan.miskanin@t-systems.com> Co-authored-by: zhangyue <zhangyue164@huawei.com> Co-committed-by: zhangyue <zhangyue164@huawei.com>
51 lines
3.3 KiB
HTML
51 lines
3.3 KiB
HTML
<a name="evs_01_0102"></a><a name="evs_01_0102"></a>
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<h1 class="topictitle1">EVS Concepts</h1>
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<div id="body1574060481550">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="evs_01_0102__table464912173224" frame="border" border="1" rules="all"><caption><b>Table 1 </b>EVS concepts</caption><thead align="left"><tr id="evs_01_0102__row1664913171228"><th align="left" class="cellrowborder" valign="top" width="20%" id="mcps1.3.1.2.3.1.1"><p id="evs_01_0102__p126491717202217">Concept</p>
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<th align="left" class="cellrowborder" valign="top" width="80%" id="mcps1.3.1.2.3.1.2"><p id="evs_01_0102__p164914173225">Description</p>
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</th>
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<tbody><tr id="evs_01_0102__row1650117162216"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.1.2.3.1.1 "><p id="evs_01_0102__p1565011715222">IOPS</p>
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</td>
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<td class="cellrowborder" valign="top" width="80%" headers="mcps1.3.1.2.3.1.2 "><p id="evs_01_0102__p3650161782216">Number of read/write operations performed by an EVS disk per second</p>
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</td>
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<tr id="evs_01_0102__row2065091712220"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.1.2.3.1.1 "><p id="evs_01_0102__p18650817152213">Throughput</p>
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<td class="cellrowborder" valign="top" width="80%" headers="mcps1.3.1.2.3.1.2 "><p id="evs_01_0102__p16650171716227">Amount of data read from and written into an EVS disk per second</p>
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<tr id="evs_01_0102__row1365017177229"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.1.2.3.1.1 "><p id="evs_01_0102__p865031720229">Read/write I/O latency</p>
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<td class="cellrowborder" valign="top" width="80%" headers="mcps1.3.1.2.3.1.2 "><p id="evs_01_0102__p265041722212">Minimum interval between two consecutive read/write operations of an EVS disk</p>
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<tr id="evs_01_0102__row065041716220"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.1.2.3.1.1 "><p id="evs_01_0102__p1565013171224">Burst capability</p>
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<td class="cellrowborder" valign="top" width="80%" headers="mcps1.3.1.2.3.1.2 "><p id="evs_01_0102__p1165016176223">The burst capability allows the IOPS of a small-capacity disk to reach the disk IOPS burst limit, which can surpass the disk IOPS limit within a certain period of time.</p>
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<tr id="evs_01_0102__row16848175162916"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.1.2.3.1.1 "><p id="evs_01_0102__p58499502913">VBD</p>
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<td class="cellrowborder" valign="top" width="80%" headers="mcps1.3.1.2.3.1.2 "><p id="evs_01_0102__p7849857297">A device type of EVS disks. VBD EVS disks only support basic SCSI read/write commands.</p>
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<tr id="evs_01_0102__row839961052913"><td class="cellrowborder" valign="top" width="20%" headers="mcps1.3.1.2.3.1.1 "><p id="evs_01_0102__p13400151014293">SCSI</p>
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<td class="cellrowborder" valign="top" width="80%" headers="mcps1.3.1.2.3.1.2 "><p id="evs_01_0102__p340015102292">A device type of EVS disks. SCSI EVS disks support transparent SCSI command transmission and allow the server OS to directly access the underlying storage media.</p>
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</tbody>
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</table>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="evs_01_0101.html">Basic Concepts</a></div>
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</div>
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</div>
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