forked from docs/doc-exports
lizaoxu
001a9c5e70
Reviewed-by: Muller, Martin <martin.muller@t-systems.com> Co-authored-by: lizaoxu <lizaoxu@huawei.com> Co-committed-by: lizaoxu <lizaoxu@huawei.com>
57 lines
4.3 KiB
HTML
57 lines
4.3 KiB
HTML
<a name="evs_01_0102"></a><a name="evs_01_0102"></a>
|
|
|
|
<h1 class="topictitle1">EVS Concepts</h1>
|
|
<div id="body8662426">
|
|
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="evs_01_0102__en-us_topic_0205535205_table464912173224" frame="border" border="1" rules="all"><caption><b>Table 1 </b>EVS concepts</caption><thead align="left"><tr id="evs_01_0102__en-us_topic_0205535205_row1664913171228"><th align="left" class="cellrowborder" valign="top" width="13.459999999999999%" id="mcps1.3.1.2.4.1.1"><p id="evs_01_0102__en-us_topic_0205535205_p126491717202217">Concept</p>
|
|
</th>
|
|
<th align="left" class="cellrowborder" valign="top" width="59.550000000000004%" id="mcps1.3.1.2.4.1.2"><p id="evs_01_0102__en-us_topic_0205535205_p164914173225">Description</p>
|
|
</th>
|
|
<th align="left" class="cellrowborder" valign="top" width="26.99%" id="mcps1.3.1.2.4.1.3"><p id="evs_01_0102__en-us_topic_0205535205_p165770193420">Reference</p>
|
|
</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody><tr id="evs_01_0102__en-us_topic_0205535205_row1650117162216"><td class="cellrowborder" valign="top" width="13.459999999999999%" headers="mcps1.3.1.2.4.1.1 "><p id="evs_01_0102__en-us_topic_0205535205_p1565011715222">IOPS</p>
|
|
</td>
|
|
<td class="cellrowborder" valign="top" width="59.550000000000004%" headers="mcps1.3.1.2.4.1.2 "><p id="evs_01_0102__en-us_topic_0205535205_p3650161782216">Number of read/write operations performed by an EVS disk per second.</p>
|
|
</td>
|
|
<td class="cellrowborder" rowspan="4" valign="top" width="26.99%" headers="mcps1.3.1.2.4.1.3 "><p id="evs_01_0102__en-us_topic_0205535205_p3142818192717"><a href="en-us_topic_0014580744.html">Disk Types and Performance</a></p>
|
|
</td>
|
|
</tr>
|
|
<tr id="evs_01_0102__en-us_topic_0205535205_row2065091712220"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.1 "><p id="evs_01_0102__en-us_topic_0205535205_p18650817152213">Throughput</p>
|
|
</td>
|
|
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.2 "><p id="evs_01_0102__en-us_topic_0205535205_p16650171716227">Amount of data read from and written into an EVS disk per second.</p>
|
|
</td>
|
|
</tr>
|
|
<tr id="evs_01_0102__en-us_topic_0205535205_row1365017177229"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.1 "><p id="evs_01_0102__en-us_topic_0205535205_p865031720229">Read/write I/O latency</p>
|
|
</td>
|
|
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.2 "><p id="evs_01_0102__en-us_topic_0205535205_p265041722212">Minimum interval between two consecutive read/write operations of an EVS disk.</p>
|
|
</td>
|
|
</tr>
|
|
<tr id="evs_01_0102__en-us_topic_0205535205_row065041716220"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.1 "><p id="evs_01_0102__en-us_topic_0205535205_p1565013171224">Burst capability</p>
|
|
</td>
|
|
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.2 "><p id="evs_01_0102__en-us_topic_0205535205_p1165016176223">A small-capacity disk can surpass its official maximum IOPS for a short period of time.</p>
|
|
</td>
|
|
</tr>
|
|
<tr id="evs_01_0102__en-us_topic_0205535205_row16848175162916"><td class="cellrowborder" valign="top" width="13.459999999999999%" headers="mcps1.3.1.2.4.1.1 "><p id="evs_01_0102__en-us_topic_0205535205_p58499502913">VBD</p>
|
|
</td>
|
|
<td class="cellrowborder" valign="top" width="59.550000000000004%" headers="mcps1.3.1.2.4.1.2 "><p id="evs_01_0102__en-us_topic_0205535205_p7849857297">A device type of EVS disks. VBD EVS disks only support basic SCSI read/write commands.</p>
|
|
</td>
|
|
<td class="cellrowborder" rowspan="2" valign="top" width="26.99%" headers="mcps1.3.1.2.4.1.3 "><p id="evs_01_0102__en-us_topic_0205535205_p358110943518"><a href="en-us_topic_0052554220.html">Device Types</a></p>
|
|
</td>
|
|
</tr>
|
|
<tr id="evs_01_0102__en-us_topic_0205535205_row839961052913"><td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.1 "><p id="evs_01_0102__en-us_topic_0205535205_p13400151014293">SCSI</p>
|
|
</td>
|
|
<td class="cellrowborder" valign="top" headers="mcps1.3.1.2.4.1.2 "><p id="evs_01_0102__en-us_topic_0205535205_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>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="evs_01_0101.html">Basic Concepts</a></div>
|
|
</div>
|
|
</div>
|
|
|