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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>
46 lines
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46 lines
12 KiB
HTML
<a name="evs_01_0037"></a><a name="evs_01_0037"></a>
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<h1 class="topictitle1">Attaching a Shared Disk</h1>
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<div id="body13189358"><div class="section" id="evs_01_0037__section33496173164047"><h4 class="sectiontitle">Scenarios</h4><p id="evs_01_0037__p14600164918485">Separately created shared EVS disks are data disks. In the disk list, the function of such a disk is displayed as <strong id="evs_01_0037__b2014715610814">Data disk</strong>, and the status is displayed as <strong id="evs_01_0037__b141471561783">Available</strong>. In this case, you need to attach the shared data disk to <span id="evs_01_0037__text85112592088">servers</span> for use.</p>
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</div>
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<div class="section" id="evs_01_0037__section74822565516"><h4 class="sectiontitle">Prerequisites</h4><ul id="evs_01_0037__ul32971435115510"><li id="evs_01_0037__li18298183545518">The shared disk status is <strong id="evs_01_0037__b181531738101219">In-use</strong> or <strong id="evs_01_0037__b8624124010122">Available</strong>.</li></ul>
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</div>
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<div class="section" id="evs_01_0037__section124341536184120"><h4 class="sectiontitle">Constraints</h4><div class="notice" id="evs_01_0037__note6425181162014"><span class="noticetitle"><img src="public_sys-resources/notice_3.0-en-us.png"> </span><div class="noticebody"><p id="evs_01_0037__p14254114202"><span id="evs_01_0037__ph174380122618">If you simply attach a shared disk to multiple <span id="evs_01_0037__evs_faq_0039_text382154512348">server</span>s, files cannot be shared among them. Because there are no mutually agreed data read/write rules among <span id="evs_01_0037__evs_faq_0039_text61093113231">server</span>s, read and write operations from them may interfere with each other, or unpredictable errors may occur.</span> To share files between <span id="evs_01_0037__text44381821083">servers</span>, set up a shared file system or a clustered management system first.</p>
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</div></div>
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<ul id="evs_01_0037__ul3314195354412"><li id="evs_01_0037__li6314125304417">A shared disk can be attached to a maximum of 16 <span id="evs_01_0037__text18175184004110">servers</span>. These <span id="evs_01_0037__text6234359121018">server</span>s and the shared disk must be in the same AZ within a region.</li><li id="evs_01_0037__li399917404445">A shared, <strong id="evs_01_0037__b7601152172120">In-use</strong> disk can be attached to other <span id="evs_01_0037__text1332182051312">server</span>s only when the maximum number of <span id="evs_01_0037__text1120131723418">server</span>s that the disk can be attached to has not been reached.</li><li id="evs_01_0037__li17802167204516">All the <span id="evs_01_0037__text2091725624317">servers</span> attached with a shared disk must run either Windows or Linux.<p id="evs_01_0037__p1959710189136">For example, if you attach a shared disk to multiple Windows <span id="evs_01_0037__text6638115184110">servers</span> and then detach it from these <span id="evs_01_0037__text107021469311">servers</span>, the shared disk cannot be attached to Linux <span id="evs_01_0037__text7430155574111">servers</span> later. This is because Windows and Linux support different file systems and cannot identify the original file system on the disk. Improper operations may damage the original file system.</p>
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</li></ul>
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<ul id="evs_01_0037__ul1565516417459"><li id="evs_01_0037__li1265524124514">A shared disk can only be used as a data disk. It cannot be used as a system disk.</li><li id="evs_01_0037__li35413524595"><span id="evs_01_0037__ph37501425112">Cloud servers created from ISO images are only used for OS installation. They have limited functions and cannot have EVS disks attached.</span></li><li id="evs_01_0037__li58589237329">A shared disk can be attached only when the <span id="evs_01_0037__ph1228512571014"><span id="evs_01_0037__text182859519103">servers</span></span>' statuses are <strong id="evs_01_0037__b16419102751420">Running</strong> or <strong id="evs_01_0037__b105951630121412">Stopped</strong>.</li><li id="evs_01_0037__li13985152101111">A frozen disk cannot be attached.</li></ul>
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</div>
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<div class="section" id="evs_01_0037__section336317164059"><h4 class="sectiontitle">Attaching the Disk on the EVS Console</h4><ol id="evs_01_0037__ol1977955163311"><li id="evs_01_0037__li5884586202528"><span>Log in to the management console.</span></li><li id="evs_01_0037__li2935870315121"><span>Click <span><img id="evs_01_0037__en-us_topic_0021738346_image052111582392" src="en-us_image_0237893718.png"></span> in the upper left corner and select the desired region and project.</span></li><li id="evs_01_0037__li3843952015053"><span>Under <strong id="evs_01_0037__b2040518365150">Storage</strong>, click <strong id="evs_01_0037__b2040533641517">Elastic Volume Service</strong>.</span><p><p id="evs_01_0037__p16002076152423">The disk list page is displayed.</p>
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</p></li><li id="evs_01_0037__li36967479201531"><span>Locate the target disk in the list and click <strong id="evs_01_0037__b1875440674">Attach</strong>.</span><p><p id="evs_01_0037__p3173688892841">The <strong id="evs_01_0037__b84235270692817">Attach Disk</strong> dialog box is displayed.</p>
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<div class="p" id="evs_01_0037__p36165504212021">Shared disks support batch attachment, so you can attach a shared disk to multiple <span id="evs_01_0037__text298934965101636">servers</span>. In the <strong id="evs_01_0037__b79765982">Attach Disk</strong> dialog box, the left area shows the server list. After you select the target <span id="evs_01_0037__text19825377111816">servers</span>, they will be displayed in the right area.<div class="fignone" id="evs_01_0037__fig24573759111041"><span class="figcap"><b>Figure 1 </b>Attach Disk</span><br><span><img id="evs_01_0037__image97308310154" src="en-us_image_0152639916.png"></span></div>
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</div>
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</p></li><li id="evs_01_0037__li5120896311315"><span>Select the target <span id="evs_01_0037__text119701013917">servers</span> you want to attach the shared disk. Ensure that the disk and servers are in the same AZ. After you select <span id="evs_01_0037__text286215918343">the server</span>s, <strong id="evs_01_0037__b16200501122">Data disk</strong> is automatically entered as the disk function for each server.</span><p><p id="evs_01_0037__p15286616814"></p>
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</p></li><li id="evs_01_0037__li2439421982"><span id="evs_01_0037__p16410192715301">Click <span class="uicontrol" id="evs_01_0037__uicontrol1941011279308"><b>OK</b></span> to return to the disk list page.</span><p><p id="evs_01_0037__li2439421982p0">The status of the disk is <strong id="evs_01_0037__b463819278283">Attaching</strong>, indicating that the disk is being attached to the servers. When the disk status changes to <strong id="evs_01_0037__b76181948122813">In-use</strong>, the disk is successfully attached.</p>
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</p></li></ol>
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</div>
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<div class="section" id="evs_01_0037__section9325152920159"><h4 class="sectiontitle">Attaching the Disk on the ECS Console</h4><ol id="evs_01_0037__evs_01_0036_ol1116025416377"><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li3490190117228">Log in to the management console.</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li464234814566">Click <span><img id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_en-us_topic_0014250631_en-us_topic_0014250631_image1733511156361" src="en-us_image_0000001487413362.png"></span> in the upper left corner and select the desired region and project.</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li1514345963117">Under <strong id="evs_01_0037__b1094113517513">Compute</strong>, click <strong id="evs_01_0037__b42841117103415">Elastic Cloud Server</strong>.</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li17143459143113">In the search box above the upper right corner of the <span id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_text570533014396">ECS</span> list, enter the <span id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_text7585637123919">ECS</span> name, IP address, or ID for search.</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li4144155920313">Click the name of the target <span id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_text657784293913">ECS</span>.<p id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_p18144205916319">The page providing details about the <span id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_text1283374663910">ECS</span> is displayed.</p>
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</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li1114425923112">Click the <strong id="evs_01_0037__b99310365718">Disks</strong> tab. Then, click <strong id="evs_01_0037__b1393913312575">Attach Disk</strong>.<p id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_p3144159153115">The <strong id="evs_01_0037__b8415103925211">Attach Disk</strong> page is displayed.</p>
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</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li19144105919315">Select the target disk and specify it as the system disk or a data disk.<ul id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_ul1277513585612"><li id="evs_01_0037__li185804498462">For Xen <span id="evs_01_0037__text177912121094">ECS</span>s, you can specify a specific device name, such as <strong id="evs_01_0037__b1179612291">/dev/sdb</strong>.</li><li id="evs_01_0037__li528583924615">For KVM <span id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_text1092849114017">ECS</span>s, you can specify the disk as the system disk or a data disk but cannot specify a specific device name.</li></ul>
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<div class="note" id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_note27754581465"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_ul167741587612"><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li11774758661">If no disks are available, click <strong id="evs_01_0037__b11915141918548">Create Disk</strong> in the lower part of the list.</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li677418581165">For the restrictions on attaching disks, see FAQ "What Are the Requirements for Attaching an EVS Disk to an ECS?" in the <em id="evs_01_0037__i1982517374344">Elastic Cloud Server User Guide</em>.</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li157435161368">The device names for the local disks and EVS disks attached to a disk-intensive ECS comply with the following rules:<ul id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_ul395595414419"><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li4870195117447">System disk: sda or vda</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li1487011510448">Local disk: the device name following sda or vda in alphabetical order</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li0870115184412">EVS disk: the device name in alphabetical order following those used by local disks</li></ul>
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<p id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_p16110141514451">Example:</p>
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<p id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_p17103141010456">A D1 ECS has two local disks. The device names of the two local disks are sdb and sdc (or vdb and vdc), and the device names of the EVS disks are sdd, sde, ... (or vdd, vde, ...).</p>
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</li></ul>
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</div></div>
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</li><li id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_li378881832719">Click <strong id="evs_01_0037__b61352415512">OK</strong>.<p id="evs_01_0037__evs_01_0036_en-us_topic_0096293655_p27881518102716">After the disk is attached, you can view the information about it on the <strong id="evs_01_0037__b1876516311564">Disks</strong> tab.</p>
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</li></ol>
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</div>
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<div class="section" id="evs_01_0037__section17645185215013"><h4 class="sectiontitle">Follow-Up Operations</h4><p id="evs_01_0037__evs_01_0036_p2977174934812">If you are attaching a new disk, you must then log in to the server and initialize the disk before it can be used. To learn how to initialize disks, see <a href="evs_01_0038.html">Introduction to Data Disk Initialization Scenarios and Partition Styles</a>.</p>
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</div>
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<div class="section" id="evs_01_0037__section15232163084918"><h4 class="sectiontitle">Related Operations</h4><p id="evs_01_0037__evs_01_0036_p477716815711">If your disk cannot be attached to a server, see <a href="evs_faq_0025.html">Why Can't I Attach My Disk to a Server?</a>.</p>
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<p id="evs_01_0037__evs_01_0036_p20623193814810">If the disk you are going to attach contains data, see <a href="evs_01_0073.html">Attaching an Existing Disk</a>.</p>
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<p id="evs_01_0037__evs_01_0036_p65359525915">If the attached data disk is not showing up, see <a href="evs_faq_0022.html">Why Can't I View the Attached Data Disk on the Server?</a>.</p>
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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_0107.html">Attach an EVS Disk</a></div>
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