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<h3><a href="/post/10g-lab-using-proxmox-and-mellanox/">[筆記] 用 proxmox & Mellanox SFP 網卡土炮 10G LAB </a></h3>
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<div class="meta">
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<span class="date moment">2018-11-30</span>
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</span>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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</div>
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<p>想做一個 10G 的 LAB 環境出來已經很久了。</p>
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<p>只是礙於10G RJ45的卡太貴了，然後光纖的種類又太複雜</p>
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<p>如果直接在淘寶購買，很怕會買錯(什麼LC/FC LC/LC 多模單模 單芯雙芯 SFP/SFP+ 又是什麼光模塊的一大堆規格)</p>
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<p>所以一直沒有付諸行動。</p>
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<p>硬體的工作很久沒碰了，剛好在蝦皮看到有個賣家在賣 mellanox 的X2網卡，以在台灣的價格來說，算很便宜的 (550)</p>
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<p>聊了一下，跟他請教了關於線材、光纖模塊的問題，回答也都很快很到位</p>
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<p>就直接下訂了兩張網卡、兩個光纖模塊、一條LC/LC 光纖線</p>
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<p>就是到貨有點久，等了兩個禮拜左右，一直到昨天東西才寄到</p>
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<p>今天就花了點時間測試一下</p>
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<p></p>
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<p>先上個圖！</p>
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<p><img src="https://i.imgur.com/34MNFkW.png" alt="10G LAB" /></p>
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<p>簡單說，就是有兩台機器，分別安裝 proxmox (一台是新裝的，另一台是本來就在線上的LAB用機器)以及光纖網卡</p>
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<p>Mellanox 這張 X2 的卡， proxmox 5.1 / 5.2 可以直接抓到，所以不必另外安裝驅動程式</p>
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<p>硬體安裝很順利，不過軟體的設定就碰到點麻煩了，所以才想說作個筆記..</p>
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<h3 id="strong-font-color-red-必須作-vmbridge-才能指定這個網卡給vm用-font-strong"><strong><font color="red">必須作 vmbridge 才能指定這個網卡給VM用 </font></strong></h3>
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<p>安裝好網卡，開機，透過proxmox的WEB界面設定好網卡的資料後，原本以為可以直接使用了</p>
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<p>但是proxmox 會提示需要重新開機才能變更設定</p>
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<p>可是重新開機後，我兩台怎麼都ping不到對方</p>
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<p>在這之前，我已經用兩台 ubuntu 18.04 client 測試過了，只要設定好IP就可以直接通</p>
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<p>所以在這邊碰到這個問題，我滿訝異的</p>
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<p>可是看網卡的燈號，明明就有亮起來，應該是正常的呀</p>
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<p>原來，在proxmox 中，新增了網卡，並不是直接就可以拿來用</p>
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<p>要先設定好 bridge ，然後才能起新的VM、指定新設定的 vmbridge 給這個新起的機器使用</p>
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<h3 id="strong-font-color-red-disk-cache-type-要改-font-strong"><strong><font color="red">Disk Cache type 要改</font></strong></h3>
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<p>設定了新的 vmbridge 之後，就可以在新VM的設定畫面中，指定網卡走這個界面出去</p>
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<p>可是這樣做出來的VM ，一直無法開機</p>
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<p>錯誤訊息如下</p>
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<pre><code>kvm: -drive file=/zp/images/100/vm-100-disk-1.qcow2,if=none,id=drive-virtio0,format=qcow2,cache=none,aio=native,detect-zeroes=on: file system may not support O_DIRECT
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kvm: -drive file=/zp/images/100/vm-100-disk-1.qcow2,if=none,id=drive-virtio0,format=qcow2,cache=none,aio=native,detect-zeroes=on: Could not open '/zp/images/100/vm-100-disk-1.qcow2': Invalid argument
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TASK ERROR: start failed: command '/usr/bin/kvm -id 100 -name 123123 -chardev 'socket,id=qmp,path=/var/run/qemu-server/100.qmp,server,nowait' -mon 'chardev=qmp,mode=control' -pidfile /var/run/qemu-server/100.pid -daemonize -smbios 'type=1,uuid=da27a9ea-fd55-4542-b2a7-8d5b09bf7611' -smp '2,sockets=1,cores=2,maxcpus=2' -nodefaults -boot 'menu=on,strict=on,reboot-timeout=1000,splash=/usr/share/qemu-server/bootsplash.jpg' -vga std -vnc unix:/var/run/qemu-server/100.vnc,x509,password -cpu kvm64,+lahf_lm,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,enforce -m 2048 -device 'pci-bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f' -device 'pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e' -device 'piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2' -device 'usb-tablet,id=tablet,bus=uhci.0,port=1' -device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3' -iscsi 'initiator-name=iqn.1993-08.org.debian:01:b972d1ad783' -drive 'file=/zp/template/iso/ubuntu-18.04.1-live-server-amd64.iso,if=none,id=drive-ide2,media=cdrom,aio=threads' -device 'ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=200' -drive 'file=/zp/images/100/vm-100-disk-1.qcow2,if=none,id=drive-virtio0,format=qcow2,cache=none,aio=native,detect-zeroes=on' -device 'virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100' -netdev 'type=tap,id=net0,ifname=tap100i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' -device 'virtio-net-pci,mac=A2:EA:45:EE:17:25,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300'' failed: exit code 1
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</code></pre>
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<p>當然先去拜google，果然就看到了提示，需要把 磁碟的 Cache 從預設的 Default(No Cache) 改成 write through</p>
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<p><img src="https://i.imgur.com/cmClmGd.png" alt="proxmox dish cache mode" /></p>
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<p>為什麼？我也不知道..不知道是不是因為我把磁碟種類選成用 Virtio Block 的關係</p>
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<p>總之呢，改完之後就可以了 …</p>
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<h3 id="strong-font-color-red-必須手動設定路由-font-strong"><strong><font color="red">必須手動設定路由</font></strong></h3>
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<h4 id="update">Update</h4>
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<pre><code>這邊可能是我有誤解，應該不需要先在pve 本機設定 10G網卡的 IP
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直接進web console 去設定 vmbr1 就好了
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</code></pre>
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<p>設定好新的VM，開機、設定IP、重開機之後，會發現還是ping 不到另一台機器..(翻桌！)</p>
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<p>只好又去拜google ，就看到了底下這篇</p>
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<p><a href="https://forum.proxmox.com/threads/how-to-add-second-nic.40905/">https://forum.proxmox.com/threads/how-to-add-second-nic.40905/</a></p>
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<p>大概點出了方向，必須要手動增加路由(感覺有點蠢)</p>
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<p>像我的光纖網卡走的是 192.168.50.0/24 ，就要去把原有的192.168.50.0/24的路由給砍掉，然後再新增(是不是很蠢？)</p>
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<pre><code>root@ssd:/etc/network# ip route del 192.168.50.0/24
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root@ssd:/etc/network# ip route add 192.168.50.0/24 dev vmbr1
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root@ssd:/etc/network# ip route
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default via 192.168.11.253 dev vmbr0 onlink
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192.168.11.0/24 dev vmbr0 proto kernel scope link src 192.168.11.215
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192.168.50.0/24 dev vmbr1 scope link
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root@ssd:/etc/network#
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</code></pre>
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<p>OK ping 一下對面看能不能過</p>
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<pre><code>root@ssd:/etc/network# ping 192.168.50.10
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PING 192.168.50.10 (192.168.50.10) 56(84) bytes of data.
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64 bytes from 192.168.50.10: icmp_seq=1 ttl=64 time=0.083 ms
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64 bytes from 192.168.50.10: icmp_seq=2 ttl=64 time=0.067 ms
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64 bytes from 192.168.50.10: icmp_seq=3 ttl=64 time=0.080 ms
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64 bytes from 192.168.50.10: icmp_seq=4 ttl=64 time=0.126 ms
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^C
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--- 192.168.50.10 ping statistics ---
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</code></pre>
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<p>GOOD ！很好！通了一邊，另外一邊就照辦，兩邊都通了，就可以開始來測試速度了</p>
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<p>p.s 這個路由不知道需不需要每次都手動增加，或者是有哪個config可以在開機時載入</p>
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<p>沒記錯的話，應該是在 /etc/network/if-up.d/ 新增一個 route 檔案</p>
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<p>不過這部份我不是很確定就是了</p>
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<p>所以自己寫了一個 script 來用..</p>
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<h3 id="strong-iperf-測試速度-strong"><strong>iperf 測試速度</strong></h3>
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<p>在linux 上，我習慣用 iperf 來測試兩台主機的連接速度</p>
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<p>兩邊都用 apt install iperf 裝好套件</p>
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<p>然後找一台作為 server ，執行</p>
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<pre><code>iperf -s
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</code></pre>
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<p>然後到另一台，去執行</p>
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<pre><code>2018-11-30 15:36:58 [minion@ubuntu ~]$ iperf -d -t 600 -P 10 -c 192.168.50.200
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WARNING: option -d is not valid for server mode
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------------------------------------------------------------
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Client connecting to 192.168.50.200, TCP port 5001
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TCP window size: 85.0 KByte (default)
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------------------------------------------------------------
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[ 3] local 192.168.50.199 port 40980 connected with 192.168.50.200 port 5001
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[ ID] Interval Transfer Bandwidth
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[ 3] 0.0-600.0 sec 641 GBytes 9.18 Gbits/sec
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</code></pre>
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<p>哈哈哈，有目有！測試速度來到了 9.18 Gbits 啊！ 就是一個爽啊！</p>
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<p>記得那個 server IP 是你 VM 裡面設定的 IP，不是 proxmox 上面的</p>
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<p>同場加映走 1Gb 網路的測試結果</p>
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<pre><code>2018-11-30 16:39:37 [minion@ubuntu ~]$ iperf -d -t 600 -P 10 -c 192.168.11.171
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WARNING: option -d is not valid for server mode
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------------------------------------------------------------
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Client connecting to 192.168.11.171, TCP port 5001
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TCP window size: 85.0 KByte (default)
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------------------------------------------------------------
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[ 3] local 192.168.11.55 port 38582 connected with 192.168.11.171 port 5001
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[ ID] Interval Transfer Bandwidth
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[ 3] 0.0-600.0 sec 65.8 GBytes 941 Mbits/sec
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</code></pre>
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<p>192.168.11.171 跟 192.168.50.200 是同一台機器，只是一個是10G網卡，一個是onboard的 1Gb 網卡</p>
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<p>速度果然是提高了十倍呀，果然就是一個爽啊！！</p>
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<h3 id="strong-實際開vm來測試看看-strong"><strong>實際開VM來測試看看</strong></h3>
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<p><del>上面的測試，是兩台PVE HOST之間的連線測試</del></p>
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<p>接下來，要實際測試在PVE中，建立新的VM，一台安裝FreeNAS 作為storage，另一台則是一般的client</p>
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<p>步驟簡單來說，就是在ssd 這台PVE 建立一個新的VM，然後安裝FREENAS，並且提供NFS/iscsi 給另一台PVE Host作為storage來源</p>
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<p>新增storage選NFS，填入必要資訊後，在這台主機上，建立一個新的VM，磁碟選擇剛剛連接的NFS</p>
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<h5 id="strong-要特別注意-freenas的nfs-share的參數要改-strong"><strong>要特別注意，freenas的NFS Share的參數要改</strong></h5>
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<p>在 mapuser/mapgroup這邊要改成 root/wheel 不然會有無法寫入的問題</p>
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<p><img src="https://i.imgur.com/Yn7qYdK.png" alt="FREENAS NFS Sharing" /></p>
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<p>安裝完之後，實際跑一下 dd 看看速度多少</p>
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<pre><code>Last login: Mon Dec 3 03:10:54 2018
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2018-12-03 03:15:03 [administrator@ubuntu ~]$ dd if=/dev/zero of=testfile bs=10240 count=1000000
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1000000+0 records in
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|
1000000+0 records out
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10240000000 bytes (10 GB, 9.5 GiB) copied, 9.63458 s, 1.1 GB/s
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</code></pre>
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<pre><code>2018-12-03 03:17:28 [administrator@ubuntu ~]$ dd if=/dev/zero of=testfile bs=20480 count=1000000
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1000000+0 records in
|
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|
1000000+0 records out
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20480000000 bytes (20 GB, 19 GiB) copied, 16.0786 s, 1.3 GB/s
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</code></pre>
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<pre><code>2018-12-03 03:17:50 [administrator@ubuntu ~]$ dd if=/dev/zero of=testfile bs=4096 count=1000000
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1000000+0 records in
|
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|
1000000+0 records out
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|
4096000000 bytes (4.1 GB, 3.8 GiB) copied, 4.80629 s, 852 MB/s
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2018-12-03 03:25:23 [administrator@ubuntu ~]$
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</code></pre>
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<p>可以看到不但大檔案速度都很快，就連小檔案(4096)居然也有852MB</p>
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<p>我底層也不過就是四顆 SATA3 sandisk 240G SSD 而已啊</p>
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<p>如果都換成PCI-E SSD ，嘿嘿…(流口水</p>
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<hr />
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<p>不過呢，這個也只是自己建的LAB玩玩看而已</p>
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<p>真的要放到 production 環境去，我也還沒啥把握 (畢竟都是中古、二手、退役的產品拼湊起來的)</p>
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<p>而且沒有10G Switch ，所以只能點對點連接</p>
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<p>說不定等到對岸的 10G Switch 開始大降價 (我覺得 8 port SFP+ / NTD $2000 左右我應該就會出手了)</p>
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<p>再來把10G 的環境弄完整一點！</p>
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