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<a class="bubble" href="/article/blog-e6-96-b0-e5-a2-9e-vultr-storage-vps-e6-8f-90-e4-be-9b-iscsi-e7-b5-a6wordpress-e4-b8-bb-e6-a9-9f-e4-bd-bf-e7-94-a8/">
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<h3><a href="/article/blog-e6-96-b0-e5-a2-9e-vultr-storage-vps-e6-8f-90-e4-be-9b-iscsi-e7-b5-a6wordpress-e4-b8-bb-e6-a9-9f-e4-bd-bf-e7-94-a8/">[BLOG] 新增 Vultr Storage VPS 提供 iscsi 給wordpress 主機使用</a></h3>
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<div class="meta">
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<span class="date moment">2016-03-10</span>
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</div>
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<h2 id="新增-vultr-storage-vps-提供-iscsi-給wordpress-主機使用"><strong>新增 Vultr Storage VPS 提供 iscsi 給wordpress 主機使用</strong></h2>
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<p>前幾天因為DO的WP主機速度不理想，就連拿來當作上PTT的跳板都會頓爹</p>
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<p>所以把主機換到了vultr 的東京機房，光是ping值就從 14x ms 下降到了 4x ms，整個大改善啊！</p>
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<p>而且方案從原本的 10USD 換成了 5USD (1 cpu / 768M/15G) ，裝好FreeBSD拿來跑 WP算是綽綽有餘</p>
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<p>不過因為這台還當作 pydio 主機來用， 15G的空間實在不夠用</p>
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<p>發TICKET詢問客服能不能增加硬碟空間，客服表示只能upgrade plan</p>
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<p>但是再往上一級的10 USD方案，也只有 20G，多了 5 USD 只有多5G空間(好啦 還有流量也增加，問題是我用不到流量啊…)</p>
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<p>算一算，實在不是很划算</p>
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<p>就在這個摸門特，發現了 vultr 有 Storage Instance !</p>
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<p>只要 5USD 就有一台虛擬主機 (1 cpu / 512M/125G SATA HD)</p>
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<p>怎麼算都比upgrade 到 10USD的方案划算，而且價格一樣！</p>
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<p>二話不說，馬上申請一台，一樣跑FreeBSD 10.2，打算拿來當作儲存空間用</p>
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<p>至於要用 sshfs / curlftpfs / nfs /iscsi 則是還沒決定，且戰且走</p>
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<p> </p>
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<hr />
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<p> </p>
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<p></p>
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<p>系統開起來之後，先到管理介面替兩台主機都新增一個 private IP，然後兩台主機都需要重新開機</p>
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<p><a href="http://wp.cowbay.org/wp-content/uploads/2016/03/firefox_2016-03-10_11-36-04.png"><img src="http://wp.cowbay.org/wp-content/uploads/2016/03/firefox_2016-03-10_11-36-04-1024x722.png" alt="firefox_2016-03-10_11-36-04" /></a></p>
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<p> </p>
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<p>重新開機後，必須要手動到系統內去新增虛擬 IP</p>
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<p>就分別ssh 到這兩台機器，然後用bsdconfig 去設定 Network Management</p>
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<p>(By the way , Storage Instance 的效能真的差滿多的，兩台一起設定，就能比較出來)</p>
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<p>設定完之後，兩台ping 一下，應該要能通
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> root@wpstorage:/etc # ping 10.99.0.11
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>
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> PING 10.99.0.11 (10.99.0.11): 56 data bytes
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>
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> 64 bytes from 10.99.0.11: icmp_seq=0 ttl=64 time=0.469 ms
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>
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> 64 bytes from 10.99.0.11: icmp_seq=1 ttl=64 time=0.715 ms
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>
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> 64 bytes from 10.99.0.11: icmp_seq=2 ttl=64 time=0.511 ms
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>
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> 64 bytes from 10.99.0.11: icmp_seq=3 ttl=64 time=0.755 ms
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>
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> ^C
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>
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> — 10.99.0.11 ping statistics —
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>
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> 4 packets transmitted, 4 packets received, 0.0% packet loss
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>
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> round-trip min/avg/max/stddev = 0.<sup>469</sup>⁄<sub>0</sub>.<sup>612</sup>⁄<sub>0</sub>.<sup>755</sup>⁄<sub>0</sub>.124 ms
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接下來就來測試怎麼把Storage Instance的空間掛來 WP 使用</p>
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<p>先測試比較簡單的 sshfs</p>
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<p>在WP主機上，先載入fuse.ko
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> kldload fuse.ko
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然後 sshfs root@10.99.0.11 /mnt</p>
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<p>輸入密碼之後，就把Storage主機的硬碟掛載 /mnt 底下了</p>
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<p>測試一下速度</p>
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<p>root@wp:/iscsi # dd if=/dev/zero of=testfile bs=1k count=100000
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100000+0 records in
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100000+0 records out
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102400000 bytes transferred in 17.661407 secs (1056241 bytes/sec)</p>
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<p>WHAT !!!!!?????</p>
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<p>這效能是怎麼回事？？？糟糕到一個不行啊！！！換算起來才 1mb 不到！？</p>
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<p>有沒有那麼糟糕啊？？看來用 sshfs 行不通！</p>
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<p>馬上 umount</p>
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<p>既然用fuse 去掛載進來的效能這麼糟糕，那 curlftpfs 應該也不用測試了，跳過，改用 iscsi 好了</p>
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<p>翻了一下 google ，好像 FreeBSD 10.2的 iscsi 改用 ctl 來處理</p>
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<p>於是參考這篇文章 <a href="http://jxtm.jzu.cn/?p=3238">用FreeBSD10搭建基于ZFS的iSCSI服务 </a>跳過 ZFS 的部分來建立iscsi target</p>
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<hr />
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<p> </p>
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<p>以下這段在 storage 主機操作</p>
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<p>首先修改 /etc/rc.conf 加入
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> <pre class="brush:java;">ctld_enable=“YES”
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>
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>
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> </pre>
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</p>
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<p>接著編輯 ctld 的設定檔</p>
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<p>vim /etc/ctld.conf
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> <pre class="brush:java;">portal-group san {
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>
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> discovery-auth-group no-authentication
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>
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> listen 10.99.0.10 #改成自己的 IP
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>
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> }
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>
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>
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> target iqn.2014-05.com.example:target0 { #target name 可改可不改，就先保留，不要動吧
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>
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> auth-group no-authentication
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>
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> portal-group san
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>
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> lun 0 {
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>
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> path /mnt/iscsifile #指定 iscsi file 的位置
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>
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> blocksize 4096
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>
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> size 100G #指定大小
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>
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> }
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>
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> }</pre>
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建立一個 target(iqn.2014-05.com.example:target0 )、一個 portal-group (san) 不需要認證 (反正這個LAN只有我自己的主機能存取)</p>
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<p>再來修改ctld.conf 的權限
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> <pre class="brush:java;">chmod 600 /etc/ctl.conf</pre>
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啟動 ctld 服務
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> <pre class="brush:java;">service ctld start</pre>
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檢查 /var/log/messages 看看有沒有啥錯誤，正常來說應該不會有啥問題。</p>
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<hr />
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<p> </p>
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<p>iscsi target 到這邊設定OK，接著來去WP主機建立 iscsi initiator</p>
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<p>先載入 iscsi_initiator.ko
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> kldload -v iscsi_initiator.ko
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如果以後開機要自動載入的話</p>
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<p>vim /boot/loader.conf
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新增底下這一行
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> iscsi_initiator_load=”YES”
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存檔後離開，修改檔案權限
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> chmod 755 /boot/loader.conf
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再來，搜尋一下 iscsi target
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> iscontrol -v -d targetaddress=10.99.0.10 initiatorname=iqn
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>
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>
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> #targetaddress 要改成 storage主機的 IP
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如果一切沒問題，應該會出現這樣的訊息
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> adding ‘targetaddress=10.99.0.10’
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>
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> I-: cmd=0x3 len=265
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>
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> SessionType=Discovery
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>
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> InitiatorName=nxl
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>
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> MaxBurstLength=131072
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>
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> HeaderDigest=None,CRC32C
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>
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> DataDigest=None,CRC32C
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>
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> MaxRecvDataSegmentLength=65536
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>
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> ErrorRecoveryLevel=0
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>
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> DefaultTime2Wait=0
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>
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> DefaultTime2Retain=0
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>
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> DataPDUInOrder=Yes
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>
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> DataSequenceInOrder=Yes
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>
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> MaxOutstandingR2T=1
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>
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> T-: cmd=0x23 len=212
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>
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> MaxBurstLength=131072
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>
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> HeaderDigest=None
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>
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> DataDigest=None
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>
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> MaxRecvDataSegmentLength=131072
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>
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> ErrorRecoveryLevel=0
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>
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> DefaultTime2Wait=0
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>
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> DefaultTime2Retain=0
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>
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> DataPDUInOrder=Yes
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>
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> DataSequenceInOrder=Yes
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>
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> MaxOutstandingR2T=1
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>
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> I-: cmd=0x4 len=16
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>
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> SendTargets=All
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>
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> T-: cmd=0x24 len=75
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>
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> TargetName=iqn.2014-05.com.example:target0
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>
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> TargetAddress=10.99.0.10:3260,2
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>
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> TargetName=iqn.2014-05.com.example:target0
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>
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> TargetAddress=10.99.0.10:3260,2
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>
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> I-: cmd=0x6 len=0
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>
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> T-: cmd=0x26 len=0
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雖然很多看不懂，但是看樣子似乎是有找到，把 targetName / TargetAddress 抄下來</p>
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<p>接著設定 iscsi initiator的設定檔</p>
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<p>vim /etc/iscsi.conf
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> wpiscsi {
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>
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> authmethod = CHAP
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>
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|
> chapIName = YOUR-ISCSI-USERNAME #認證名稱 沒用到
|
|
|
>
|
|
|
> chapSecret = YOUR-ISCSI-PASSWORD #認證密碼 沒用到
|
|
|
>
|
|
|
> initiatorname = iqn
|
|
|
>
|
|
|
> TargetName = iqn.2014-05.com.example:target0 #改成剛剛搜尋回傳的結果
|
|
|
>
|
|
|
> TargetAddress = 10.99.0.10:3260,2 # 改成剛剛搜尋回傳的結果
|
|
|
>
|
|
|
> }
|
|
|
存檔離開、設定權限
|
|
|
> chmod 755 /etc/iscsi.conf
|
|
|
測試連線
|
|
|
> iscontrol -c /etc/iscsi.conf -n wpiscsi
|
|
|
正常的話，會出現類似這樣的訊息
|
|
|
> <span style="font-family: Consolas,Monaco,Menlo,Courier,Verdana,sans-serif;"><span style="color: #111111;">iscontrol[8146]: running</span></span>
|
|
|
dmesg 看一下，最底下應該會出現找到新磁碟的訊息
|
|
|
> da0 at iscsi0 bus 0 scbus2 target 0 lun 0
|
|
|
>
|
|
|
> da0: <FREEBSD CTLDISK 0001> Fixed Direct Access SPC-4 SCSI device
|
|
|
>
|
|
|
> da0: Serial Number MYSERIAL 0
|
|
|
>
|
|
|
> da0: 102400MB (26214400 4096 byte sectors: 255H 63S/T 1631C)
|
|
|
BINGO ！抓到了！</p>
|
|
|
|
|
|
<p>再來就是去bsdconfig 分割，然後掛載
|
|
|
> root@wp:/iscsi # mount
|
|
|
>
|
|
|
> /dev/vtbd0p2 on / (ufs, local, soft-updates)
|
|
|
>
|
|
|
> devfs on /dev (devfs, local, multilabel)
|
|
|
>
|
|
|
> /dev/da0s1a on /iscsi (ufs, local, journaled soft-updates)
|
|
|
>
|
|
|
> root@wp:/iscsi #
|
|
|
馬上來測試一下速度看看！可以發現磁碟寫入速度有大幅度的增加！！
|
|
|
> root@wp:/iscsi # dd if=/dev/zero of=testfile bs=1k count=1000
|
|
|
>
|
|
|
> 1000+0 records in
|
|
|
>
|
|
|
> 1000+0 records out
|
|
|
>
|
|
|
> 1024000 bytes transferred in 0.005329 secs (192151364 bytes/sec)
|
|
|
>
|
|
|
> root@wp:/iscsi # dd if=/dev/zero of=testfile bs=1k count=10000
|
|
|
>
|
|
|
> 10000+0 records in
|
|
|
>
|
|
|
> 10000+0 records out
|
|
|
>
|
|
|
> 10240000 bytes transferred in 0.196187 secs (52195094 bytes/sec)
|
|
|
>
|
|
|
> root@wp:/iscsi # dd if=/dev/zero of=testfile bs=1k count=100000
|
|
|
>
|
|
|
> 100000+0 records in
|
|
|
>
|
|
|
> 100000+0 records out
|
|
|
>
|
|
|
> 102400000 bytes transferred in 17.661407 secs (5797953 bytes/sec)
|
|
|
>
|
|
|
> root@wp:/iscsi # dd if=/dev/zero of=testfile bs=1k count=100000
|
|
|
>
|
|
|
> 100000+0 records in
|
|
|
>
|
|
|
> 100000+0 records out
|
|
|
>
|
|
|
> 102400000 bytes transferred in 9.815858 secs (10432099 bytes/sec)
|
|
|
</p>
|
|
|
|
|
|
<p>接著編輯 /root/iscsi.sh ，重開機就去執行這個指令，把iscsi 掛進來
|
|
|
> #!/bin/sh
|
|
|
>
|
|
|
> iscontrol -c /etc/iscsi.conf -n wpiscsi
|
|
|
>
|
|
|
> sleep 60
|
|
|
>
|
|
|
> mount /dev/da0s1d /iscsi
|
|
|
chmod u+rwx /root/iscsi.sh</p>
|
|
|
|
|
|
<p>大功告成！</p>
|
|
|
|
|
|
<p>日後重開機的話，手動執行 iscsi.sh ，就可以了！</p>
|
|
|
|
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|
<p> </p>
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