diff --git a/sources/tech/20201105 How to Scan-Detect New LUNs and SCSI Disks on Linux.md b/sources/tech/20201105 How to Scan-Detect New LUNs and SCSI Disks on Linux.md deleted file mode 100644 index bc63527249..0000000000 --- a/sources/tech/20201105 How to Scan-Detect New LUNs and SCSI Disks on Linux.md +++ /dev/null @@ -1,163 +0,0 @@ -[#]: collector: (lujun9972) -[#]: translator: (geekpi) -[#]: reviewer: ( ) -[#]: publisher: ( ) -[#]: url: ( ) -[#]: subject: (How to Scan/Detect New LUNs and SCSI Disks on Linux) -[#]: via: (https://www.2daygeek.com/scan-detect-luns-scsi-disks-on-redhat-centos-oracle-linux/) -[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) - -How to Scan/Detect New LUNs and SCSI Disks on Linux -====== - -When the Linux system has connected to the SAN (Storage Area Network) you need to rescan the iSCSI service to discover new LUNs. - -To do so, you must provide the WWN number of the Linux host and required LUN size to the storage team. - -The following article will help you [**find the WWN number of a Linux host**][1]. - -Once the storage team has mapped the LUNs with the given Linux host, they will provide you with the new LUN details. - -LUN in storage terms is referred to as serial-hex of LUN. - -You need to scan the SCSI host to find new LUNs assigned by the storage team. - -This can be done in two ways, scan each scsi host device or run the “rescan-scsi-bus.sh” script to detect new disks. - -After scanning they can be found under the “/dev/disk/by-id” directory. - -``` -# ll /dev/disk/by-id - -total 0 -lrwxrwxrwx 1 root root 10 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684b -> ../../sdah -lrwxrwxrwx 1 root root 9 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684c -> ../../sdw -. -. -lrwxrwxrwx 1 root root 10 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684d -> ../../sdjk -lrwxrwxrwx 1 root root 10 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684e -> ../../sdaa -lrwxrwxrwx 1 root root 9 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684f -> ../../sdh -``` - -Also, you can find them using the Multipath command if you already have them configured with Multipath. - -Multipath is mostly configured into the Oracle database server for better performance. - -``` -# multipath -ll - -60a98000486e542d4f5a2f47694d684b dm-37 NETAPP,LUN C-Mode -size=512G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw -|-+- policy='round-robin 0' prio=50 status=active -| |- 1:0:4:18 sdoe 128:416 active ready running -| |- 0:0:4:18 sdpq 131:256 active ready running -| |- 0:0:5:18 sdsr 135:496 active ready running -| `- 1:0:5:18 sdsq 135:480 active ready running -`-+- policy='round-robin 0' prio=10 status=enabled - |- 1:0:1:18 sdfw 131:32 active ready running - |- 1:0:0:18 sdci 69:96 active ready running - |- 0:0:1:18 sdbz 68:208 active ready running - |- 0:0:0:18 sds 65:32 active ready running - |- 1:0:3:18 sdmd 69:336 active ready running - |- 1:0:2:18 sdjj 8:464 active ready running - |- 0:0:3:34 sdjt 65:368 active ready running - `- 0:0:2:34 sdgi 131:224 active ready running -``` - -This procedure works on Red Hat 6.x, 7.x and 8.x (RHEL – Red Hat Enterprise Linux) based systems such as CentOS and Oracle Linux. - -### Method-1: How to Scan New LUNs and SCSI Disks on Linux Using the “/sys” Class File - -The sysfs filesystem is a pseudo-filesystem which provides an interface to kernel data structures. - -The files under sysfs provide information about devices, kernel modules, filesystems, and other kernel components. - -The sysfs filesystem is commonly mounted at “/sys”. Typically, it is mounted automatically by the system. - -You can use the echo command to scan each scsi host device as shown below. - -``` -# echo "- - -" > /sys/class/scsi_host/host[n]/scan -``` - -When you run the above command that rescan everything, the three dash (“- – -“) refers the wildcard option. These values would be as follow. - -``` -# echo "c t l" > /sys/class/scsi_host/host[n]/scan -``` - -where - - * **c –** Channel on the HBA - * **t –** SCSI target ID - * **l –** LUN ID - * **n –** HBA number - - - -Run the below command to find all the host bus number on your system. - -``` -# ls /sys/class/scsi_host -host0 host1 host2 -``` - -Once you get the host bus number, run the following command to discover new disks. - -``` -# echo "- - -" > /sys/class/scsi_host/host0/scan -# echo "- - -" > /sys/class/scsi_host/host1/scan -# echo "- - -" > /sys/class/scsi_host/host2/scan -``` - -Also, it can be scanned using “for loop” with a single command. - -``` -# for host in ls /sys/class/scsi_host/;do echo "- - -" >/sys/class/scsi_host/${host}/scan; done -``` - -You can check them using the **[ls command][2]** as mentioned at the beginning of the article. - -``` -# ls /dev/disk/by-id | grep -i "serial-hex of LUN" -``` - -### Method-2: How to Scan New LUNs and SCSI Disks on Linux Using the rescan-scsi-bus.sh Script - -Make sure you have already installed the “sg3_utils” package to use this script. Otherwise, run the following command to install it. - -For **RHEL/CentOS 6/7** systems, use the **[yum command][3]** to install sg3_utils. - -``` -# yum install -y sg3_utils -``` - -For **RHEL/CentOS 8** and Fedora systems, use the **[dnf command][4]** to install sg3_utils. - -``` -# dnf install -y sg3_utils -``` - -Now you can rescan the LUNs using the rescan-scsi-bus.sh script. - -``` -# ./rescan-scsi-bus.sh -``` - --------------------------------------------------------------------------------- - -via: https://www.2daygeek.com/scan-detect-luns-scsi-disks-on-redhat-centos-oracle-linux/ - -作者：[Magesh Maruthamuthu][a] -选题：[lujun9972][b] -译者：[译者ID](https://github.com/译者ID) -校对：[校对者ID](https://github.com/校对者ID) - -本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 - -[a]: https://www.2daygeek.com/author/magesh/ -[b]: https://github.com/lujun9972 -[1]: https://www.2daygeek.com/how-to-find-wwn-wwnn-wwpn-number-of-hba-card-in-linux/ -[2]: https://www.2daygeek.com/linux-unix-ls-command-display-directory-contents/ -[3]: https://www.2daygeek.com/linux-yum-command-examples-manage-packages-rhel-centos-systems/ -[4]: https://www.2daygeek.com/linux-dnf-command-examples-manage-packages-fedora-centos-rhel-systems/ diff --git a/translated/tech/20201105 How to Scan-Detect New LUNs and SCSI Disks on Linux.md b/translated/tech/20201105 How to Scan-Detect New LUNs and SCSI Disks on Linux.md new file mode 100644 index 0000000000..9fc298c259 --- /dev/null +++ b/translated/tech/20201105 How to Scan-Detect New LUNs and SCSI Disks on Linux.md @@ -0,0 +1,163 @@ +[#]: collector: (lujun9972) +[#]: translator: (geekpi) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How to Scan/Detect New LUNs and SCSI Disks on Linux) +[#]: via: (https://www.2daygeek.com/scan-detect-luns-scsi-disks-on-redhat-centos-oracle-linux/) +[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) + +如何在 Linux 上扫描/检测新的 LUN 和 SCSI 磁盘？ +====== + +当 Linux 系统连接到 SAN（存储区域网络）后，你需要重新扫描 iSCSI 服务以发现新的 LUN。 + +要做到这一点，你必须向存储团队提供 Linux 主机的 WWN 号和所需的 LUN 大小。 + +下文将帮助你[**查找 Linux 主机的 WWN 号**][1]。 + +当存储团队将 LUN 与给定的 Linux 主机进行了映射，他们将为你提供新的 LUN 详细信息。 + +LUN 在存储术语中被称为 LUN 的串行十六进制。 + +你需要扫描 SCSI 主机来寻找存储团队分配的新 LUN。 + +这可以通过两种方式进行，扫描每个 scsi 主机设备或运行 “rescan-scsi-bus.sh” 脚本来检测新磁盘。 + +扫描后可以在 “/dev/disk/by-id” 目录下找到它们。 + +``` +# ll /dev/disk/by-id + +total 0 +lrwxrwxrwx 1 root root 10 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684b -> ../../sdah +lrwxrwxrwx 1 root root 9 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684c -> ../../sdw +. +. +lrwxrwxrwx 1 root root 10 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684d -> ../../sdjk +lrwxrwxrwx 1 root root 10 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684e -> ../../sdaa +lrwxrwxrwx 1 root root 9 Jul 9 17:52 scsi-60a98000486e542d4f5a2f47694d684f -> ../../sdh +``` + +另外，如果你已经用 Multipath 配置了它们，那么可以用 Multipath 命令找到。 + +Multipath 主要是配置到 Oracle 数据库服务器中，以提高性能。 + +``` +# multipath -ll + +60a98000486e542d4f5a2f47694d684b dm-37 NETAPP,LUN C-Mode +size=512G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw +|-+- policy='round-robin 0' prio=50 status=active +| |- 1:0:4:18 sdoe 128:416 active ready running +| |- 0:0:4:18 sdpq 131:256 active ready running +| |- 0:0:5:18 sdsr 135:496 active ready running +| `- 1:0:5:18 sdsq 135:480 active ready running +`-+- policy='round-robin 0' prio=10 status=enabled +|- 1:0:1:18 sdfw 131:32 active ready running +|- 1:0:0:18 sdci 69:96 active ready running +|- 0:0:1:18 sdbz 68:208 active ready running +|- 0:0:0:18 sds 65:32 active ready running +|- 1:0:3:18 sdmd 69:336 active ready running +|- 1:0:2:18 sdjj 8:464 active ready running +|- 0:0:3:34 sdjt 65:368 active ready running +`- 0:0:2:34 sdgi 131:224 active ready running +``` + +这个过程适用于基于 Red Hat 6.x、7.x 和 8.x（RHEL - Red Hat Enterprise Linux）的系统，如 CentOS 和 Oracle Linux。 + +### 方法 1：如何使用 “/sys” 类文件在 Linux 上扫描新的 LUN 和 SCSI 磁盘 + +sysfs 文件系统是一个伪文件系统，它为内核数据结构提供了一个接口。 + +sysfs 下的文件提供了关于设备、内核模块、文件系统和其他内核组件的信息。 + +sysfs 文件系统通常被挂载在 “/sys”。通常，它是由系统自动挂载的。 + +你可以使用 echo 命令来扫描每个 scsi 主机设备，如下所示： + +``` +# echo "- - -" > /sys/class/scsi_host/host[n]/scan +``` + +当你运行上面的重新扫描所有的命令时，三个破折号（“- – -“）指的是通配符选项。这些值如下： + +``` +# echo "c t l" > /sys/class/scsi_host/host[n]/scan +``` + +这里： + +* **c –** HBA 上的通道 +* **t –** SCSI 目标 ID +* **l –** LUN ID +* **n –** HBA 编号 + + + +运行下面的命令来查找系统中所有的主机总线编号： + +``` +# ls /sys/class/scsi_host +host0 host1 host2 +``` + +得到主机总线编号后，运行以下命令来发现新的磁盘： + +``` +# echo "- - -" > /sys/class/scsi_host/host0/scan +# echo "- - -" > /sys/class/scsi_host/host1/scan +# echo "- - -" > /sys/class/scsi_host/host2/scan +``` + +另外，还可以用 ”for 循环“用一条命令进行扫描。 + +``` +# for host in ls /sys/class/scsi_host/;do echo "- - -" >/sys/class/scsi_host/${host}/scan; done +``` + +你可以使用文章开头提到的 **[ls 命令][2]**来检查它们。 + +``` +# ls /dev/disk/by-id | grep -i "serial-hex of LUN" +``` + +### 方法 2：如何使用 rescan-scsi-bus.sh 脚本在 Linux 上扫描新的 LUN 和 SCSI 磁盘 + +确保你已经安装了 “sg3_utils” 包来使用这个脚本。否则，运行以下命令来安装它。 + +对于 **RHEL/CentOS 6/7** 系统，使用 **[yum 命令][3]**安装 sg3_utils。 + +``` +# yum install -y sg3_utils +``` + +对于 **RHEL/CentOS 8** 和 Fedora 系统，使用 **[dnf 命令][4]**安装 sg3_utils。 + +``` +# dnf install -y sg3_utils +``` + +现在你可以使用 rescan-scsi-bus.sh 脚本重新扫描 LUN。 + +``` +# ./rescan-scsi-bus.sh +``` + +-------------------------------------------------------------------------------- + +via: https://www.2daygeek.com/scan-detect-luns-scsi-disks-on-redhat-centos-oracle-linux/ + +作者：[Magesh Maruthamuthu][a] +选题：[lujun9972][b] +译者：[geekpi](https://github.com/geekpi) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://www.2daygeek.com/author/magesh/ +[b]: https://github.com/lujun9972 +[1]: https://www.2daygeek.com/how-to-find-wwn-wwnn-wwpn-number-of-hba-card-in-linux/ +[2]: https://www.2daygeek.com/linux-unix-ls-command-display-directory-contents/ +[3]: https://www.2daygeek.com/linux-yum-command-examples-manage-packages-rhel-centos-systems/ +[4]: https://www.2daygeek.com/linux-dnf-command-examples-manage-packages-fedora-centos-rhel-systems/ \ No newline at end of file