Solution when the operation of installing the multipathing software is not activated

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Solution when the operation of installing the multipathing software is not activated:
FAQ-How Can I Handle the Problem that the Installed Multipathing Software Is not Activated

Other related questions:
Solution if an error is reported if you install the multipathing software using a disk on a device running the Linux operating system
Solution if an error is reported if you install the multipathing software using a disk on a device running the Linux operating system: Check whether the installation script of the multipathing software /home/linux/Packages contains an uppercase P. If it contains an uppercase P, an error is reported because the directory name of disks cannot contain uppercase letters. In this case, you need to copy the upgrade package from the disk to the local disk.

Solution if a message indicating unknown kernel is prompted during the installation of the multipathing software because the operating system version of the Linux host is different from the kernel version
Solution if a message indicating unknown kernel is prompted during the installation of the multipathing software because the operating system version of the Linux host is different from the kernel version: When you install the multipathing software, if the kernel version of the software package is different from the operating system version, a message indicating unknown kernel will be prompted. 1. Run cat cat /etc/xxx-release (xxx indicates the name of the Linux distribution, for example, Red Hat or SUSE) to check the operating system version. # cat /etc/redhat-release Red Hat Enterprise Linux AS release 4 (Nahant Update 7) 2. Run uname -a to query the kernel version of the Linux operating system. # uname -a Linux ctucipjrlx007 2.6.9-78.ELsmp #1 SMP Sat Nov 26 08:44:12 CST 2011 i686 i686 i386 GNU/Linux 3. Check whether the operating system version is different from the kernel version. 4. If the operating system version is different from the kernel version, change the operating system version in /etc/xxx-release to the version in table 1 and reinstall the multipathing software.

Method used to check newly mapped LUNs on the server not installed with the multipathing software
Method used to check newly mapped LUNs on the server not installed with the multipathing software: 1. Log in to the application server. 2. Run cd /sys/class/scsi_host/ to enter the /sys/class/scsi_host/ directory. # cd /sys/class/scsi_host/ 3. Run ls to check the HBA card port in the /sys/class/scsi_host/ directory (for example, host0, host1, and host2). # ls host0 host1 host2 host3 host4 host5 host6 host7 host8 4. Run echo "- - -" > /sys/class/scsi_host/host*/scan to scan for disk devices. host* is an HBA card port. The LUN mapped to the HBA card port host2 is used as an example. # echo "- - -" > /sys/class/scsi_host/host2/scan 5. Run lsscsi to check LUN s newly mapped to the server. # lsscsi [0:0:0:0] cd/dvd hp DVD D DS8D3SH HHE7 /dev/sr0 [2:0:0:0] disk HUASY S5500T 2105 - [2:0:0:1] disk HUASY S5500T 2105 - [2:0:0:2] disk HUASY S5500T 2105 - [2:0:0:3] disk HUASY S5500T 2105 - [2:0:0:4] disk HUASY S5500T 2105 - [2:0:0:5] disk HUASY S5500T 2105 - [2:0:0:6] disk HUASY S5500T 2105 - [2:0:0:7] disk HUASY S5500T 2105 - [2:0:0:8] disk HUASY S5500T 2105 - [2:0:1:0] disk HUASY S5500T 2105 - [2:0:1:1] disk HUASY S5500T 2105 - [2:0:1:2] disk HUASY S5500T 2105 - [2:0:1:3] disk HUASY S5500T 2105 - [2:0:1:4] disk HUASY S5500T 2105 - [2:0:1:5] disk HUASY S5500T 2105 - [2:0:1:6] disk HUASY S5500T 2105 - [2:0:1:7] disk HUASY S5500T 2105 - [2:0:1:8] disk HUASY S5500T 2105 - [3:0:0:0] disk HUASY S5500T 2105 - [3:0:0:1] disk HUASY S5500T 2105 - [3:0:0:2] disk HUASY S5500T 2105 - [3:0:0:3] disk HUASY S5500T 2105 - [3:0:0:4] disk HUASY S5500T 2105 - [3:0:0:5] disk HUASY S5500T 2105 - [3:0:0:6] disk HUASY S5500T 2105 - [3:0:0:7] disk HUASY S5500T 2105 - [3:0:0:8] disk HUASY S5500T 2105 - [4:0:0:0] disk up updisk 2105 /dev/sda [4:0:0:1] disk up updisk 2105 /dev/sdb [4:0:0:2] disk up updisk 2105 /dev/sdc [4:0:0:3] disk up updisk 2105 /dev/sdd [4:0:0:4] disk up updisk 2105 /dev/sde [4:0:0:5] disk up updisk 2105 /dev/sdf [4:0:0:6] disk up updisk 2105 /dev/sdg [4:0:0:7] disk up updisk 2105 /dev/sdh [4:0:0:8] disk up updisk 2105 /dev/sdi

Solution if a message indicating that the host needs to be restarted is displayed repeatedly when the multipathing software is being reinstalled on a Windows host after it is uninstalled
Solution if a message indicating that the host needs to be restarted is displayed repeatedly when the multipathing software is being reinstalled on a Windows host after it is uninstalled: Delete the Restart key value in the registry. The position where the key value of Restart is stored varies with Windows systems: 1. Windows x86 system: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run 2. Windows x64 system: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run 3. Restart the host.

Rival to the MacroSAN active-active solution
MacroSAN active-active solution realizes disaster recovery switchover at the application level by adopting the storage remote replication feature (synchronous/asynchronous), third-party arbitration, and multipathing software equipped in the host OS. Huawei’s active-active solution has the following countermeasures: 1. MacroSAN active-active solution is asymmetric, and the system works in active/standby mode. I/Os of the standby site are forwarded to the active site. In essence, the solution uses the volume mirror. The active-active solutions of other vendors and Huawei are symmetric. There is no active/standby site and I/O requests are processed at both sites. 2. MacroSAN active-active solution has distance limitation. In this solution, devices are mirrored by 10GE links. The high latency does not allow the distance between sites to be longer than 10 km. However, Huawei active-active solution allows the distance between two sites to be 100 km.

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