Boot from SAN environments 编辑

Boot-from-SAN environments offer several advantages, including high performance, redundancy, and space consolidation. In these environments, the boot disk is on a remote SAN and not on the local host. The host communicates with the SAN through a host bus adapter (HBA). The HBA’s BIOS contains the instructions that enable the host to find the boot disk.

Boot from SAN depends on SAN-based disk arrays with either hardware Fibre Channel or HBA iSCSI adapter support on the host. For a fully redundant boot from SAN environment, you must configure multiple paths for I/O access. To do so, ensure that the root device has multipath support enabled. For information about whether multipath is available for your SAN environment, consult your storage vendor or administrator. If you have multiple paths available, you can enable multipathing in your Citrix Hypervisor deployment upon installation.

Warning:

Boot-from-SAN settings are not inherited during the upgrade process. When upgrading using the ISO or network-boot, follow the same instructions as used in the installation process below to ensure that multipath is correctly configured.

To install Citrix Hypervisor to a remote disk on a SAN with multipathing enabled from the installer UI:

1. Boot the computer from the installation media or by using network boot. For more information, see Install the Citrix Hypervisor server

2. Following the initial boot messages, you see one of the following screens:

   • If you are doing a BIOS installation, you see the Welcome to Citrix Hypervisor screen.

     

     1. At the welcome screen, press F2 to select Advanced install.
     2. At the boot prompt, enter multipath

   • If you are doing a UEFI installation, you see a GRUB menu. This menu is shown for 5 seconds.

     

     1. On the GRUB menu, choose multipath and press Enter.

The Citrix Hypervisor installation process configures the Citrix Hypervisor server, which boots from a remote SAN with multipathing enabled.

To install Citrix Hypervisor to a remote disk on a SAN with multipathing enabled by using a configuration file:

To enable file system multipathing using PXE or UEFI installation, add device_mapper_multipath=yes to your configuration file. The following is an example configuration:

default xenserver
label xenserver
   kernel mboot.c32
   append /tftpboot/xenserver/xen.gz dom0_max_vcpus=1-2 \
   dom0_mem=1024M,max:1024M com1=115200,8n1 \
   console=com1,vga ---  /tftpboot/xenserver/vmlinuz \
   xencons=hvc console=hvc0 console=tty0 \
   device_mapper_multipath=yes \
   install ---  /tftpboot/xenserver/install.img
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