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XenのホストOS (domain0) に割り当てるメモリを設定する方法。

OS起動時にホストOSのメモリを設定する方法。

・/boot/grub/grub.conf
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.15.1.el5xen)
    root (hd0,0)
    kernel /xen.gz-2.6.18-164.15.1.el5
    module /vmlinuz-2.6.18-164.15.1.el5xen ro root=/dev/VolGroup00/LogVol00
    module /initrd-2.6.18-164.15.1.el5xen.img
title CentOS (2.6.18-164.el5xen)
    root (hd0,0)
    kernel /xen.gz-2.6.18-164.el5
    module /vmlinuz-2.6.18-164.el5xen ro root=/dev/VolGroup00/LogVol00
    module /initrd-2.6.18-164.el5xen.img

↓ 割り当てメモリを指定
# grub.conf generated by anaconda
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.15.1.el5xen)
    root (hd0,0)
    kernel /xen.gz-2.6.18-164.15.1.el5 dom0_mem=300M
    module /vmlinuz-2.6.18-164.15.1.el5xen ro root=/dev/VolGroup00/LogVol00
    module /initrd-2.6.18-164.15.1.el5xen.img
title CentOS (2.6.18-164.el5xen)
    root (hd0,0)
    kernel /xen.gz-2.6.18-164.el5
    module /vmlinuz-2.6.18-164.el5xen ro root=/dev/VolGroup00/LogVol00
    module /initrd-2.6.18-164.el5xen.img

そして再起動します。