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Re: [Xen-devel] The file system type of DomU is ext2 or ext3?

To: Ye Zhou <zhouyejoe@xxxxxxxxxxx>
Subject: Re: [Xen-devel] The file system type of DomU is ext2 or ext3?
From: "Mohammad Abdul-Amir (Shamma)" <mohammadshamma@xxxxxxxxx>
Date: Mon, 21 Dec 2009 02:15:42 -0800
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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What are the contents of the DomU's /etc/fstab? One thing to check is the type of the root file system in that file.

2009/12/21 Ye Zhou <zhouyejoe@xxxxxxxxxxx>
Hi, all:
     At first I have an idea to improve the performance of the log mechanism in ext3 file system of DomU, but when I do some experiment in DomU, I find a strange thing.
     When I input command "df -lhT" to see the file system type, it shows that it is ext3. But when I input command "cat /proc/mounts", it shows that "/dev/root / ext2 rw".This means the type is still ext2. So I can't do my experiments.
     # df -lhT
     >Filesystem    Type    Size  Used Avail Use% Mounted on
     >/dev/sda1     ext3    9.2G  3.7G  5.1G  42% /
     >tmpfs        tmpfs    129M     0  129M   0% /dev/shm
     # cat /proc/mounts
     >rootfs / rootfs rw 0 0
     >/dev/root / ext2 rw 0 0
     >/proc /proc proc rw 0 0
     >/sys /sys sysfs rw 0 0
     >/proc/bus/usb /proc/bus/usb usbfs rw 0 0
     >none /dev tmpfs rw 0 0
     >devpts /dev/pts devpts rw 0 0
     >tmpfs /dev/shm tmpfs rw 0 0
     >none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
     >sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
     >/etc/auto.misc /misc autofs rw,fd=6,pgrp=2065,timeout=300,minproto=5,maxproto=5,indirect 0 0
     >-hosts /net autofs rw,fd=11,pgrp=2065,timeout=300,minproto=5,maxproto=5,indirect 0 0
      I made  the DomU OS image by simply copying the main files from Dom0,and in Dom0 it shows it is ext3.
      Whether I made the wrong way in making the image? Or there are some other problems? I don't kown why!
      Thanks all!
Best Regarding!
                Ye  Zhou
Cluster and Grid Computing Lab
Services Computing Technology and System Lab
Department of Computer Science
Huazhong University of Science and Technology Wuhan, 430074, China


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