Check Debian File system with fsck for xenserver virtual servers

1. Insert the installation CD-1 of the XenServer host into CD-ROM drive where the file system to check is located. Start the installation process and stop at a point where it displays dialog box with title Confirm Installation and asks you to press Install XenServer. From the message shown in the dialog box, write down the path for the disk. For example: "Please confirm you wish to proceed: all data on disk /dev/sda will be destroyed."

2. Press ALT + F2 (you can toggle between the installation screen and the command prompt using ALT + F1 and ALT + F2). It prompts you to log on. Log on as the root user and you see the following prompt:
[root@(none)~]#

3. Run the fsck command as follows:
[root@(none)~]# fsck /dev/sda