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CHAPTER 4 PERFORMING FILE SYSTEM MANAGEMENT TASKS
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Note An extent is a group of blocks. Working with extents speeds up administration and file handling on
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file systems that work with large files. Also, because every file is initially written to its own extent, working with extents prevents fragmentation of your file system.
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xfs_ncheck: Generates pathnames for inode numbers for XFS. Basically, it displays a list of all inodes on the XFS file system and the path to where the file with the given inode number is stored. xfs_mkfile: Creates an XFS file. This command is used to create files of a fixed size to an XFS file system. By default, these files are filled with zeroes. Summarized, XFS is the most feature-rich file system of all. Because of its flexibility, it is probably the best choice to store your company data, so use it for Samba shares, for example. Because you can also tune the size of the allocation unit, XFS is also a very efficient file system when writing very large files. Upon creation, make sure that you specify a large allocation unit to be used and you will get great performance.
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Creating File Systems
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You probably have an idea now as to what file system best fits the needs of your application. The next step is to create these file systems, which involves two steps. First, you need to create the device in which you want to store the files. This can be a partition, but it can also be an LVM logical volume. After creating the device, you can use the mkfs command to create the file system of your choice. I ll first explain how to create the devices in which you want to store your files.
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Creating Traditional Partitions
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You can use many utilities to create partitions on a server, but one utility can be considered the mother of all other utilities: fdisk. In this section, you ll learn how to use fdisk to create partitions on your disk. 1. From the command line as root, use the fdisk command followed by the name of the device in which you want to create the partition. If you want to create a partition on /dev/sdb, use fdisk /dev/sdb to open the partitioning utility. 2. The fdisk utility now opens its prompt. It may complain about the number of cylinders being greater than 1,024, but this dates from when many boot loaders were not able to handle hard drives with more than 1,024 cylinders, so you can ignore this message. A good start is to press the m (menu) key to tell fdisk to show a menu with all available options (see Listing 4-8).
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CHAPTER 4 PERFORMING FILE SYSTEM MANAGEMENT TASKS
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Listing 4-8. Working with fdisk root@ubuntu:~# fdisk /dev/sdb The number of cylinders for this disk is set to 36483. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) Command (m for help): 3. Press the p key to print the current partition table, which will provide an overview of the size of your disk in cylinders, the size of a cylinder, and all partitions that exist on that disk. Then fdisk asks again what you want to do. Press the n key on your keyboard to create a new partition. Listing 4-9. When Working with fdisk, Use the p Key Often So That You Can See the Current Partitioning Command (m for help): p Disk /dev/sdb: 300.0 GB, 300090728448 bytes 255 heads, 63 sectors/track, 36483 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System
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