1 / 18

Disk Volume Management

Disk Volume Management. Terms. Extent – any contiguous set of clusters Partition – extent treated as a disk Volume - partition formatted with a file system Basic disk - basic volumes and logical drives Dynamic disks. Windows. Basic disk. Exists on single physical drive

elmer
Télécharger la présentation

Disk Volume Management

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Disk Volume Management

  2. Terms • Extent – any contiguous set of clusters • Partition – extent treated as a disk • Volume - partition formatted with a file system • Basic disk - basic volumes and logical drives • Dynamic disks

  3. Windows

  4. Basic disk • Exists on single physical drive • Uses DOS partition tables • Simple volume (contiguous extents) • Primary partitions • Extended partitions • Logical drives • USB removable drives

  5. Dynamic disks (Windows) • Simple volume ≈ primary partition or logical drive • Only 1 user accessible partition • Not for bootable volumes • Up to 1000 volumes on a system • Rely on Logical Disk Manager (LDM) and Virtual Disk Service • Allows non-contiguous extents

  6. Dynamic disk volume types • Spanned volumes • Extended volumes • Striped volumes • Mirrored volumes • Raid-5 volumes

  7. Partitions • Master Boot Record (DOS style) for Windows • 2 choices • 4 primary partitions (maximum) • 3 Primary + 1 extended partition • Globally Unique ID style • Basic disk: Up to 128 primary partitions • Dynamic disk: 1 LDM partition (like MBR)

  8. GUID • Allows partitions > 2 terabytes • Added reliability • Replication & CRC for partition table

  9. MBR example (Basic disk) Master boot code 1st Ptable entry Partition table 2ndPtable entry MBR 3rdPtable entry 4thPtable entry 0x55AA Primary Partition 1 C: Primary Partition 2 E: Primary Partition 3 F: Logical Drive G:: Extended Partition Logical Drive H:: Extended partition does NOT have to be last. Must be contiguous space.

  10. Dynamic disk MBR • Similar to Basic MBR layout • No extended partitions • Only ONE Primary partition • Called the LDM partition • Hidden partition at end for LDM DB

  11. Dynamic disk • Contains: • simple volumes • spanned volumes • striped volumes • mirrored volumes* • RAID-5 volumes* * Depends on O/S version

  12. Dynamic Storage Terms • Simple vol: space on 1 disk • Spanned vol: linked space on ≥ 1 disks • NOT fault tolerant • CANNOT be mirrored

  13. Linux

  14. A truism • On a Unix system, everything is either a file or a process. • Directories are just files with names of other files • Devices are treated as files with special attributes • http://en.wikipedia.org/wiki/Comparison_of_file_systems

  15. Partition management • Logical Volume Manager (kernel) • Loaders • LILO (LInux boot LOader) • GRUB (GRandUnified Boot loader) • Partitioning programs • fdisk • Gparted(Gnome partition editor) • KDE Partition Manager

  16. Layout (from Wikipedia) PE=Physical Extent

  17. Linux File Systems • Ext (1992) • Ext2 (1993)- pref for SD & USB • XFS (1994) – B-tree larger than its files • Ext3 (1999) – journal, slow, htreeindex, max filesystemsize=32TB • Ext4 (2006) – max filesystemsize=1 EB (1M TB)

  18. Htree indexing • Constant depth of 1 or 2 levels • Hashes filename • No rebalancing

More Related