wiki:TipAndDoc/storage/filesystem

Version 24 (modified by mitty, 14 years ago) (diff)

moved to LVM?

  1. fdisk
  2. mount(8)
    1. mount with UUID
    2. mount disk image
  3. NTFS
  4. swapが複数あるときの優先順位
  5. testing xfs_growfs
  6. undelete
    1. ext3 / ext4

    fdisk

    • Supported suffix 
      Supported: 10^N: KB (KiloByte), MB (MegaByte), GB (GigaByte)
            2^N: K  (KibiByte), M  (MebiByte), G  (GibiByte)
    • change a partition's system id 
      Hex code (type L to list codes): L

 0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris
 1  FAT12           39  Plan 9          82  Linux swap / So c1  DRDOS/sec (FAT-
 2  XENIX root      3c  PartitionMagic  83  Linux           c4  DRDOS/sec (FAT-
 3  XENIX usr       40  Venix 80286     84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
 4  FAT16 <32M      41  PPC PReP Boot   85  Linux extended  c7  Syrinx
 5  Extended        42  SFS             86  NTFS volume set da  Non-FS data
 6  FAT16           4d  QNX4.x          87  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS       4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility
 8  AIX             4f  QNX4.x 3rd part 8e  Linux LVM       df  BootIt
 9  AIX bootable    50  OnTrack DM      93  Amoeba          e1  DOS access
 a  OS/2 Boot Manag 51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O
 b  W95 FAT32       52  CP/M            9f  BSD/OS          e4  SpeedStor
 c  W95 FAT32 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs
 e  W95 FAT16 (LBA) 54  OnTrackDM6      a5  FreeBSD         ee  GPT
 f  W95 Ext'd (LBA) 55  EZ-Drive        a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            56  Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    5c  Priam Edisk     a8  Darwin UFS      f1  SpeedStor
12  Compaq diagnost 61  SpeedStor       a9  NetBSD          f4  SpeedStor
14  Hidden FAT16 <3 63  GNU HURD or Sys ab  Darwin boot     f2  DOS secondary
16  Hidden FAT16    64  Novell Netware  af  HFS / HFS+      fb  VMware VMFS
17  Hidden HPFS/NTF 65  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  70  DiskSecure Mult b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 75  PC/IX           bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3 80  Old Minix       be  Solaris boot    ff  BBT
1e  Hidden W95 FAT1

    mount(8)

    mount with UUID

    mount disk image

    NTFS

    swapが複数あるときの優先順位

    • ​swapon.2
      • Each swap area has a priority, either high or low. The default priority is low. Within the low-priority areas, newer areas are even lower priority than older areas.
      • All priorities set with swapflags are high-priority, higher than default. They may have any non-negative value chosen by the caller. Higher numbers mean higher priority.
      • Swap pages are allocated from areas in priority order, highest priority first. For areas with different priorities, a higher-priority area is exhausted before using a lower-priority area. If two or more areas have the same priority, and it is the highest priority available, pages are allocated on a round-robin basis between them.
    • ​SWAP Priority Setting - Ubuntu Forums

    testing xfs_growfs

    • 結論
      • diskの後方に向けて拡張するのは、開始セクタを変えずにパーティションを切り直し、リマウントしてxfs_growfsすればよい
      • diskの前方に向けて拡張するのは、パーティション内容をあらかじめdd等で移動する手間が必要
        • データ総量が十分小さければ、前方にあらかじめ別のパーティションを切り、cpした上で古いパーティションを削除して、新しいパーティションを後方拡張する方が操作ミスを起こしにくいと思われる
      • LVMを使えばより単純になると思われる
        • ただし、LVM自体を扱う手間が増える(障害時の復旧手順が複雑化)
    • see xfs_growfs?

    undelete

    ext3 / ext4