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Filesystem , swap, device

ravel@sparcs. Filesystem , swap, device. 1. Filesystem. In computing , a file system (often also written as filesystem ) is a method for storing and organizing computer files and the data they contain to make it easy to find and access them. ( wikipedia ) Permits random access 추상화.

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Filesystem , swap, device

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  1. ravel@sparcs Filesystem, swap, device

  2. 1. Filesystem • In computing, a file system (often also written as filesystem) is a method for storing and organizingcomputer files and the data they contain to make it easy to find and access them. (wikipedia) • Permits random access • 추상화

  3. 종류 • ext2/ext3 • VFAT / NTFS • Iso9660/UDF • /proc /proc/filesystems에서 확인

  4. mount! • #mount –t : 파일시스템 가져다 붙이기

  5. mount! • #mount –t type device mount-point • #mount –t msdos /dev/fd0 /mnt • #mount –t iso9660 –r /dev/cdrom /mnt(read only)

  6. mount! • #mount –a /etc/fstab에 있는 모든 장치들을 마운트 • #umount /dev/fd0 #umount /mnt • #umount –f

  7. mount! • #mount • Mount errors

  8. /etc/fstab • #mount –t <type> <file system> <mount point>이 명령이 부팅할 때 이루어짐

  9. /etc/fstab • Q : /etc/fstab에는 어떻게 접근하나?A: 커널이먼저 /에 /etc/fstab를 담고있는 디바이스를 마운트

  10. 파일시스템 만들기 • #mkfs –t type device • #fdformat

  11. 파일시스템 만들기 • #mkfs -cchecks for bad blocks

  12. 파일시스템 검사하기 • #fsck –t type device • #fsck –t ext3 /dev/hda안됩니다

  13. 파일시스템 검사하기 • Boot/root floppy • Mount root as ro(?)

  14. 파일시스템 검사하기 • #fsck –v정보 출력 • #fsck –a모든 파일시스템 점검

  15. 2. Swap • Swap file: RAM에 빈공간이 없을 때 메모리 구실을 하는 특수한 파일 • Swap out/in : 메모리에서 하드로 / 하드에서 메모리로

  16. 스왑 • $free단위는 1024-byte block

  17. 스왑 만들기 • A) 스왑파일B) 스왑파티션-> fdisk

  18. 스왑 만들기 • $dd if=/dev/zero of=/swap bs=1024 count=32768 • #mkswap device size#mkswap –c device (size) • #chmod 0600 /swap

  19. 스왑 활성화 • #swapon device • Modify /etc/fstab • #swapoff device

  20. 3.Device files • Device file : 디바이스를 하나의 파일처럼 만들기(추상화!)

  21. b/c • major device number, minor device number

  22. Symbolic links

  23. 디바이스 파일 만들기 • #mknod –m permissions name type major minor#mknod /dev/ravelhdd b 42 0 • $/dev/MAKEDEVdefault permissions : umask (0644)

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