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COP 4343 Unix System Administration

COP 4343 Unix System Administration. Unit 6: file systems /etc/fstab swap space quotas. File System Tasks. prepare partition with fdisk make file system mkfs check file system fsck options: -a -n -i mount file system mount vs. umount add to system setup /etc/fstab.

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COP 4343 Unix System Administration

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  1. COP 4343Unix System Administration Unit 6: file systems /etc/fstab swap space quotas

  2. File System Tasks • prepare partition with fdisk • make file system • mkfs • check file system • fsck • options: -a -n -i • mount file system • mount vs. umount • add to system setup • /etc/fstab

  3. ext3 File Systems • journaling file system • ext2 evolution • make via • mkfs –t ext3 • mkfs.ext3 • make options: -L and –m • change parameters: • tune2fs

  4. other File Systems • reiserfs • reiserfs-utils • fast, sponsored by DARPA • xfs • xfsprogs • SGI, 64 bit • jfs • jfsutils • IBM, high-end servers

  5. /etc/fstab • Fields • Device name or volume label • Mount point • Filesystem type • Mount options • defaults, rw, ro, suid, user • usrquota, grpquota • frequency (for dump command) • pass number (for fsck)

  6. Swap Space • create area for additional virtual memory • can be: disk partition or file • dd if=/dev/zero of=swapfile bs=1024 count=... • prepare via mkswap • partition or file • add to swap space • swapon • /etc/fstab

  7. Quotas • allows to set limits on • diskspace used by user or group • number of blocks • number of inodes • soft limit • allows temporary overage • has grace period • hard limit strictly enforced • needs kernel support

  8. enabling quotas • check & possibly recompile kernel • label filesystem in fstab • usrquota or grpquota • create and check setup • quotacheck –va • creates control files • aquota.user or aquota.group • turn quotas on • quotaon -av

  9. quota utilities • set soft and hard limit for blocks and inodes • edquota username • setquota • set grace period • edquota –t • check quota for user • quota

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