1. COP 4343 Unix 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 make via
ext2 evolution
make via
mkfs –t ext3
mkfs.ext3
make options: -L and –m
change parameters:
tune2fs

4. other File Systems reiserfs xfs jfs 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 soft limit hard limit strictly enforced
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