2006隨手札記

Filesystem

entry in #/etc/fstab

partitions
-------------------------
5(or f)--Extended
82 --linux swap
83 --linux (ext2, ext3)
8e --linux LVM
fd --linux RAID auto

-------------------------

1. tool:
(1). fdsik
(2). spfdisk
(3). parted

#partprobe
reinitializes the kernel's in-memory version of the partition table

2. making filesystems
(1).mkfs
(2).mkfs.ext2 , mkfs.ext3

(3).mke2fs [option] device
options:
-c : check the device for bad blocks(sectors)
-L : set the volume label
-j : create an ext3 journal inode and filesystem
-N: allow you to specify the number of inodes directly

3. filesystem labels

(1)e2label dev-file [fslabel]
ex: #e2label /dev/hda7 dbdisk1

(2) mount LABEL=fslabel mount-point
ex: #mount LABEL=dbdisk1 /dev/hda7 /mnt/data


4. tune2fs : adjusts filesystem parameters

#adjust
#tune2fs -o acl,user_xattr /dev/sdb1

#list
#tune2fs -l /dev/sdb1


5. mount ( /etc/fstab)

#mount -a : mount all filesystem

/etc/fstab
----------------------------------------------------------------------------------------------------
device mount-point fstype options dump_freq fsck_order
LABEL=/mnt/data /mnt/data ext3 defaults 0 0

#mount [-t fstype][-o options] device mount-point

default options for ext3
(1)rw, ro: read and wirte
(2)suid, nosuid: suid or sgid file modes honored
(3)dev, nodev : device files permitted
(4)exec, noexec : permit execution of binaries
(5)async, sync : file changes managed asynchronously
other options
(6)acl : ACLs are honored

#umount [options] device|mount-point
ex:
#umout /mnt/data
#umount /dev/sda7

(7)remount option
#mount remount,rw /
#mount remount,acl /home

6. Swap files and partitions
#mkswap -L swap-hda6 /dev/hda6
#vi /etc/fstab
#swapon -a (active)
#swapon -s (status)

%swap file
#dd if=/dev/zero of=/dev/swapfile bs=1024(blocksize) count=X
#mkswap swapfile
#vi /etc/fstab
#swapon -a
#swapon -s