Summary #2 - Network and System Administration(NSA)

let's continue....


Desktop Familiarization

Linux desktop
1) Text Mode (6 consoles CTRL-ALT-F1[6]
2) GUI Mode CTRL-ALT-F7 
->GNOME(default desktop)
->KDE
switchdesk command - change desktop environment


partitioning-divide single hd into many logical drives
partition-contiguous set of blocks treated as independent disk


why multiple partitions?
reduce system failure


partition fields
1)device-partition's device name
2)start-sector where partition begins
3)end-sector where partition ends
4)size-partition's size(MB)
5)type-partition's type(ext2,ext3,vfat)
6)mount point-location within directory hierarchy where volume exists


filesystem type
ext2 — supports standard Unix file types (regular files, directories, symbolic links, etc).
ext3 — based on the ext2 filesystem with journaling- reduces time spent recovering a filesystem after a crash-no need to fsck the filesystem.
swap — support virtual memory. data is written to a swap partition when not enough RAM to store the data your system is processing.
vfat — compatible with Windows 95/NT long filenames on the FAT filesystem. 


IDE Disk Partitions
/dev/hda (Primary Master Disk)
/dev/hda1 (First Primary Partition)
/dev/hda2 (Second Primary Partition)
/dev/hdb (Primary Slave Partition)
/dev/hdb1
/dev/hdc (Secondary Master/Slave Partition)
/dev/hdc1
SCSI Disk Partitions
/dev/sda1, /dev/sda2
/dev/sdb1, /dev/sdb2
/dev/sdc1, /dev/sdc2


Software RAID (Redundant Array of Inexpensive Disk)
RAID 0 (Striping)
RAID 1 (Mirroring)
RAID 5 (Striping with Parity)
LVM (Logical Volume Manager)

Boot Loader

to load OS- BIOS  looks for instructions on the first sector of hd.

first sector of the hd resides master boot record (MBR)-boot loader is initialized .

additional files may be stored and read from a partition

Ai no ōku,
fanilzekazuyama