Disk works - the physical
track sector cylinder heads
Category disks: mechanical disk (Interface IO), solid state disk
IO: serial sata scsi (iscsi)
parallel ATA
FC Layer protocol (Xerox - Ethernet technology, explains the object-oriented programming language, graphical interface)
File System - Logical
disk must have a file system (data storage) - Database (data management platform)
awk
Windows NTFS FAT32 exFAT
Linux but the file system - ext2 3 4 xfs
inode - index space (file attributes)
Block - data storage
data storage process, the process of data replication, data deletion process
fdisk - partition parted
mkfs -t
Mount -o remount, rw
-a / etc / fstab
mount or unmount the file overload point
dynamic management - LVM logical volume management
linux kernel module - dm
we will integrate one or more disks, re-division;
first, we need to define PV (physical volumes)
then, again defined VG (volume group)
Finally, acquired from VG space --LV (logical)
the biggest advantage:
you can delete or add free space, you do not need to repartition;
the pvcreate the vgcreate named lv -l | -L -n specifies the name of the specified size
lvextend - add disk space
lvreduce - delete disk space
last action:
to mirror command lv lv can do disk image for the logical partition;
this function and use a database, data is;
lvcreate -L -n Morrie_LV -s -pr 1000M / dev / Mapper / VGname-LVname
/ dev / VGname / LVname
Disk management disk redundancy --RAID
(software RAID) linux kernel module - md
inexpensive redundant disk array
independent redundant disk array
1, redundant
2, increase read and write performance
raid0 - striping Disk 1 Disk 2
raid1 - mirroring
raid4 - at least three disk check disk (RAID degraded)
RAID5 - a check value are stored in the plurality of disk
raid6 - secondary calibration
raid10 do first mirror, the strips do ( better)
RAID 01
RAID50
hard raid - raid card is required to achieve (BIOS provides raid card management)
software raid - will not do soft raid on the job (reduces the CPU performance)
if you do: you can use the disk to do the raid , (do not use partition);
the mdadm disk management
mdadm -C / dev / md0 -l 1 -n 2 / dev / sdb2 -x / dev / sdb3
disk name:
MD / SD / HD / VD
ABC SDA SDB
. 1 2. 3 4 sda1 sda2