Disk works
Cylinder Head Sector tracks
Category disk: mechanical disk SSD
IO - Serial sata scsi (iscsi) parallel ata
File system
The disk must have a file system
windows fat32 ntfs exfat
linux single file system - ext2 3 4 xfs
iNode - index space
block - storage space
Data stored procedures, data replication, data deletion process
Dynamic management --LVM Logical Volume Management
Completed by the Linux kernel module - dm module
We will integrate one or more disks, re-divide
First define PV (physical volume)
Then define the volume group VG
Finally, we'll get the space from VG LV (Logical Volume)
biggest advantage:
You can delete or add free space, eliminating the need to re-partition
LV add disk space: lvextend
LV delete disk space: lvreduce
Last action:
Disk mirroring to mirror LV command may be a logical partition
This feature and use a database, data backup
lvcreate -n Morrie_LV -s -p r -L 1000M /dev/mapper/VGname-LVname
/dev/VGname/LVname
Disk Management disk redundancy --RAID
Complete (Software RAID) by the Linux kernel module - md module
Redundant array of inexpensive disks
Redundant array of independent disks
1, redundancy
2, to improve the performance of read and write
raid0 - striping
raid1 - mirroring
raid4 - check disk
raid5 - checksum values stored in the fast disk
raid6 - secondary calibration
raid10 better than raid01
divided into hard and soft raid raid raid
Hard raid - raid card is required to achieve
Soft raid - will not do soft raid on the job, do not do raid by raid disk partition
mdadm
Disk name:
md/sd/hd/vd
primary partitions sda1 2 3 4
Extended partition can have multiple