Lvs show logical volume information lvcreate create

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lvs (show Logical Volume information)lvcreate (create Logical Volume)lvextend (grow Logical Volume)lvreduce (shrink Logical Volume)lvrename (rename Logical Volume)lvremove (remove Logical Volume)
lv commands.
Volume Group commandsvgdisplay (list Volume Groups)vgs (show Volume Group information)vgcreate (create Volume Group)vgextend (add Physical Volume to VG)vgreduce (shrink Volume Groupvgrename (rename Volume Group)vgremove (remove Volume Group)
vg commands.
Raid OverviewRAID ConceptsRAID OriginsRAID TypesRAID on CentOS
RAIDRedundant Array Independent Disks
RAID ConceptsRedundant Array of Independent DisksView one logical disk from many physical disksImproves performance using stripingImproves availability using mirroringImproves reliability using parity
RAID OriginsIn 1990s, CPU and RAM speeds increased much faster than disks (ns vs ms)Disk access is the slowest aspect of program executionStorage cost ($/mb) decreased dramatically
Disk Hardware Architecture.
RAID Types.TypeStripingMirroringParityRAID0XRAID1XRAID3XXRAID4XXRAID5XXXRAID10XXRAID0+1XX
RAID0 (Striping)Data is split evenly across multiple drivesImproves performance because separate drives can be accessed at the same timeBit-level vs Block-level striping
RAID 1 (Mirroring)Same data is copied to multiple drivesImproves availability because no data is lost when one drive fails
RAID 3 (Striping + Parity)Data is split evenly across multiple drivesOne drive contains Bit-Level parity dataImproves reliability because parity data can be used to restore the data if one drive fails
RAID 5 (Striping + Parity)Same as RAID 3 but Block-Level (not Bit-Level) parity data spread across all drivesImproves reliability because parity data can be used to restore the data if one drive fails
RAID 01 0+1Striped disks (RAID0) that are mirrored (RAID1)Provides performance and availability
RAID 10 (1+0)Mirrored disks (RAID1) that are striped (RAID0)Provides performance and availabilityWhat is RAID 0, 1, 2, 3, 4, 5, 6 and 10 (9:56)
RAID on CentOSyum install mdadmmdadm – md admin (for raid volumes)- - create- - detail- - examine/etc/mdadm.conf
Unit 3System Management
Startup and Shutdown
Startup/Shutdown OverviewBoot sequenceGRUBInit ProcessShutdown

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