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Contents
Chapter 1 Understanding Veritas Volume Manager
VxVM and the operating system .......................................................................19
How data is stored ........................................................................................19
How VxVM handles storage management .......................................................20
Physical objects—physical disks ................................................................20
Virtual objects ..............................................................................................26
Volume layouts in VxVM ....................................................................................34
Implementation of non-layered volumes .................................................34
Implementation of layered volumes .........................................................34
Layout methods ............................................................................................35
Concatenation and spanning .....................................................................35
Striping (RAID-0) .........................................................................................38
Mirroring (RAID-1) ......................................................................................42
Striping plus mirroring (mirrored-stripe or RAID-0+1) ........................42
Mirroring plus striping (striped-mirror, RAID-1+0 or RAID-10) .........43
RAID-5 (striping with parity) .....................................................................45
Layered volumes ..........................................................................................51
Online relayout .....................................................................................................54
How online relayout works .........................................................................54
Limitations of online relayout ...................................................................57
Transformation characteristics .................................................................58
Transformations and volume length ........................................................58
Volume resynchronization .................................................................................59
Dirty flags ......................................................................................................59
Resynchronization process ........................................................................59
Dirty region logging ............................................................................................60
Dirty region logs ...........................................................................................60
Log subdisks and plexes ..............................................................................61
Sequential DRL .............................................................................................61
SmartSync recovery accelerator ...............................................................62
Volume snapshots ................................................................................................63
Comparison of snapshot features ..............................................................65
FastResync ............................................................................................................66
FastResync enhancements .........................................................................67
Non-persistent FastResync ........................................................................67
Persistent FastResync .................................................................................68