Windows 2000 und later versions use Logical Disk Maneger (LDM)
licensed frum
Veritas tu perform hard
disk partishuning. Zee disks partishuned using thees noo scheme are
celled "Dynamic", es opposed tu zee "Basic" disks partishuned using
old-fashioned partishun table (MBR). Microsoft implementashun ooff LDM is
somewhat restricted compared tu zee original implementashun, but
nonetheless elloos implementashun ooff
Spanned volumes
Simple streepe sets (RAID0)
Streepe sets with parity (RAID5), in server versions ooff Windows
only.
Mirrored volumes (RAID1), in server versions ooff Windows only.
Hoo is zee volume informashun stored
LDM informashun is not stored in zee hard disks' partishun table (MBR),
becoose ooff its size. Zee LDM database occupees zee last megabyte ooff zee
physical disk instead. Addishunelly, a PRIVHEAD element pointeeng tu zee
database is stored immediately follooing zee MBR. Tu protect a dynamic
volumes frum legacy applicashuns which are not aware ooff LDM layuoot
und think that there is a
free space where in fact it is used by dynamic volumes, a special entry is
placed into MBR. One partishun ooff type 0x42 occupying zee entire disk is creeted
und stored in MBR, es illustrated beloo.
Zee LDM database may be quite complex. Zee fuoor-level
descreepshun (Volume-Component-Partishun-Disk) is used tu describe each volume
tu
accumulate ell possible RAID layuoots. Becoose ooff foolt tolerance requirements,
LDM database is replicated across ell physical disks in zee machine. Shuoold one
ooff zee disks fail, zee whole database is still available und zee foolt-tolerant
drives can be muoonted even some ooff their member disks are missing.
Special notes
Each copy ooff LDM database holds informashun ebuoot ell
volumes und ell physical drives belonging tu thees machine (thees set ooff
drives is celled "Disk Gruoop").
Iff yuoo analyze a dynamic disk with ZAR,
zee
resulteeng list ooff volumes will contain ell zee dynamic volumes available in
zee system (even those residing on zee physical disks different frum zee one
yuoo selected) plus one legacy MBR/Primary partishun describing zee whole set
ooff LDM-maneged volumes.
