Heinz Mauelshagen  LVM (Logical Volume Manager) howto      1999ǯ 10 2


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LVM ϰβۥǥ䲾ۥѡƥȤäǰ Linux
ڥ졼ƥ󥰥ƥɲäΤǤ

 LVM ˤäơʪŪʼյȥͥ˼Ƥ
I/O 󥿥եȤδ֤˥쥤ɲäޤ

LVM Ȥȡʪƥ (Physical ExtentPE) ȸƤФ˥åȤ
Ȥ뤳ȤˤꡢĤΥǥѡƥ󡢥ǥΡ
ޤ¿ͤʥǥХ˻ޤǤޤȤᡢ
ȥ졼סǤ褦ˤʤޤ
ǡȥ졼סܥ塼॰롼 (Volume GroupVG)
PE Υñ̤ȤʤǥѡƥǥΤ
ʪܥ塼 (Physical VolumePV) ȸƤӤޤ
Υܥ塼॰롼פϲۥǥȤƹͤ뤳ȤǤޤ
Υʥꥪ

 VG ΤĤΤޤϤ٤Ƥ PE ϡƥ
(Logical ExtentLE) Ȥñ̤ܥ塼 (Logical VolumeLV)
˥Ȥ뤳ȤǤޤ
 LE б PE ˥ޥåפޤ
LE  PE Ʊˤʤޤ
ܥ塼ϰβۥѡƥǤ


褯ȤƤ /dev/sd[a-z]*  /dev/hd[a-z]* ʤɤƱͤˡ
LV  /dev/ܥ塼॰롼̾/ܥ塼̾ Ȥ̾
ǥХڥե𤷤ƻѤ뤳ȤǤޤ

εǽ餷ΤϡVG ** LV ¹˳ĥ
̾ꤹ뤳ȤǤ뤳ȤʤΤǤ


㤨СLV λ̤ޤˤ⾮ʤäƤơ LV °Ƥ
VG äѤˤʤäƤޤä硢 VG ¾ PV ɲä LV
ñ˳ĥ뤳ȤǤޤ
 LV ̾ȡƱ VG ¾ LV Ǥ̤Ѥ뤳Ȥ
Ǥޤ


ΥʥꥪϰʲΤ褦ˤʤޤ -

     /------------------------------------------\
     |  /--PV1---\      VG 1      /--PVn---\    |
     |  |-VGDA---|                |-VGDA-- |    |
     |  |PE1PE2..|                |PE1PE2..|    |
     |  |        |     ......     |        |    |
     |  |        |                |        |    |
     |  |    /-----------------------\     |    |
     |  |    \-------LV 1------------/     |    |
     |  |   ..PEn|                |   ..PEn|    |
     |  \--------/                \--------/    |
     \------------------------------------------/

PV 1 ϥ 3GB  /dev/sdc1 Τޤ
PV n ϥ 4GB  /dev/sde1 Τޤ
VG 1  test_vg Τޤ
LV 1  /dev/test_vg/test_lv Τޤ
VGDA  LVM ᥿ǡͭƤܥ塼॰롼׼̻ҥꥢǤ
PE1  PEn ϥǥ (ѡƥ) ʪƥȤֹǤ



󥹥ȡΥƥåפˤĤƤϥե INSTALL 
insmod(1)/modprobe(1) 򡢤⤷ͥ LVM Ȥ߹ǤʤΤǤС
ܥ塼ޥ͡Υ⥸塼ɤ뤿 kmod/kerneld(8)
򤽤줾컲ȤƤ


嵭ΥʥꥪΤΥե졼Υƥåפϰʲ̤Ǥ -

1. /dev/sdc1  /dev/sde1 ΥѡƥΥƥ ID  0x8e
   ꤷޤ

2. "pvcreate /dev/sd[ce]1" ¹
   ƥȤŪǤСҤȤĤΥǥ 2 İʾΥѡƥ
   Ѥ뤳ȤǤޤ̾ϡȥ饤פ줿 LV 
   ѥեޥ󥹤뤿ᡢҤȤĤΥǥ 2 İʾ
   ѡƥѤ٤ǤϤޤ

3. դĤΥѡƥι̤ "test_vg" Ȥ̾ο VG
   뤿ᡢ"vgcreate test_vg /dev/sd[ce]1" ¹Ԥ롣
   vgcreate ϡΥƥåפ LV Ǥ褦ˤ뤿ᡢ
   ܥ塼॰롼פˤĤƤ⥢ƥ֤ˤޤ (ͥ LVM
   ɥ饤˥᥿ǡžޤ)

4. "test_lv" Ȥ̾ 1500MB Υ˥ LV 뤿
   "lvcreate -L1500 -ntest_lv test_vg" ¹Ԥޤ֥åǥХ
   ڥե̾ "/dev/test_vg/test_lv"

5. 㤨 "mke2fs /dev/test_vg/test_lv" ȤҤȤĤ LV 
   ե륷ƥޥȤޤ

6. Ūʥλˤä /dev/test_vg/test_lv  1600MB ޤǳĥˤ
   "lvextend -L+100 /dev/test_vg/test_lv"
   ޤŪʥλǤ
   "lvextend -L1600 /dev/test_vg/test_lv"
   Ȥʤޤ

7. Ūʥλˤä /dev/test_vg/test_lv  900MB ޤǽ̾ˤ
   "lvreduce -l-700 /dev/test_vg/test_lv"
   ޤŪʥλǤ
   "lvreduce -l900 /dev/test_vg/test_lv"
   Ȥʤޤ
 
8. VG ̵̾ѹԤˤ
   "vgchange -an test_vg"   # ץ *Ƥʤ* VG Τ̵ǽ
   "vgrename test_vg whatever"
   
   "vgchange -ay whatever"
   Ȥƺ٥ƥ֤ˤޤ

9. LV 򥯥̾ѹԤˤ
   "lvchange -an /dev/whatever/test_lv" # 줿 LV Τ̵ǽ
   "lvrename  /dev/whatever/test_lv  /dev/whatever/whatvolume"
   ޤ
   "lvrename  whatever test_lv whatvolume"
   
   "lvchange -ay /dev/whatever/whatvolume"
   Ȥƺ٥ƥ֤ˤޤ

10. Ted Tso ޤ Powerquest Ҥ resize2fs äƤΤǤС
    "e2fsadm -L+100 /dev/test_vg/another_test_lv"
    ˤäƥǡ˲뤳Ȥʤ LV ¸ߤ ext2 Υե륷ƥ
    ꥵ뤳ȤǤޤ

======================================================================
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:   <inoue@mxg.nes.nec.co.jp>
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       ŵ <zap03216@nifty.ne.jp>
