Linux swap partition control (swap partition lvm Management)

Linux swap partition control (swap partition lvm Management)
Note: linux swap partitions are managed by lvm. The following method can be used for control. 1. View swap lv [root @ testdb ~] # Vgdisplay-v Finding all volume groups Finding volume group "VolGroup" --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable max lv 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 357.38 GiB PE Size 4.00 MiB Total PE 91489 Alloc PE/Size 34512/134 .81 GiB Free PE/Size 56977/222 .57 GiB vg uuid q6q2 Yf-Isfw-DnkL-JeSN-uTvC-l5m2-M0HEco --- Logical volume --- LV Path/dev/VolGroup/lv_root LV Name lv_root VG Name VolGroup lv uuid volume LV Write Access read/write LV Creation host, time localhost. localdomain, 08:41:58 + 0800 LV Status available # open 1 LV Size 29.30 GiB Current LE 7500 Segments 1 Allocation inherit Read ahead sectors auto-currently set To 256 Block device 252: 0 --- Logical volume --- LV Path/dev/VolGroup/lv_swap LV Name lv_swap VG Name VolGroup lv uuid OJaxbf-MPay-cjep-L44c-UKDx-ZmGW-v24yUf LV Write Access read/write LV Creation host, time localhost. localdomain, 08:42:00 + 0800 LV Status available # open 2 LV Size 7.86 GiB Current LE 2012 Segments 1 Allocation inherit Read ahead sectors auto-currently set to 256 Blo Ck device 252: 1 --- Logical volume --- lvpath/dev/VolGroup/lv_home LV Name lv_home VG Name VolGroup lv uuid HZvOuv-G8NW-2ZyW-3Ffl-H54i-Kmjp-8ndVqo LV Write Access read/write LV Creation host, time localhost. localdomain, 08:42:01 + 0800 LV Status available # open 1 LV Size 97.66 GiB Current LE 25000 Segments 1 Allocation inherit Read ahead sectors auto-currently set to 256 Block devic E 252: 2 --- Physical volumes --- PV Name/dev/sda2 pv uuid gQvj3L-kOPV-LILA-KPnD-a8W9-lgdE-09vtlQ PV Status allocatable Total PE/Free PE 91489/56977 swap partition lv for/dev/VolGroup/lv_swap II. expand swap partition close swap partition [root @ testdb ~] # Swapoff/dev/VolGroup/lv_swap [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 14682 1398 0 83 13680-/+ buffers/cache: 919 15162 Swap: 0 0 0 expansion/dev/VolGroup/lv_swap, add 8336 M [root @ testdb ~] # Lvextend-L + 8336 M/dev/VolGroup/lv_swap Extending logical volume lv_swap to 16.28 GiB Logical volume lv_swap volume resized set/dev/VolGroup/lv_swap to swap partition [root @ testdb ~] # Mkswap/dev/VolGroup/lv_swapmkswap:/dev/VolGroup/lv_swap: warning: don't erase bootbits sectors on whole disk. use-f to force. setting up swapspace version 1, size = 17072124 KiBno label, UUID = f5fa0e85-da9e-440c-8f1c-e3ab978c9d6b [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 14683 1398 0 83 13680-/+ buffers/cache: 918 15162 Swap: 0 0 0 start swap partition [root @ testdb ~] # Swapon/dev/VolGroup/lv_swap [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 14695 1386 0 83 13680-/+ buffers/cache: 931 15150 16671 Swap: 16671 0 III. reduce swap partition close swap partition [root @ testdb ~] # Swapoff/dev/VolGroup/lv_swap [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 15141 940 0 255 13953-/+ buffers/cache: 932 15149 Swap: 0 0 0 decrease/dev/VolGroup/lv_swap 8000 M [root @ testdb ~] # Lvreduce-L-8000 M/dev/VolGroup/lv_swap WARNING: switching active logical volume to 8.47 GiB this may destroy your data (filesystem etc.) Do you really want to reduce lv_swap? [Y/n]: y cing logical volume lv_swap to 8.47 GiB Logical volume lv_swap successfully resized [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 15143 938 0 256 13955-/+ buffers/cache: 931 15149 Swap: 0 0 0 set/dev/VolGroup/lv_swap to swap partition [root @ testdb ~] # Mkswap/dev/VolGroup/lv_swapmkswap:/dev/VolGroup/lv_swap: warning: don't erase bootbits sectors on whole disk. use-f to force. setting up swapspace version 1, size = 8880124 KiBno label, UUID = 1951f318-e2eb-45d5-b1ed-25a2bf87adea [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 15142 938 0 256 13955-/+ buffers/cache: 931 15150 Swap: 0 0 0 enable swap partition [root @ testdb ~] # Swapon/dev/VolGroup/lv_swap [root @ testdb ~] # Free-m total used free shared buffers cachedMem: 16081 15149 932 0 256 13955-/+ buffers/cache: 937 15143 8671 Swap: 8671 0 [root @ testdb ~] #