CentOS6.5下lv调整空间大小
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CentOS6.5下lv调整空间大小
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[root@CentOS-78?/]#?df?-h?? Filesystem????????????Size??Used?Avail?Use%?Mounted?on?? /dev/mapper/vg_centos-lv_root?? ???????????????????????50G???14G???34G??30%?/?? tmpfs?????????????????1.9G?????0??1.9G???0%?/dev/shm?? /dev/sda1?????????????485M???37M??423M???8%?/boot?? /dev/mapper/vg_centos-lv_home?? ??????????????????????404G??670M??382G???1%?/home??
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root50G 14G 34G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
/dev/mapper/vg_centos-lv_home404G 670M 382G 1% /home
下面的詳細(xì)步驟部分將從vg_centos-lv_home分區(qū)下取出100G的空間添加到/vg_centos-lv_root分區(qū)上去。
[root@CentOS-78?/]#?umount?/home??
[root@CentOS-78 /]# umount /home此時(shí)在用df命令查看將會(huì)發(fā)現(xiàn)/home目錄已經(jīng)看不見了，如下所示：
[plain] view plaincopyprint?[root@CentOS-78?/]#?df?-h?? Filesystem????????????Size??Used?Avail?Use%?Mounted?on?? /dev/mapper/vg_centos-lv_root?? ???????????????????????50G???14G???34G??30%?/?? tmpfs?????????????????1.9G?????0??1.9G???0%?/dev/shm?? /dev/sda1?????????????485M???37M??423M???8%?/boot??
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root50G 14G 34G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
[root@CentOS-78?/]#?resize2fs?-p?/dev/mapper/vg_centos-lv_home?282G?? resize2fs?1.41.12?(17-May-2010)?? Please?run?'e2fsck?-f?/dev/mapper/vg_centos-lv_home'?first.??
[root@CentOS-78 /]# resize2fs -p /dev/mapper/vg_centos-lv_home 282G
resize2fs 1.41.12 (17-May-2010)
Please run 'e2fsck -f /dev/mapper/vg_centos-lv_home' first.這一步設(shè)定vg_home-lv_home大小沒有成功，系統(tǒng)提示我們先運(yùn)行下面的命令，操作如下：
[plain] view plaincopyprint?[root@CentOS-78?/]#?e2fsck?-f?/dev/mapper/vg_centos-lv_home?? e2fsck?1.41.12?(17-May-2010)?? Pass?1:?Checking?inodes,?blocks,?and?sizes?? Pass?2:?Checking?directory?structure?? Pass?3:?Checking?directory?connectivity?? Pass?4:?Checking?reference?counts?? Pass?5:?Checking?group?summary?information?? /dev/mapper/vg_centos-lv_home:?1386/26836992?files?(0.9%?non-contiguous),?1855856/107344896?blocks??
[root@CentOS-78 /]# e2fsck -f /dev/mapper/vg_centos-lv_home
e2fsck 1.41.12 (17-May-2010)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/mapper/vg_centos-lv_home: 1386/26836992 files (0.9% non-contiguous), 1855856/107344896 blocks從新設(shè)定vg_home-lv_home的大小：
[plain] view plaincopyprint?[root@CentOS-78?/]#?resize2fs?-p?/dev/mapper/vg_centos-lv_home?282G?? resize2fs?1.41.12?(17-May-2010)?? Resizing?the?filesystem?on?/dev/mapper/vg_centos-lv_home?to?73924608?(4k)?blocks.?? Begin?pass?2?(max?=?43)?? Relocating?blocks?????????????XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX?? Begin?pass?3?(max?=?3276)?? Scanning?inode?table??????????XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX?? Begin?pass?4?(max?=?266)?? Updating?inode?references?????XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX?? The?filesystem?on?/dev/mapper/vg_centos-lv_home?is?now?73924608?blocks?long.??
[root@CentOS-78 /]# resize2fs -p /dev/mapper/vg_centos-lv_home 282G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/vg_centos-lv_home to 73924608 (4k) blocks.
Begin pass 2 (max = 43)
Relocating blocks XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 3276)
Scanning inode table XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 4 (max = 266)
Updating inode references XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/vg_centos-lv_home is now 73924608 blocks long.檢查是否成功：
[plain] view plaincopyprint?[root@CentOS-78?/]#?mount?/home?? [root@CentOS-78?/]#?? [root@CentOS-78?/]#?df?-h?? Filesystem????????????Size??Used?Avail?Use%?Mounted?on?? /dev/mapper/vg_centos-lv_root?? ???????????????????????50G???14G???34G??30%?/?? tmpfs?????????????????1.9G?????0??1.9G???0%?/dev/shm?? /dev/sda1?????????????485M???37M??423M???8%?/boot?? /dev/mapper/vg_centos-lv_home?? ??????????????????????278G??663M??263G???1%?/home?? [root@CentOS-78?/]#??
[root@CentOS-78 /]# mount /home
[root@CentOS-78 /]#
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root50G 14G 34G 30% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
/dev/mapper/vg_centos-lv_home278G 663M 263G 1% /home
[root@CentOS-78 /]#3、將lv_home邏輯分區(qū)減小到指定大小
[plain] view plaincopyprint?[root@CentOS-78?/]#?lvreduce?-L?282G?/dev/mapper/vg_centos-lv_home?? ??WARNING:?Reducing?active?and?open?logical?volume?to?282.00?GiB?? ??THIS?MAY?DESTROY?YOUR?DATA?(filesystem?etc.)?? Do?you?really?want?to?reduce?lv_home??[y/n]:?y?? ??Reducing?logical?volume?lv_home?to?282.00?GiB?? ??Logical?volume?lv_home?successfully?resized?? [root@CentOS-78?/]#??
[root@CentOS-78 /]# lvreduce -L 282G /dev/mapper/vg_centos-lv_homeWARNING: Reducing active and open logical volume to 282.00 GiBTHIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_home? [y/n]: yReducing logical volume lv_home to 282.00 GiBLogical volume lv_home successfully resized
[root@CentOS-78 /]#我認(rèn)為這個(gè)命令是將已經(jīng)減少的100G空間拿到系統(tǒng)公共的區(qū)域，可以被其他分區(qū)加載和利用。
[root@CentOS-78?/]#?vgdisplay?? ??---?Volume?group?---?? ??VG?Name???????????????vg_centos?? ??System?ID?? ??Format????????????????lvm2?? ??Metadata?Areas????????1?? ??Metadata?Sequence?No??5?? ??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???????????????465.27?GiB?? ??PE?Size???????????????4.00?MiB?? ??Total?PE??????????????119109?? ??Alloc?PE?/?Size???????86472?/?337.78?GiB?? ??Free??PE?/?Size???????32637?/?127.49?GiB?? ??VG?UUID???????????????1k4ooN-RFV9-uyf1-uMYf-aERG-YaGs-ZNoSD6??
[root@CentOS-78 /]# vgdisplay--- Volume group ---VG Name vg_centosSystem IDFormat lvm2Metadata Areas 1Metadata Sequence No 5VG Access read/writeVG Status resizableMAX LV 0Cur LV 3Open LV 3Max PV 0Cur PV 1Act PV 1VG Size 465.27 GiBPE Size 4.00 MiBTotal PE 119109Alloc PE / Size 86472 / 337.78 GiBFree PE / Size 32637 / 127.49 GiBVG UUID 1k4ooN-RFV9-uyf1-uMYf-aERG-YaGs-ZNoSD6
[root@CentOS-78?/]#?lvextend?-L?+127.40G?/dev/mapper/vg_centos-lv_root?? ??Rounding?up?size?to?full?physical?extent?127.40?GiB?? ??Extending?logical?volume?lv_root?to?177.40?GiB?? ??Logical?volume?lv_root?successfully?resized?? [root@CentOS-78?/]#??
[root@CentOS-78 /]# lvextend -L +127.40G /dev/mapper/vg_centos-lv_rootRounding up size to full physical extent 127.40 GiBExtending logical volume lv_root to 177.40 GiBLogical volume lv_root successfully resized
[root@CentOS-78 /]#從新設(shè)定該分區(qū)的大小：
[plain] view plaincopyprint?[root@CentOS-78?/]#?resize2fs?-p?/dev/mapper/vg_centos-lv_root?? resize2fs?1.41.12?(17-May-2010)?? Filesystem?at?/dev/mapper/vg_centos-lv_root?is?mounted?on?/;?on-line?resizing?required?? old?desc_blocks?=?4,?new_desc_blocks?=?12?? Performing?an?on-line?resize?of?/dev/mapper/vg_centos-lv_root?to?46504960?(4k)?blocks.?? The?filesystem?on?/dev/mapper/vg_centos-lv_root?is?now?46504960?blocks?long.??
[root@CentOS-78 /]# resize2fs -p /dev/mapper/vg_centos-lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/vg_centos-lv_root is mounted on /; on-line resizing required
old desc_blocks = 4, new_desc_blocks = 12
Performing an on-line resize of /dev/mapper/vg_centos-lv_root to 46504960 (4k) blocks.
The filesystem on /dev/mapper/vg_centos-lv_root is now 46504960 blocks long.5、再次查看分區(qū)大小
[plain] view plaincopyprint?[root@CentOS-78?/]#?df?-h?? Filesystem????????????Size??Used?Avail?Use%?Mounted?on?? /dev/mapper/vg_centos-lv_root?? ??????????????????????175G???14G??153G???9%?/?? tmpfs?????????????????1.9G?????0??1.9G???0%?/dev/shm?? /dev/sda1?????????????485M???37M??423M???8%?/boot?? /dev/mapper/vg_centos-lv_home?? ??????????????????????278G??663M??263G???1%?/home??
[root@CentOS-78 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos-lv_root175G 14G 153G 9% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/sda1 485M 37M 423M 8% /boot
/dev/mapper/vg_centos-lv_home278G 663M 263G 1% /home我們發(fā)現(xiàn)vg_centos-lv_root分區(qū)的空間已經(jīng)增加了125G，之所以比lv_home減少的空間要多25G主要是由于我們把系統(tǒng)所有的可用的空間都加在了lv_root分區(qū)。
[root@CentOS-78?/]#?fuser?-m?/home?? [root@CentOS-78?/]#??
[root@CentOS-78 /]# fuser -m /home
[root@CentOS-78 /]#2、設(shè)定完lv_home的大小，再次mount該分區(qū)時(shí)，發(fā)現(xiàn)用df命令無法看到給分區(qū)，此時(shí)只要在mount一次即可
轉(zhuǎn)自：http://blog.csdn.net/andy_yf/article/details/7831482
一、目的
在使用CentOS6.3版本linux系統(tǒng)的時(shí)候，發(fā)現(xiàn)根目錄(/)的空間不是很充足，而其他目錄空間有很大的空閑，所以本文主要是針對(duì)現(xiàn)在已有的空間進(jìn)行調(diào)整。首先，先來查看一下系統(tǒng)的空間分配情況：
[plain] view plaincopyprint?二、詳細(xì)步驟
1、卸載vg_centos-lv_home分區(qū)
[plain] view plaincopyprint?2、從新設(shè)定vg_home-lv_home的大小
[plain] view plaincopyprint?查詢卷組的信息：
[plain] view plaincopyprint?Free PE / Size指定的應(yīng)該是現(xiàn)在可在分配的空間。
4、增加vg_centos-lv_root分區(qū)的大小將可用的空間添加到vg_centos-lv_root分區(qū)上面：
[plain] view plaincopyprint?[plain] view plaincopyprint?
三、所遇到的問題
1、在卸載/home目錄的時(shí)候失敗
可先執(zhí)行如下fuser命令，然后再umount即可：
[plain] view plaincopyprint?3、在設(shè)定lv_root的大小時(shí)，不要把Free PE / Size的空間全部都用上，這很可能會(huì)出現(xiàn)Free PE空間不足的現(xiàn)象，建議保留一點(diǎn)Free PE的空間。
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參考：
http://hi.baidu.com/%B7%E7%B6%C0/blog/item/c4aa9a81b204dbc89023d956.html
http://qianxunniao.iteye.com/blog/1393726
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