记一次linux pv missing故障 |
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现象描述： linux一个逻辑卷lv_home丢失，无法正常挂载，之前挂载在/home目录下: [root@VM001 ~]# cat /etc/fstab ....... /dev/VolGroup/lv_home /home ext4 defaults 0 0查看文件系统挂载情况，发现lv_home并没有挂载： [root@VM001 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 20G 7.3G 12G 40% / tmpfs 3.9G 224K 3.9G 1% /dev/shm /dev/xvda1 477M 124M 328M 28% /boot尝试手动挂载发现找不到lv_home这个逻辑卷： [root@VM0001 ~]# mount /dev/VolGroup/lv_ lv_root lv_swap [root@VM001 ~]# cd /dev/VolGroup/ [root@VM000000875 VolGroup]# ls lv_root lv_swap [root@VM001 VolGroup]# ll total 0 lrwxrwxrwx. 1 root root 7 Jul 31 11:06 lv_root -> ../dm-0 lrwxrwxrwx. 1 root root 7 Jul 31 11:06 lv_swap -> ../dm-1查看逻辑卷状态，发现处于异常状态(NOT available)： [root@VM001 VolGroup]# lvdisplay ....... --- Logical volume --- LV Path /dev/VolGroup/lv_home LV Name lv_home VG Name VolGroup LV UUID 4rdajn-62q9-RX5T-QorD-vLsh-hMEv-zxT1Qj LV Write Access read/write LV Creation host, time localhost.localdomain, 2016-03-17 09:19:33 +0800 LV Status NOT available LV Size 1.17 TiB Current LE 306815 Segments 3 Allocation inherit Read ahead sectors auto [root@VM001 VolGroup]# lvscan ACTIVE '/dev/VolGroup/lv_root' [20.00 GiB] inherit ACTIVE '/dev/VolGroup/lv_swap' [5.00 GiB] inherit inactive '/dev/VolGroup/lv_home' [1.17 TiB] inherit问题排查： 执行vgdisplay -v命令有2个pv missing信息，此处为关键报错信息： [root@VM001 ~]# vgdisplay -v Using volume group(s) on command line. Finding all volume groups. Wiping cache of LVM-capable devices There are 2 physical volumes missing. There are 2 physical volumes missing. --- Volume group --- VG Name VolGroup System ID Format lvm2 Metadata Areas 4 ...........查看pv状态： [root@VM001 ~]# pvs PV VG Fmt Attr PSize PFree /dev/xvda2 VolGroup lvm2 a-m 49.51g 0 /dev/xvda3 VolGroup lvm2 a-m 973.99g 0 /dev/xvde VolGroup lvm2 a-- 200.00g 0 /dev/xvdf1 VolGroup lvm2 a-- 1023.99g 1023.99g查看pvs参数说明： # man pvs ....... NOTES The pv_attr bits are: 1 (d)uplicate, (a)llocatable, (u)sed 2 e(x)ported 3 (m)issing可以确认/dev/xvda2和/dev/xvda3两个物理卷状态为missing(a-m). 问题解决： 用vgextend - -restoremissing命令成功恢复pv到正常状态： man vgextend有如下说明： # man vgextend ....... DESCRIPTION vgextend adds one or more PVs to a VG. This increases the space available for LVs in the VG. Also, PVs that have gone missing and then returned, e.g. due to a transient device failure, can be added back to the VG without re-initializing them (see --restoremissing). ....... - -restoremissing Add a PV back into a VG after the PV was missing and then returned, e.g. due to a transient failure. The PV is not reinitialized # 在PV丢失后再将PV添加到VG中，然后返回，例如由于瞬时故障。没有重新初始化PV。命令格式： # vgextend VG PV执行命令： # vgextend --restoremissing VolGroup /dev/xvda2 # vgextend --restoremissing VolGroup /dev/xvda3执行完成以后查看pv状态，已经恢复正常： [root@VM001 ~]# pvs PV VG Fmt Attr PSize PFree /dev/xvda2 VolGroup lvm2 a-- 49.51g 0 /dev/xvda3 VolGroup lvm2 a-- 973.99g 0 /dev/xvde VolGroup lvm2 a-- 200.00g 0 /dev/xvdf1 VolGroup lvm2 a-- 1023.99g 1023.99g再查看lv状态，也恢复正常，能够正常挂载并进行扩容： [root@VM001 ~]# vgdisplay -v Using volume group(s) on command line. Finding all volume groups. --- Volume group --- VG Name VolGroup System ID ............ --- Logical volume --- LV Path /dev/VolGroup/lv_home LV Name lv_home VG Name VolGroup LV UUID 4rdajn-62q9-RX5T-QorD-vLsh-hMEv-zxT1Qj LV Write Access read/write LV Creation host, time localhost.localdomain, 2016-03-17 09:19:33 +0800 LV Status available # open 1 LV Size 2.15 TiB Current LE 562815 Segments 4 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2手动执行挂载，此时lv_home逻辑卷挂载恢复正常： [root@VM001 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 20G 7.3G 12G 40% / tmpfs 3.9G 224K 3.9G 1% /dev/shm /dev/xvda1 477M 124M 328M 28% /boot /dev/mapper/VolGroup-lv_home 2.2T 1.2T 876G 58% /home网上看到的其他类似问题： 案例1： 执行lvextend -l +100%FREE /dev/VolGroup00/LogVol00的时候，出现了如下错误: Device still marked missing because of allocated data on it, remove volumes and consider bgreduce --removemissing.在查阅许多资料之后，发现可以使用restoremissing 参数来恢复 [root@Caron ~]# vgextend --restoremissing VolGroup00 /dev/sdh1再次执行lvextend命令的时候，提示成功。重新resize一下lvm大小： [root@Caron ~]# resize2fs /dev/VolGroup00/LogVol00 [root@Caron ~]# df -h | more Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 936G 612G 283G 69% / devtmpfs 126G 0 126G 0% /dev tmpfs 126G 0 126G 0% /dev/shm tmpfs 126G 4.1G 122G 4% /run tmpfs 126G 0 126G 0% /sys/fs/cgroup /dev/sda1 283M 100M 164M 38% /boot tmpfs 126G 4.1G 122G 4% /run/netns tmpfs 26G 0 26G 0% /run/user/0案例2: 1.PV丢失的故障处理，手工创建逻辑卷失败，报错显示有PV丢失： [root@node29archive]# lvcreate -L 1G -n testlv vgcloud Cannotchange VG vgcloud while PVs are missing. Considervgreduce --removemissing.2.进一步查看： [root@node29archive]# pvs PV VG Fmt Attr PSize PFree /dev/mapper/mpathbp1 vgcloud lvm2 a-- 1.82t 89.40g /dev/mapper/mpathbp2 vgcloud lvm2 a-- 1.82t 91.14g /dev/mapper/mpathbp3 vgcloud lvm2 a-- 1.82t 30.14g /dev/mapper/mpathbp4 vgcloud lvm2 a-- 1.64t 30.00g /dev/mapper/mpathcp1 vgcloud lvm2 a-m 1.82t 84.14g /dev/mapper/mpathcp2 vgcloud lvm2 a-m 1.82t 117.14g /dev/mapper/mpathcp3 vgcloud lvm2 a-m 1.82t 1.33t /dev/mapper/mpathcp4 vgcloud lvm2 a-- 1.81t 1.81t [root@node29archive]# vgs VG #PV #LV #SN Attr VSize VFree vgcloud 8 126 0 wz-pn- 14.36t 3.58t其中发现有三个逻辑卷处于missing的状态 3.经过查找资料得知可以使用vgextend –restoremissing操作解决 [root@node26tmp]# vgextend --restoremissing vgcloud /dev/mapper/mpathcp1 Volume group "vgcloud" successfullyextended [root@node26tmp]# vgextend --restoremissing vgcloud /dev/mapper/mpathcp2 Volume group "vgcloud" successfullyextended [root@node26tmp]# vgextend --restoremissing vgcloud /dev/mapper/mpathcp3 Volume group "vgcloud" successfullyextended4.再看已经没有missing状态标示了,手工创建逻辑卷 [root@node29archive]# lvcreate -L 1G -n testlv vgcloud Logical volume "testlv" created |
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