Storage fails to activate or mount automatically during boot?_unable to activate storage-优快云博客

本文介绍了解决Red Hat Enterprise Linux中存储设备在启动时未能自动激活或挂载的问题。通过在fstab文件中添加_netdev选项，并启用netfs服务，可以确保在网络服务启动后正确激活和挂载存储设备。

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SOLUTION 已验证 - 已更新 2014年十月23日14:14 -

English

环境

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

问题

Storage fails to activate or mount automatically during boot

Raw

# lvs -o +devices
  LV          VG                 Attr   LSize   Devices                       
  lv_one      vg_one    -wi-ao  20.00G /dev/mpath/mpath1(0)    
  lv_two      vg_two    -wi-ao 385.00G /dev/mpath/mpath2(0)   
  lv_three    vg_three  -wi-ao 250.00G /dev/mpath/mpath3(0)
  lv_four     vg_four   -wi--- 250.00G /dev/mpath/mpath4(0)    
  lv_five     vg_five   -wi---  20.00G /dev/mpath/mpath5(0)

Raw

# grep vg_one /etc/fstab
/dev/vg_one/lv_one    /data    ext3    defaults    0 0
# mount | grep vg_one -c
0

决议

1) Add the _netdev option to the fstab options column for this device

Raw

/dev/vg_one/lv_one    /data    ext3    defaults,_netdev    0 0

2) Enable the netfs service

Raw

# chkconfig netfs on

In additional, some application or database use lv directly (raw device), it means this device's vg doesn't have file system, in this situation, the method above still work. For example:

Raw

/dev/vg_test/lv_test    /data    ext4    defaults,_netdev    0 0

lv "/dev/vg_test/lv_test" do not need to be existed, it mean you do not need to create file system or create lv purposely. Only make sure vg name is correct, after os boot, vg "vg_test" will be activated. But it will have file system mount failed message during os boot:

Raw

Setting up Logical Volume Management: 1 logical volume(s) in volume group "vg_test" now active      [OK]
Checking network-attached filesystems
Mounting filesystems:  mount: special device /dev/vg_test/lv_test does not exist      [FAILED]

根源

The storage needs more time to become ready on the host
For iSCSI storage, the operation of activating vg defined in script file "/etc/rc.sysinit" was done before network service starting.
While the _netdev mount option was created for network connected devices, it can be used to introduce a delay before running another activation and mount
The _netdev options calls the /etc/init.d/netfs script, which by default starts after networking.
The netfs script calls another vgchange and mount for this device, allowing activation and mounting