LVM Volume Group Quiesce/Resume

Characteristics of quiesced LVM volume groups

 The physical volumes in the volume group remain unchanged until the volume

group is resumed.

 Logical volumes may be opened or closed by applications while the volume

group is quiesced.

 Depending upon the quiesce mode specified, application reads and writes or just

application writes are quiesced. The corresponding I/O operations are queued

and will complete after the volume group is resumed. When application reads

are allowed, reading from the volume group returns the last data written before

the volume group was quiesced.

 While the volume group is quiescing, any pending I/O operations already

processed by LVM and on its way to the disks will be completed normally, once

these I/O operations complete the volume group enters a quiesced state.

 Displaying volume group configuration or status information using the

vgdisplay, lvdisplay or lvlnboot commands is allowed when the volume group is

quiesced. The vgdisplay and lvdisplay commands indicate the quiesce mode.

 LVM mirror resynchronization commands and configuration commands are

rejected when the volume group is quiesced. The only operational command

allowed when the volume group is quiesced is the vgchange command to resume

the volume group. A volume group that is quiesced must be resumed before the

volume group can be deactivated.

 A volume group remains quiesced until it is resumed, but the volume group does

not remain quiesced across system reboots. If the system reboots while the

volume group is quiesced, the volume group will not be quiesced the next time

the volume group is activated.