33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
---
|
||
layout: post
|
||
title: "mount: device or resource busy after enabling multipath"
|
||
date: 2013-02-19T23:09:05Z
|
||
tags: [linux, heartbeat-cluster]
|
||
permalink: /blog/2013/2/19/mount-device-or-resource-busy-after-enabling-multipath
|
||
published: true
|
||
author:
|
||
name: Gergely Polonkai
|
||
email: gergely@polonkai.eu
|
||
---
|
||
|
||
We have a heartbeat cluster with two nodes. It has been running for several
|
||
months without problems. The shared storage is on an IBM DS3400, on which we
|
||
have a large volume formatted with ext4.
|
||
|
||
Today I decided to reboot the active node for security reasons. So I’ve
|
||
switched to the passive node, which failed at the first step: it was unable to
|
||
mount the storage (`/dev/sda1`). After whining for a few moments, I tried to
|
||
mount it by hand, which told me
|
||
|
||
/dev/sda1 already mounted or /data is busy
|
||
|
||
I’ve quickly made sure that none of that was true. After checking
|
||
this-and-that, it turned out that the passive node had `multipathd` running, so
|
||
I looked under `/dev/mapper`, and found two symlinks there, `<long-long WWN>`
|
||
and `<long-long WWN>-part1`. As the partition table and the disk size was the
|
||
same as on `/dev/sda`, I tried to
|
||
|
||
mount /dev/<long-long WWN>-part1 /data
|
||
|
||
and voilà! It worked like charm!
|