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---
layout: post
title: "mount: device or resource busy after enabling multipath"
date: 2013-02-19 23:09:05
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 Ive
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
Ive 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!