2014-06-26 16:48:13 +00:00
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---
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layout: post
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title: "mount: device or resource busy after enabling multipath"
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2016-02-26 15:26:26 +00:00
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date: 2013-02-19 23:09:05
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2014-06-26 16:48:13 +00:00
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tags: [linux, heartbeat-cluster]
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permalink: /blog/2013/2/19/mount-device-or-resource-busy-after-enabling-multipath
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published: true
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author:
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name: Gergely Polonkai
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email: gergely@polonkai.eu
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---
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We have a heartbeat cluster with two nodes. It has been running for several
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months without problems. The shared storage is on an IBM DS3400, on which we
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have a large volume formatted with ext4.
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Today I decided to reboot the active node for security reasons. So I’ve
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switched to the passive node, which failed at the first step: it was unable to
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mount the storage (`/dev/sda1`). After whining for a few moments, I tried to
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mount it by hand, which told me
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/dev/sda1 already mounted or /data is busy
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I’ve quickly made sure that none of that was true. After checking
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this-and-that, it turned out that the passive node had `multipathd` running, so
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I looked under `/dev/mapper`, and found two symlinks there, `<long-long WWN>`
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and `<long-long WWN>-part1`. As the partition table and the disk size was the
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same as on `/dev/sda`, I tried to
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mount /dev/<long-long WWN>-part1 /data
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and voilà! It worked like charm!
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