# xtrabackup 8.0 prepare error

**URL:** <https://forums.percona.com/t/xtrabackup-8-0-prepare-error/6872>\
**Category:** Percona XtraBackup\
**Created:** [February 27, 2019, 11:09am UTC](https://forums.percona.com/t/xtrabackup-8-0-prepare-error/6872 "2019-02-27T11:09:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cberg](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@cberg](https://forums.percona.com/u/cberg)\
**Post date:** [February 27, 2019, 11:09am UTC](https://forums.percona.com/t/xtrabackup-8-0-prepare-error/6872/1 "2019-02-27T11:09:36Z")

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Hello; I’m doing some comparative research between Oracle MySQL products, and Percona. I’m trying to build a test cluster, and having problems running a prepare against a backup created with xtrabackup. The version info is below:  
tool\_version = 8.0.4  
ibbackup\_version = 8.0.4  
server\_version = 8.0.13-4

The backup completes fine. Running the prepare returns this error stack:  
Unable to lock ./xtrabackup\_logfile error: 5  
Operating system error number 5 in a file operation.  
Error number 5 means ‘Input/output error’

Not sure if this matters, the backup target-dir is a NFS mount.

Thanks for any help with this.