# Xtrabackup and the read lock ( --stream + many no ibd files )

**URL:** <https://forums.percona.com/t/xtrabackup-and-the-read-lock-stream-many-no-ibd-files/4010>\
**Category:** Percona XtraBackup\
**Created:** [January 26, 2015, 4:45am UTC](https://forums.percona.com/t/xtrabackup-and-the-read-lock-stream-many-no-ibd-files/4010 "2015-01-26T04:45:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rockandska](https://avatars.discourse-cdn.com/v4/letter/r/f04885/32.png) [@rockandska](https://forums.percona.com/u/rockandska)\
**Post date:** [January 26, 2015, 4:45am UTC](https://forums.percona.com/t/xtrabackup-and-the-read-lock-stream-many-no-ibd-files/4010/1 "2015-01-26T04:45:04Z")

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Hi Percona’s Community,

First, thanks for all your incredible works , informations and tools.

Today I’m facing a problem than i had in the past to rebuild my slave and i’m looking for an advice to avoid the huge read lock than i’ve had ( ~ 1h on the master, ouch ! )

It’s a huge server with about 2TB of data ( ~9416 databases , ~400000 tables for 922433 files =\> 556414 are not ibd files )

I can’t make a local backup and can’t use the rsync option

Is there a solution to avoid this read lock or reduce it ? ( it seems not )

After reading the documentation, could you ensure me than the step who does the read lock happen after than the ibd files was copied ? ( last step ? )

Is there someone who tested the patch submit by Michael Kefeder [here](https://bugs.launchpad.net/percona-xtrabackup/+bug/1350236) ? It seems than this patch could help in this kind of situation

Thanks for your advice,

Best regards,