Re: Cluster not healing

[Gambit15 <dougti+gluster@xxxxxxxxx>]

Have you verified that Gluster has marked the files as split-brain?

gluster volume heal <vol> info split-brain

If you're fairly confident about which files are correct, you can automate the split-brain healing procedure.

From the manual...

        volume heal <VOLNAME> split-brain bigger-file <FILE>
              Performs healing of <FILE> which is in split-brain by choosing the bigger file in the replica as source.

        volume heal <VOLNAME> split-brain source-brick <HOSTNAME:BRICKNAME>
              Selects <HOSTNAME:BRICKNAME> as the source for all the files that are in split-brain in that replica and heals them.

        volume heal <VOLNAME> split-brain source-brick <HOSTNAME:BRICKNAME> <FILE>
              Selects the split-brained <FILE> present in <HOSTNAME:BRICKNAME> as source and completes heal.

D

On 23 January 2017 at 16:28, James Wilkins <nebulai@xxxxxxxxx> wrote:

Hello,

I have a couple of gluster clusters - setup with distributed/replicated volumes that have starting incrementing the heal-count from statistics - and for some files returning input/output error when attempting to access said files from a fuse mount.

If i take one volume, from one cluster as an example:

gluster volume heal storage01 statistics info

<snip>

Brick storage02.<redacted>:/storage/sdc/brick_storage01

Number of entries: 595

</snip>

And then proceed to look at one of these files (have found 2 copies - one on each server / brick)

First brick:

# getfattr -m . -d -e hex  /storage/sdc/brick_storage01/projects/183-57c559ea4d60e-canary-test--node02/wordpress285-data/html/wp-content/themes/twentyfourteen/single.php

getfattr: Removing leading '/' from absolute path names

# file: storage/sdc/brick_storage01/projects/183-57c559ea4d60e-canary-test--node02/wordpress285-data/html/wp-content/themes/twentyfourteen/single.php

security.selinux=0x73797374656d5f753a6f626a6563745f723a676c7573746572645f627269636b5f743a733000

trusted.afr.dirty=0x000000000000000000000000

trusted.afr.storage01-client-0=0x000000020000000100000000

trusted.bit-rot.version=0x02000000000000005874e2cd0000459d

trusted.gfid=0xda4253be1c2647b7b6ec5c045d61d216

trusted.glusterfs.quota.c9764826-596a-4886-9bc0-60ee9b3fce44.contri.1=0x00000000000006000000000000000001

trusted.pgfid.c9764826-596a-4886-9bc0-60ee9b3fce44=0x00000001

Second Brick:

# getfattr -m . -d -e hex /storage/sdc/brick_storage01/projects/183-57c559ea4d60e-canary-test--node02/wordpress285-data/html/wp-content/themes/twentyfourteen/single.php

getfattr: Removing leading '/' from absolute path names

# file: storage/sdc/brick_storage01/projects/183-57c559ea4d60e-canary-test--node02/wordpress285-data/html/wp-content/themes/twentyfourteen/single.php

security.selinux=0x73797374656d5f753a6f626a6563745f723a676c7573746572645f627269636b5f743a733000

trusted.afr.dirty=0x000000000000000000000000

trusted.bit-rot.version=0x020000000000000057868423000d6332

trusted.gfid=0x14f74b04679345289dbd3290a3665cbc

trusted.glusterfs.quota.47e007ee-6f91-4187-81f8-90a393deba2b.contri.1=0x00000000000006000000000000000001

trusted.pgfid.47e007ee-6f91-4187-81f8-90a393deba2b=0x00000001

I can see the only the first brick has the appropiate trusted.afr.<client> tag - e.g in this case 

trusted.afr.storage01-client-0=0x000000020000000100000000

Files are same size under stat - just the access/modify/change dates are different.

My first question is - reading https://gluster.readthedocs.io/en/latest/Troubleshooting/split-brain/ this suggests that i should have this field on both copies of the files - or am I mis-reading?

Secondly - am I correct that each one of these entries will require manual fixing?  (I have approx 6K files/directories in this state over two clusters - which appears like an awful lot of manual fixing)

I've checked gluster volume info <vol> and all appropiate services/self-heal daemon are running.  We've even tried a full heal/heal and iterating over parts of the filesystem in question with find / stat / md5sum.

Any input appreciated.

Cheers,

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