On Sun, Aug 6, 2017 at 4:42 AM, Jim Kusznir <jim@palousetech.com> wrote:

Well, after a very stressful weekend, I think I have things largely working.  Turns out that most of the above issues were caused by the linux permissions of the exports for all three volumes (they had been reset to 600; setting them to 774 or 770 fixed many of the issues).  Of course, I didn't find that until a much more harrowing outage, and hours and hours of work, including beginning to look at rebuilding my cluster....

So, now my cluster is operating again, and everything looks good EXCEPT for one major Gluster issue/question that I haven't found any references or info on.

my host ovirt2, one of the replica gluster servers, is the one that lost its storage and had to reinitialize it from the cluster.  the iso volume is perfectly fine and complete, but the engine and data volumes are smaller on disk on this node than on the other node (and this node before the crash).  On the engine store, the entire cluster reports the smaller utilization on mounted gluster filesystems; on the data partition, it reports the larger size (rest of cluster).  Here's some df statments to help clarify:

(brick1 = engine; brick2=data, brick4=iso):

Filesystem                     Size  Used Avail Use% Mounted on

/dev/mapper/gluster-engine      25G   12G   14G  47% /gluster/brick1

/dev/mapper/gluster-data       136G  125G   12G  92% /gluster/brick2

/dev/mapper/gluster-iso         25G  7.3G   18G  29% /gluster/brick4

192.168.8.11:/engine            15G  9.7G  5.4G  65% /rhev/data-center/mnt/glusterSD/192.168.8.11:_engine

192.168.8.11:/data             136G  125G   12G  92% /rhev/data-center/mnt/glusterSD/192.168.8.11:_data

192.168.8.11:/iso               13G  7.3G  5.8G  56% /rhev/data-center/mnt/glusterSD/192.168.8.11:_iso

View from ovirt2:

Filesystem                     Size  Used Avail Use% Mounted on

/dev/mapper/gluster-engine      15G  9.7G  5.4G  65% /gluster/brick1

/dev/mapper/gluster-data       174G  119G   56G  69% /gluster/brick2

/dev/mapper/gluster-iso         13G  7.3G  5.8G  56% /gluster/brick4

192.168.8.11:/engine            15G  9.7G  5.4G  65% /rhev/data-center/mnt/glusterSD/192.168.8.11:_engine

192.168.8.11:/data             136G  125G   12G  92% /rhev/data-center/mnt/glusterSD/192.168.8.11:_data

192.168.8.11:/iso               13G  7.3G  5.8G  56% /rhev/data-center/mnt/glusterSD/192.168.8.11:_iso

As you can see, in the process of rebuilding the hard drive for ovirt2, I did resize some things to give more space to data, where I desperately need it.  If this goes well and the storage is given a clean bill of health at this time, then I will take ovirt1 down and resize to match ovirt2, and thus score a decent increase in storage for data.  I fully realize that right now the gluster mounted volumes should have the total size as the least common denominator.

So, is this size reduction appropriate?  A big part of me thinks data is missing, but I even went through and shut down ovirt2's gluster daemons, wiped all the gluster data, and restarted gluster to allow it a fresh heal attempt, and it again came back to the exact same size.  This cluster was originally built about the time ovirt 4.0 came out, and has been upgraded to 'current', so perhaps some new gluster features are making more efficient use of space (dedupe or something)?

The used capacity should be consistent on all nodes - I see you have a discrepancy with the data volume brick. What does "gluster vol heal data info" tell you? Are there entries to be healed?

Can you provide the glustershd logs?

 

Thank  you for your assistance!

--JIm

On Fri, Aug 4, 2017 at 7:49 PM, Jim Kusznir <jim@palousetech.com> wrote:

Hi all:

Today has been rough.  two of my three nodes went down today, and self heal has not been healing well.  4 hours later, VMs are running.  but the engine is not happy.  It claims the storage domain is down (even though it is up on all hosts and VMs are running).  I'm getting a ton of these messages logging:

VDSM engine3 command HSMGetAllTasksStatusesVDS failed: Not SPM

Aug 4, 2017 7:23:00 PM

VDSM engine3 command SpmStatusVDS failed: Error validating master storage domain: ('MD read error',)

Aug 4, 2017 7:22:49 PM

VDSM engine3 command ConnectStoragePoolVDS failed: Cannot find master domain: u'spUUID=5868392a-0148-02cf-014d-000000000121, msdUUID=cdaf180c-fde6-4cb3-b6e5-b6bd869c8770'

Aug 4, 2017 7:22:47 PM

VDSM engine1 command ConnectStoragePoolVDS failed: Cannot find master domain: u'spUUID=5868392a-0148-02cf-014d-000000000121, msdUUID=cdaf180c-fde6-4cb3-b6e5-b6bd869c8770'

Aug 4, 2017 7:22:46 PM

VDSM engine2 command SpmStatusVDS failed: Error validating master storage domain: ('MD read error',)

Aug 4, 2017 7:22:44 PM

VDSM engine2 command ConnectStoragePoolVDS failed: Cannot find master domain: u'spUUID=5868392a-0148-02cf-014d-000000000121, msdUUID=cdaf180c-fde6-4cb3-b6e5-b6bd869c8770'

Aug 4, 2017 7:22:42 PM

VDSM engine1 command HSMGetAllTasksStatusesVDS failed: Not SPM: ()

------------

I cannot set an SPM as it claims the storage domain is down; I cannot set the storage domain up.

Also in the storage realm, one of my exports shows substantially less data than is actually there.

Here's what happened, as best as I understood them:

I went to do maintence on ovirt2 (needed to replace a faulty ram stick and rework the disk).  I put it in maintence mode, then shut it down and did my work.  In the process, much of the disk contents was lost (all the gluster data).  I figure, no big deal, the gluster data is redundant on the network, it will heal when it comes back up.

While I was doing maintence, all but one of the VMs were running on engine1.  When I turned on engine2, all of the sudden, all vms including the main engine stop and go non-responsive.  As far as I can tell, this should not have happened, as I turned ON one host, but none the less, I waited for recovery to occur (while customers started calling asking why everything stopped working....).  As I waited, I  was checking, and gluster volume status only showed ovirt1 and ovirt2....Apparently gluster had stopped/failed at some point on ovirt3.  I assume that was the cause of the outage, still, if everything was working fine with ovirt1 gluster, and ovirt2 powers on with a very broke gluster (the volume status was showing NA for the port fileds for the gluster volumes), I would not expect to have a working gluster go stupid like that.

After starting ovirt3 glusterd and checking the status, all three showed ovirt1 and ovirt3 as operational, and ovirt2 as NA.  Unfortunately, recovery was still not happening, so I did some googling and found about the commands to inquire about the hosted-engine status.  It appeared to be stuck "paused" and I couldn't find a way to unpause it, so I poweroff'ed it, then started it manually on engine 1, and the cluster came back up.  It showed all VMs paused.  I was able to unpause them and they worked again.  

So now I began to work the ovirt2 gluster healing problem.  It didn't appear to be self-healing, but eventually I found this document:

https://support.rackspace.com/how-to/recover-from-a-failed-server-in-a-glusterfs-array/

and from that found the magic xattr commands.  After setting them, gluster volumes on ovirt2 came online.  I told iso to heal, and it did but only came up about half as much data as it should have.  I told it heal full, and it did finish off the remaining data, and came up to full.  I then told engine to do a full heal (gluster volume heal engine full), and it transferred its data from the other gluster hosts too.  However, it said it was done when it hit 9.7GB while there was 15GB on disk!  It is still stuck that way; ovirt gui and gluster volume heal engine info both show the volume fully healed, but it is not:

[root@ovirt1 ~]# df -h

Filesystem                     Size  Used Avail Use% Mounted on

/dev/mapper/centos_ovirt-root   20G  4.2G   16G  21% /

devtmpfs                        16G     0   16G   0% /dev

tmpfs                           16G   16K   16G   1% /dev/shm

tmpfs                           16G   26M   16G   1% /run

tmpfs                           16G     0   16G   0% /sys/fs/cgroup

/dev/mapper/gluster-engine      25G   12G   14G  47% /gluster/brick1

/dev/sda1                      497M  315M  183M  64% /boot

/dev/mapper/gluster-data       136G  124G   13G  92% /gluster/brick2

/dev/mapper/gluster-iso         25G  7.3G   18G  29% /gluster/brick4

tmpfs                          3.2G     0  3.2G   0% /run/user/0

192.168.8.11:/engine            15G  9.7G  5.4G  65% /rhev/data-center/mnt/glusterSD/192.168.8.11:_engine

192.168.8.11:/data             136G  124G   13G  92% /rhev/data-center/mnt/glusterSD/192.168.8.11:_data

192.168.8.11:/iso               13G  7.3G  5.8G  56% /rhev/data-center/mnt/glusterSD/192.168.8.11:_iso

This is from ovirt1, and before the work, both ovirt1 and ovirt2's brings had the same usage.  ovirt2's bricks and the gluster mountpoints agree on iso and engine, but as you can see, not here.  If I do a du -sh on /rhev/data-center/mnt/glusterSD/..../_engine, it comes back with the 12GB number (/brick1 is engine, brick2 is data and brick4 is iso).  However, gluster still says its only 9.7G.  I haven't figured out how to get it to finish "healing".

data is in the process of healing currently.

So, I think I have two main things to solve right now:

1) how do I get ovirt to see the data center/storage domain as online again?

2) How do I get engine to finish healing to ovirt2?

Thanks all for reading this very long message!

--Jim

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