Re: ceph-dis prepare : UUID=00000000-0000-0000-0000-000000000000

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-----Message d'origine-----
De : Loic Dachary [mailto:loic@xxxxxxxxxxx] 

The failure 

journal check: ondisk fsid 00000000-0000-0000-0000-000000000000 doesn't match expected 244973de-7472-421c-bb25-4b09d3f8d441

and the udev logs

DEBUG:ceph-disk:Journal /dev/sdc2 has OSD UUID 00000000-0000-0000-0000-000000000000

means /usr/bin/ceph-osd -i 0 --get-journal-uuid --osd-journal /dev/sdc2

fails to read the OSD UUID from /dev/sdc2 which means something went wrong when preparing the journal.

It would be great if you could send the command you used to prepare the disk and the output (verbose if possible). I think you can reproduce the problem by zapping the disk with ceph-disk zap /dev/sdc and running partx -u if the corresponding entries in /dev/disk/by-partuuid have not been removed. That would also help me fix zap in the context of https://github.com/ceph/ceph/pull/2648 ... or have confirmation that it does not need fixing because it updates correctly on RHEL ;-)

Cheers

-- 
Loïc Dachary, Artisan Logiciel Libre

[>- FS : -<] 
Hi Loic,

At first, some notes :
-  I noticed I have to wait at least 1sec before I run partx -u on a prepared disk, otherwise even with that disks won't get properly handled by udev.
Maybe some caching somewhere ?
- the '-u' option does not seem to exist under RHEL6... so maybe the RHEL6 behaviour was just to include the kernel updating in the -a option, and not anymore ?
- this is CentOS 7, i.e RHEL like, but not "pure" RHEL7 even if very close.


I Zapped the disk (it seems to work as expected) : 
[root@ceph1 ~]# ll /dev/disk/by-partuuid/
total 0
lrwxrwxrwx 1 root root 10 Oct  9 15:57 668f92f5-df46-4052-92ba-e8b8f7efd2d9 -> ../../sdb1
lrwxrwxrwx 1 root root 10 Oct  9 15:57 feb09ba1-30a2-44a8-a338-fef39ae6626a -> ../../sdb2
[root@ceph1 ~]

partx -u :

[root@ceph1 ~]# partx -u /dev/sdc
partx: specified range <1:0> does not make sense


Right after that, I re-prepared the disk :

[root@ceph1 ~]# parted -s /dev/sdc mklabel gpt
[root@ceph1 ~]# ceph-disk -v  prepare /dev/sdc
INFO:ceph-disk:Running command: /usr/bin/ceph-osd --cluster=ceph --show-config-value=fsid
INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_mkfs_type
INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_fs_type
INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_mkfs_options_xfs
INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_fs_mkfs_options_xfs
INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_mount_options_xfs
INFO:ceph-disk:Running command: /usr/bin/ceph-conf --cluster=ceph --name=osd. --lookup osd_fs_mount_options_xfs
INFO:ceph-disk:Running command: /usr/bin/ceph-osd --cluster=ceph --show-config-value=osd_journal_size
INFO:ceph-disk:Will colocate journal with data on /dev/sdc
DEBUG:ceph-disk:Creating journal partition num 2 size 5120 on /dev/sdc
INFO:ceph-disk:Running command: /usr/sbin/sgdisk --new=2:0:5120M --change-name=2:ceph journal --partition-guid=2:46bf261f-7ec3-485e-98c9-3c185de5efb8 --typecode=2:45b0969e-9b03-4f30-b4c6-b4b80ceff106 --mbrtogpt -- /dev/sdc
Information: Moved requested sector from 34 to 2048 in
order to align on 2048-sector boundaries.
The operation has completed successfully.
INFO:ceph-disk:calling partx on prepared device /dev/sdc
INFO:ceph-disk:re-reading known partitions will display errors
INFO:ceph-disk:Running command: /usr/sbin/partx -a /dev/sdc
partx: /dev/sdc: error adding partition 2
INFO:ceph-disk:Running command: /usr/bin/udevadm settle
DEBUG:ceph-disk:Journal is GPT partition /dev/disk/by-partuuid/46bf261f-7ec3-485e-98c9-3c185de5efb8
DEBUG:ceph-disk:Creating osd partition on /dev/sdc
INFO:ceph-disk:Running command: /usr/sbin/sgdisk --largest-new=1 --change-name=1:ceph data --partition-guid=1:436ac41b-8800-466e-98f5-098aa2c64ba9 --typecode=1:89c57f98-2fe5-4dc0-89c1-f3ad0ceff2be -- /dev/sdc
Information: Moved requested sector from 10485761 to 10487808 in
order to align on 2048-sector boundaries.
The operation has completed successfully.
INFO:ceph-disk:Running command: /usr/sbin/partprobe /dev/sdc
INFO:ceph-disk:Running command: /usr/bin/udevadm settle
DEBUG:ceph-disk:Creating xfs fs on /dev/sdc1
INFO:ceph-disk:Running command: /usr/sbin/mkfs -t xfs -f -i size=2048 -- /dev/sdc1
meta-data=/dev/sdc1              isize=2048   agcount=4, agsize=60686271 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0
data     =                       bsize=4096   blocks=242745083, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal log           bsize=4096   blocks=118527, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
DEBUG:ceph-disk:Mounting /dev/sdc1 on /var/lib/ceph/tmp/mnt.Jtg9rD with options noatime
INFO:ceph-disk:Running command: /usr/bin/mount -t xfs -o noatime -- /dev/sdc1 /var/lib/ceph/tmp/mnt.Jtg9rD
DEBUG:ceph-disk:Preparing osd data dir /var/lib/ceph/tmp/mnt.Jtg9rD
DEBUG:ceph-disk:Creating symlink /var/lib/ceph/tmp/mnt.Jtg9rD/journal -> /dev/disk/by-partuuid/46bf261f-7ec3-485e-98c9-3c185de5efb8
DEBUG:ceph-disk:Unmounting /var/lib/ceph/tmp/mnt.Jtg9rD
INFO:ceph-disk:Running command: /bin/umount -- /var/lib/ceph/tmp/mnt.Jtg9rD
INFO:ceph-disk:Running command: /usr/sbin/sgdisk --typecode=1:4fbd7e29-9d25-41b8-afd0-062c0ceff05d -- /dev/sdc
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.
INFO:ceph-disk:calling partx on prepared device /dev/sdc
INFO:ceph-disk:re-reading known partitions will display errors
INFO:ceph-disk:Running command: /usr/sbin/partx -a /dev/sdc
partx: /dev/sdc: error adding partitions 1-2


And it remained prepared/unmounted :

[root@ceph1 ~]# ceph-disk list|grep sdc
WARNING:ceph-disk:Old blkid does not support ID_PART_ENTRY_* fields, trying sgdisk; may not correctly identify ceph volumes with dmcrypt
/dev/sdc :
 /dev/sdc1 ceph data, prepared, cluster ceph, journal /dev/sdc2
 /dev/sdc2 ceph journal, for /dev/sdc1



If I mount the sdc1 partition I see this :
[root@ceph1 ~]# ll /mnt/
total 16
-rw-r--r-- 1 root root 37 Oct 10 10:49 ceph_fsid
-rw-r--r-- 1 root root 37 Oct 10 10:49 fsid
lrwxrwxrwx 1 root root 58 Oct 10 10:49 journal -> /dev/disk/by-partuuid/46bf261f-7ec3-485e-98c9-3c185de5efb8
-rw-r--r-- 1 root root 37 Oct 10 10:49 journal_uuid
-rw-r--r-- 1 root root 21 Oct 10 10:49 magic
[root@ceph1 ~]# cat /mnt/journal_uuid
46bf261f-7ec3-485e-98c9-3c185de5efb8



And this is the content of /dev/by-partuuid :
[root@ceph1 ~]# ll /dev/disk/by-partuuid/
total 0
lrwxrwxrwx 1 root root 10 Oct 10 10:49 436ac41b-8800-466e-98f5-098aa2c64ba9 -> ../../sdc1
lrwxrwxrwx 1 root root 10 Oct 10 10:49 46bf261f-7ec3-485e-98c9-3c185de5efb8 -> ../../sdc2
lrwxrwxrwx 1 root root 10 Oct  9 15:57 668f92f5-df46-4052-92ba-e8b8f7efd2d9 -> ../../sdb1
lrwxrwxrwx 1 root root 10 Oct  9 15:57 feb09ba1-30a2-44a8-a338-fef39ae6626a -> ../../sdb2


Regards
Frederic
[>- FS : -<] 

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