Re: [ceph-users] Filestore -> Bluestore

[Vadim Bulst]

Thanks Sergey.








Cheers,

Vadim


I would say the handling of devices
On 11.06.2018 23:58, Sergey Malinin wrote:

Could you specify your answer a bit more? When I look into the manpage of ceph-volume I couldn't find an option named "--destroy". I just like to make clear - this script has already migrated several servers. The problem is appearing when it should migrate devices in the expansion shelf. "-->  RuntimeError: Cannot use device (/dev/dm-0). A vg/lv path or an existing device is needed"

“Device or resource busy” error rises when no “--destroy” option is passed to ceph-volume. On Jun 11, 2018, 22:44 +0300, Vadim Bulst <vadim.bu...@uni-leipzig.de>, wrote:

Dear Cephers,

I'm trying to migrate our OSDs to Bluestore using this little script:

#!/bin/bash
HOSTNAME=$(hostname -s)
OSDS=`ceph osd metadata | jq -c '[.[] | select(.osd_objectstore |
contains("filestore")) ]' | jq '[.[] | select(.hostname |
contains("'${HOSTNAME}'")) ]' | jq '.[].id'`
IFS=' ' read -a OSDARRAY <<<$OSDS
for OSD in "${OSDARRAY[@]}"; do
  DEV=/dev/`ceph osd metadata | jq -c '.[] | select(.id=='${OSD}') |
.backend_filestore_dev_node' | sed 's/"//g'`
  echo "=== Migrating OSD nr ${OSD} on device ${DEV} ==="
  ceph osd out ${OSD}
    while ! ceph osd safe-to-destroy ${OSD} ; do echo "waiting for full
evacuation"; sleep 60 ; done
      systemctl stop ceph-osd@${OSD}
      umount /var/lib/ceph/osd/ceph-${OSD}
      /usr/sbin/ceph-volume lvm zap ${DEV}
      ceph osd destroy ${OSD} --yes-i-really-mean-it
      /usr/sbin/ceph-volume lvm create --bluestore --data ${DEV}
--osd-id ${OSD}
done

Unfortunately - under normal circumstances this works flawlessly. In our


/usr/sbin/ceph-volume lvm zap ${DEV}  is breaking with an error:

OSD(s) 1 are safe to destroy without reducing data durability.
--> Zapping: /dev/dm-0
Running command: /sbin/cryptsetup status /dev/mapper/
 stdout: /dev/mapper/ is inactive.
Running command: wipefs --all /dev/dm-0
 stderr: wipefs: error: /dev/dm-0: probing initialization failed:
Device or resource busy
-->  RuntimeError: command returned non-zero exit status: 1
destroyed osd.1
Running command: /usr/bin/ceph-authtool --gen-print-key
Running command: /usr/bin/ceph --cluster ceph --name
client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring
osd tree -f json
Running command: /usr/bin/ceph --cluster ceph --name
client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring
-i - osd new 74f6ff02-d027-4fc6-9b93-3a96d753
5c8f 1
--> Was unable to complete a new OSD, will rollback changes
--> OSD will be destroyed, keeping the ID because it was provided with
--osd-id
Running command: ceph osd destroy osd.1 --yes-i-really-mean-it
 stderr: destroyed osd.1

-->  RuntimeError: Cannot use device (/dev/dm-0). A vg/lv path or an
existing device is needed


Does anybody know how to solve this problem?

Cheers,

Vadim

--
Vadim Bulst

Universität Leipzig / URZ
04109 Leipzig, Augustusplatz 10

phone: +49-341-97-33380 <tel:+49-341-97-33380>
mail: vadim.bu...@uni-leipzig.de

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case we have expansion shelfs connected as multipath devices to our nodes.

--
Vadim Bulst

Universität Leipzig / URZ
04109  Leipzig, Augustusplatz 10

phone: ++49-341-97-33380
mail:    vadim.bu...@uni-leipzig.de

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