[ceph-users] Filestore to Bluestore migration question

Hayashida, Mami mami.hayashida at uky.edu
Wed Nov 7 07:29:25 PST 2018


Yes, that was indeed a copy-and-paste mistake.  I am trying to use /dev/sdh
(hdd) for data and a part of /dev/sda (ssd)  for the journal.  That's how
the Filestore is set-up.  So, for the Bluestore, data on /dev/sdh,  wal and
db on /dev/sda.


On Wed, Nov 7, 2018 at 10:26 AM, Ashley Merrick <singapore at amerrick.co.uk>
wrote:

> ceph osd destroy 70  --yes-i-really-mean-it
>
> I am guessing that’s a copy and paste mistake and should say 120.
>
> Is the SSD @ /dev/sdh fully for the OSD120 is a partition on this SSD the
> journal and other partitions are for other SSD’s?
>
> On Wed, 7 Nov 2018 at 11:21 PM, Hayashida, Mami <mami.hayashida at uky.edu>
> wrote:
>
>> I would agree with that.  So, here is what I am planning on doing today.
>> I will try this from scratch on a different OSD node from the very first
>> step and log input and output for every step.  Here is the outline of what
>> I think (based on all the email exchanges so far) should happen.
>>
>> *******
>> Trying to convert osd.120 to Bluestore.  Data is on /sda/sdh.   Filestore
>> Journal is on a partition drive (40GB) on /dev/sda.
>>
>> #Mark those OSDs out
>> ceph osd out 120
>>
>> # Stop the OSDs
>> systemctl kill ceph-osd at 120
>>
>> # Unmount the filesystem
>> sudo umount /var/lib/ceph/osd/ceph-120
>>
>> # Destroy the data
>> ceph-volume lvm zap /dev/sdh --destroy   # data disk
>> ceph-volume lvm zap /dev/sda --destroy   # ssd for wal and db
>>
>> # Inform the cluster
>> ceph osd destroy 70  --yes-i-really-mean-it
>>
>> # Check all the /etc/fstab and /etc/systemd/system to make sure that all
>> the references to the filesystem is gone. Run
>> ln -sf /dev/null /etc/systemd/system/ceph-disk at 70.service
>>
>> # Create PVs, VGs, LVs
>> pvcreate /dev/sda # for wal and db
>> pvcreate /dev/sdh # for data
>>
>> vgcreate ssd0 /dev/sda
>> vgcreate hdd120  /dev/sdh
>>
>> lvcreate -L 40G -n db120 ssd0
>> lvcreate -l 100%VG data120 hdd120
>>
>> # Run ceph-volume
>> ceph-volume lvm prepare --bluestore --data hdd120/data120 --block.db
>> ssd0/db120  --osd-id 120
>>
>> # Activate
>> ceph-volume lvm activate 120 <osd fsid>
>>
>> ******
>> Does this sound right?
>>
>> On Tue, Nov 6, 2018 at 4:32 PM, Alfredo Deza <adeza at redhat.com> wrote:
>>
>>> It is pretty difficult to know what step you are missing if we are
>>> getting the `activate --all` command.
>>>
>>> Maybe if you try one by one, capturing each command, throughout the
>>> process, with output. In the filestore-to-bluestore guides we never
>>> advertise `activate --all` for example.
>>>
>>> Something is missing here, and I can't tell what it is.
>>> On Tue, Nov 6, 2018 at 4:13 PM Hayashida, Mami <mami.hayashida at uky.edu>
>>> wrote:
>>> >
>>> > This is becoming even more confusing. I got rid of those ceph-disk at 6[0-9].service
>>> (which had been symlinked to /dev/null).  Moved
>>> /var/lib/ceph/osd/ceph-6[0-9] to  /var/...../osd_old/.  Then, I ran
>>> `ceph-volume lvm activate --all`.  I got once again
>>> >
>>> > root at osd1:~# ceph-volume lvm activate --all
>>> > --> Activating OSD ID 67 FSID 17cd6755-76f9-4160-906c-1bf13d09fb3d
>>> > Running command: mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-67
>>> > --> Absolute path not found for executable: restorecon
>>> > --> Ensure $PATH environment variable contains common executable
>>> locations
>>> > Running command: ceph-bluestore-tool --cluster=ceph prime-osd-dir
>>> --dev /dev/hdd67/data67 --path /var/lib/ceph/osd/ceph-67
>>> >  stderr: failed to read label for /dev/hdd67/data67: (2) No such file
>>> or directory
>>> > -->  RuntimeError: command returned non-zero exit status: 1
>>> >
>>> > But when I ran `df` and `mount` ceph-67 is the only one that exists.
>>> (and in  /var/lib/ceph/osd/)
>>> >
>>> > root at osd1:~# df -h | grep ceph-6
>>> > tmpfs           126G     0  126G   0% /var/lib/ceph/osd/ceph-67
>>> >
>>> > root at osd1:~# mount | grep ceph-6
>>> > tmpfs on /var/lib/ceph/osd/ceph-67 type tmpfs (rw,relatime)
>>> >
>>> > root at osd1:~# ls /var/lib/ceph/osd/ | grep ceph-6
>>> > ceph-67
>>> >
>>> > But in I cannot restart any of these 10 daemons (`systemctl start
>>> ceph-osd at 6[0-9]`).
>>> >
>>> > I am wondering if I should zap these 10 osds and start over although
>>> at this point I am afraid even zapping may not be a simple task....
>>> >
>>> >
>>> >
>>> > On Tue, Nov 6, 2018 at 3:44 PM, Hector Martin <hector at marcansoft.com>
>>> wrote:
>>> >>
>>> >> On 11/7/18 5:27 AM, Hayashida, Mami wrote:
>>> >> > 1. Stopped osd.60-69:  no problem
>>> >> > 2. Skipped this and went to #3 to check first
>>> >> > 3. Here, `find /etc/systemd/system | grep ceph-volume` returned
>>> >> > nothing.  I see in that directory
>>> >> >
>>> >> > /etc/systemd/system/ceph-disk at 60.service    # and 61 - 69.
>>> >> >
>>> >> > No ceph-volume entries.
>>> >>
>>> >> Get rid of those, they also shouldn't be there. Then `systemctl
>>> >> daemon-reload` and continue, see if you get into a good state.
>>> basically
>>> >> feel free to nuke anything in there related to OSD 60-69, since
>>> whatever
>>> >> is needed should be taken care of by the ceph-volume activation.
>>> >>
>>> >>
>>> >> --
>>> >> Hector Martin (hector at marcansoft.com)
>>> >> Public Key: https://mrcn.st/pub
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > Mami Hayashida
>>> > Research Computing Associate
>>> >
>>> > Research Computing Infrastructure
>>> > University of Kentucky Information Technology Services
>>> > 301 Rose Street
>>> <https://maps.google.com/?q=301+Rose+Street&entry=gmail&source=g> | 102
>>> James F. Hardymon Building
>>> > Lexington, KY 40506-0495
>>> > mami.hayashida at uky.edu
>>> > (859)323-7521
>>>
>>
>>
>>
>> --
>> *Mami Hayashida*
>>
>> *Research Computing Associate*
>> Research Computing Infrastructure
>> University of Kentucky Information Technology Services
>> 301 Rose Street
>> <https://maps.google.com/?q=301+Rose+Street&entry=gmail&source=g> | 102
>> James F. Hardymon Building
>> Lexington, KY 40506-0495
>> mami.hayashida at uky.edu
>> (859)323-7521
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users at lists.ceph.com
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>


-- 
*Mami Hayashida*

*Research Computing Associate*
Research Computing Infrastructure
University of Kentucky Information Technology Services
301 Rose Street | 102 James F. Hardymon Building
Lexington, KY 40506-0495
mami.hayashida at uky.edu
(859)323-7521
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