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Hi Maged,
The problem you met beacuse of the left over of
older cluster.Did you remove the db partition or you just use the old
partition?
I thought Wido suggest to remove the partition
then use the dd to be safe.Is it safe I don't remove the partition and just
use dd the try to destory the data on that partition?
How would ceph-disk or ceph-volume do to the
existing partition of journal,db,wal?Will it clean it or it just uses it
without any action?
发件人：Maged Mokhtar <mmokhtar@xxxxxxxxxxx>
发送时间：2018-02-01 14:22
主题：Re: [ceph-users] How to clean data of osd with ssd
journal(wal, db if it is bluestore) ?
收件人："David Turner"<drakonstein@xxxxxxxxx>
抄送："shadow_lin"<shadow_lin@xxxxxxx>,"ceph-users"<ceph-users@xxxxxxxxxxxxxx>
I would recommend as Wido to use the dd command. block db device holds the
metada/allocation of objects stored in data block, not cleaning this is asking
for problems, besides it does not take any time. In our testing building
new custer on top of older installation, we did see many cases where osds will
not start and report an error such as fsid of cluster and/or OSD does not
match metada in BlueFS superblock...these errors do not appear if we use the
dd command.
On 2018-02-01 06:06, David Turner wrote:
I know that for filestore journals that is fine. I think it
is also safe for bluestore. Doing Wido's recommendation of writing
100MB would be a good idea, but not necessary.
Hi David,
Thanks for your reply.
I am wondering what if I don't remove the
journal(wal,db for bluestore) partion on the ssd and only zap the data
disk.Then I assign the journal(wal,db for bluestore) partion to a new
osd.What would happen?
发送时间：2018-01-31 17:24
主题：Re: [ceph-users] How to clean data of osd with
ssd journal(wal, db if it is bluestore) ?
I use gdisk to remove the partition and partprobe for the OS
to see the new partition table. You can script it with sgdisk.
Hi list,
if I create an osd with
journal(wal,db if it is bluestore) in the same hdd, I use
ceph-disk zap to clean the disk when I want to remove the
osd and clean the data on the disk.
But if I use a ssd partition as the
journal(wal,db if it is bluestore) , how should I clean the journal
(wal,db if it is bluestore) of the osd I want to remove?Especially
when there are other osds are using other partition of the same
ssd as journals(wal,db if it is bluestore) .
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