22 Aug
2023
22 Aug
'23
2:19 p.m.
Hi,
while writing a response to [1] I tried to convert an existing
directory within a single cephfs into a subvolume. According to [2]
that should be possible, I'm just wondering how to confirm that it
actually worked. Because setting the xattr works fine, the directory
just doesn't show up in the subvolume ls command. This is what I tried
(in Reef and Pacific):
# one "regular" subvolume already exists
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
# mounted / and created new subdir
$ mkdir /mnt/volumes/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/volumes/subvol2
# still only one subvolume
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
I also tried it directly underneath /mnt:
$ mkdir /mnt/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/subvol2
But still no subvolume2 available. What am I missing here?
Thanks
Eugen
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/G4ZWGGUPPFQ…
[2] https://www.spinics.net/lists/ceph-users/msg72341.html
24 Aug
24 Aug
5:59 a.m.
well, you should've used the ceph command to create the subvol
it's much simpler that way
$ ceph fs subvolume create mycephfs subvol2
The above command creates a new subvol (subvol2) in the default subvolume group.
So, in your case the actual path to the subvolume would be
/mnt/volumes/_nogroup/subvol2/<uuid>
On Tue, Aug 22, 2023 at 4:50 PM Eugen Block <eblock(a)nde.ag> wrote:
Hi,
while writing a response to [1] I tried to convert an existing
directory within a single cephfs into a subvolume. According to [2]
that should be possible, I'm just wondering how to confirm that it
actually worked. Because setting the xattr works fine, the directory
just doesn't show up in the subvolume ls command. This is what I tried
(in Reef and Pacific):
# one "regular" subvolume already exists
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
# mounted / and created new subdir
$ mkdir /mnt/volumes/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/volumes/subvol2
# still only one subvolume
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
I also tried it directly underneath /mnt:
$ mkdir /mnt/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/subvol2
But still no subvolume2 available. What am I missing here?
Thanks
Eugen
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/G4ZWGGUPPFQ…
[2] https://www.spinics.net/lists/ceph-users/msg72341.html
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--
Milind
2:40 p.m.
Thanks, I understand that. I was just explicitly asking for the
conversion of an existing directory (created without subvolume) with
xattr as mentioned in the thread [2]. Anyway, apparently it works like
Anh Phan stated in his response, moving an existing directory to the
subvolumegroup subdir makes it a subvolume. So there's no need for
xattr here.
Thanks,
Eugen
Zitat von Milind Changire <mchangir(a)redhat.com>om>:
well, you should've used the ceph command to
create the subvol
it's much simpler that way
$ ceph fs subvolume create mycephfs subvol2
The above command creates a new subvol (subvol2) in the default
subvolume group.
So, in your case the actual path to the subvolume would be
/mnt/volumes/_nogroup/subvol2/<uuid>
On Tue, Aug 22, 2023 at 4:50 PM Eugen Block <eblock(a)nde.ag> wrote:
Hi,
while writing a response to [1] I tried to convert an existing
directory within a single cephfs into a subvolume. According to [2]
that should be possible, I'm just wondering how to confirm that it
actually worked. Because setting the xattr works fine, the directory
just doesn't show up in the subvolume ls command. This is what I tried
(in Reef and Pacific):
# one "regular" subvolume already exists
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
# mounted / and created new subdir
$ mkdir /mnt/volumes/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/volumes/subvol2
# still only one subvolume
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
I also tried it directly underneath /mnt:
$ mkdir /mnt/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/subvol2
But still no subvolume2 available. What am I missing here?
Thanks
Eugen
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/G4ZWGGUPPFQ…
[2] https://www.spinics.net/lists/ceph-users/msg72341.html
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--
Milind
7:47 p.m.
fyi - the xattr is indeed required even if the dir is under a subvolumegroup dir
there's some management involved in the way the subvolume dir is created
On Thu, Aug 24, 2023 at 5:10 PM Eugen Block <eblock(a)nde.ag> wrote:
Thanks, I understand that. I was just explicitly asking for the
conversion of an existing directory (created without subvolume) with
xattr as mentioned in the thread [2]. Anyway, apparently it works like
Anh Phan stated in his response, moving an existing directory to the
subvolumegroup subdir makes it a subvolume. So there's no need for
xattr here.
Thanks,
Eugen
Zitat von Milind Changire <mchangir(a)redhat.com>om>:
--
Milind
well, you should've used the ceph command to
create the subvol
it's much simpler that way
$ ceph fs subvolume create mycephfs subvol2
The above command creates a new subvol (subvol2) in the default
subvolume group.
So, in your case the actual path to the subvolume would be
/mnt/volumes/_nogroup/subvol2/<uuid>
On Tue, Aug 22, 2023 at 4:50 PM Eugen Block <eblock(a)nde.ag> wrote:
Hi,
while writing a response to [1] I tried to convert an existing
directory within a single cephfs into a subvolume. According to [2]
that should be possible, I'm just wondering how to confirm that it
actually worked. Because setting the xattr works fine, the directory
just doesn't show up in the subvolume ls command. This is what I tried
(in Reef and Pacific):
# one "regular" subvolume already exists
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
# mounted / and created new subdir
$ mkdir /mnt/volumes/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/volumes/subvol2
# still only one subvolume
$ ceph fs subvolume ls cephfs
[
{
"name": "subvol1"
}
]
I also tried it directly underneath /mnt:
$ mkdir /mnt/subvol2
$ setfattr -n ceph.dir.subvolume -v 1 /mnt/subvol2
But still no subvolume2 available. What am I missing here?
Thanks
Eugen
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/G4ZWGGUPPFQ…
[2] https://www.spinics.net/lists/ceph-users/msg72341.html
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--
Milind 
10 Oct
10 Oct
10:43 p.m.
Hello,
I'm following this tread and the original. I'm trying to convert directories into
subvolumes. Where I'm stuck is how you move a directory into the subvolume root
directory.
I have a volume 'tank' and it's mounted on the host as '/mnt/tank' I
have subfolders '/mnt/tank/database', '/mnt/tank/gitlab', etc...
I create a subvolume and getpath gives me:
/volumes/_nogroup/database/4a....74
Questions:
1) How do I move /mnt/tank/database into /volumes/_nogroup/database/4a...74
2) Each of the directories have different pools associated with them, do I need to create
the sub volume in the same pool?
3) Or can I just move '/mnt/tank/gitlab' --> /volumes/_nogroup/gitlab without
first creating the volume? This would skip question 2..
Thx!
Jie
11 Oct
11 Oct
9:30 a.m.
Hi,
check out this thread [1] as well, where Anh Phan pointed out:
Not really sure what you want, but for simplicity,
just move folder
to following structure:
/volumes/[Sub Volume Group Name]/[Sub Volume Name]
ceph will recognize it (no extend attr needed), if you use
subvolumegroup name difference than "_nogroup", you must provide it
in all subvolume command [--group_name <subvol_group_name>]
You'll need an existing group (the _nogroup won't work) where you can
move your directory tree to. That worked in my test as expected.
Regards,
Eugen
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/thread/G4ZWGGUPPFQ…
Zitat von jie.zhang7(a)gmail.com:
Hello,
I'm following this tread and the original. I'm trying to convert
directories into subvolumes. Where I'm stuck is how you move a
directory into the subvolume root directory.
I have a volume 'tank' and it's mounted on the host as '/mnt/tank'
I have subfolders '/mnt/tank/database', '/mnt/tank/gitlab', etc...
I create a subvolume and getpath gives me:
/volumes/_nogroup/database/4a....74
Questions:
1) How do I move /mnt/tank/database into /volumes/_nogroup/database/4a...74
2) Each of the directories have different pools associated with
them, do I need to create the sub volume in the same pool?
3) Or can I just move '/mnt/tank/gitlab' -->
/volumes/_nogroup/gitlab without first creating the volume? This
would skip question 2..
Thx!
Jie
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4:19 p.m.
Eugon,
Thank you, however I'm am still lost. I can create a subvolume group, that I
understand. The issue is '/volume/<group>' isn't a real directory on
the host, it's a 'virtual directory' in cephfs. '/mnt/tank/database'
is a real folder structure on the host. I can't `mv /mnt/tank/database
/volume/<group>`
Re-reading the thread, is the answer basically:
1) Create group and subvolume
2) mount the subvolume onto the host and then move the data?
Or is there a more direct way to convert '/mnt/tank/database' to
'/volume/<group>/database'
Thx!
Jie
12 Oct
12 Oct
5:20 p.m.
Hi,
you'll need to have either both mount points mounted on your host or
simply mount the root directory. I don't think there's a different
method available to convert directories to subvolumes.
Zitat von jie.zhang7(a)gmail.com:
Eugon,
Thank you, however I'm am still lost. I can create a subvolume
group, that I understand. The issue is '/volume/<group>' isn't a
real directory on the host, it's a 'virtual directory' in cephfs.
'/mnt/tank/database' is a real folder structure on the host. I
can't `mv /mnt/tank/database /volume/<group>`
Re-reading the thread, is the answer basically:
1) Create group and subvolume
2) mount the subvolume onto the host and then move the data?
Or is there a more direct way to convert '/mnt/tank/database' to
'/volume/<group>/database'
Thx!
Jie
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220
days inactive
271
days old
7 comments
3 participants
participants (3)
-
Eugen Block -
jie.zhang7＠gmail.com -
Milind Changire