13 Jul
2023
13 Jul
'23
4:15 p.m.
Hi,
How RBD mirror tracks mirroring process, on local storage?
Say, RBD mirror is running on host-1, when host-1 goes down,
start RBD mirror on host-2. In that case, is RBD mirror on host-2
going to continue the mirroring?
Thanks!
Tony
13 Jul
13 Jul
8:23 p.m.
New subject: [ceph-users] resume RBD mirror on another host
On Thu, Jul 13, 2023 at 6:16 PM Tony Liu <tonyliu0592(a)hotmail.com> wrote:
Hi,
How RBD mirror tracks mirroring process, on local storage?
Say, RBD mirror is running on host-1, when host-1 goes down,
start RBD mirror on host-2. In that case, is RBD mirror on host-2
going to continue the mirroring?
Hi Tony,
No, it's tracked on the RBD image itself -- meaning in RADOS.
With journal-based mirroring it's the commit position in the journal
(roughly).
For snapshot-based mirroring, there is last_copied_object_number field
on each mirror snapshot.
Thanks,
Ilya
8:30 p.m.
New subject: [ceph-users] resume RBD mirror on another host
On Thu, Jul 13, 2023 at 10:23 PM Ilya Dryomov <idryomov(a)gmail.com> wrote:
On Thu, Jul 13, 2023 at 6:16 PM Tony Liu <tonyliu0592(a)hotmail.com> wrote:
To be clear, "no" here was meant to answer the "How RBD mirror
tracks mirroring process, on local storage?" question.
To answer the second question explicitly: yes, rbd-mirror daemon on
host-2 will continue mirroring from where rbd-mirror daemon on host-1
left off.
Thanks,
Ilya
Hi,
How RBD mirror tracks mirroring process, on local storage?
Say, RBD mirror is running on host-1, when host-1 goes down,
start RBD mirror on host-2. In that case, is RBD mirror on host-2
going to continue the mirroring?
Hi Tony,
No, it's tracked on the RBD image itself -- meaning in RADOS.
9:13 p.m.
New subject: [ceph-users] resume RBD mirror on another host
Super! Thanks Ilya!
Tony
________________________________________
From: Ilya Dryomov <idryomov(a)gmail.com>
Sent: July 13, 2023 01:30 PM
To: Tony Liu
Cc: dev(a)ceph.io; ceph-users(a)ceph.io
Subject: Re: [ceph-users] resume RBD mirror on another host
On Thu, Jul 13, 2023 at 10:23 PM Ilya Dryomov <idryomov(a)gmail.com> wrote:
On Thu, Jul 13, 2023 at 6:16 PM Tony Liu <tonyliu0592(a)hotmail.com> wrote:
To be clear, "no" here was meant to answer the "How RBD mirror
tracks mirroring process, on local storage?" question.
To answer the second question explicitly: yes, rbd-mirror daemon on
host-2 will continue mirroring from where rbd-mirror daemon on host-1
left off.
Thanks,
Ilya
Hi,
How RBD mirror tracks mirroring process, on local storage?
Say, RBD mirror is running on host-1, when host-1 goes down,
start RBD mirror on host-2. In that case, is RBD mirror on host-2
going to continue the mirroring?
Hi Tony,
No, it's tracked on the RBD image itself -- meaning in RADOS.
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participants (2)
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Ilya Dryomov -
Tony Liu