On Thu, Mar 19, 2020 at 6:19 AM Eugen Block <eblock@xxxxxx> wrote:
>
> Hi,
>
> one workaround would be to create a protected snapshot on the primary
> image which is also mirrored, and then clone that snapshot on the
> remote site. That clone can be accessed as required.
+1. This is the correct approach. If you are using a Mimic+ cluster
(i.e. require OSD release >= Mimic), you can use skip the protect
step.
> I'm not sure if there's a way to directly access the remote image
> since it's read-only.
>
> Regards,
> Eugen
>
>
> Zitat von Ml Ml <mliebherr99@xxxxxxxxxxxxxx>:
>
> > Hello,
> >
> > my goal is to back up a proxmox cluster with rbd-mirror for desaster
> > recovery. Promoting/Demoting, etc.. works great.
> >
> > But how can i access a single file on the mirrored cluster? I tried:
> >
> > root@ceph01:~# rbd-nbd --read-only map cluster5-rbd/vm-114-disk-1
> > --cluster backup
> > /dev/nbd1
> >
> > But i get:
> > root@ceph01:~# fdisk -l /dev/nbd1
> > fdisk: cannot open /dev/nbd1: Input/output error
> >
> > dmesg shows stuff like:
> > [Thu Mar 19 09:29:55 2020] nbd1: unable to read partition table
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> >
> > Here is my state:
> >
> > root@ceph01:~# rbd --cluster backup mirror pool status
cluster5-rbd --verbose
> > health: OK
> > images: 3 total
> > 3 replaying
> >
> > vm-106-disk-0:
> > global_id: 0bc18ee1-1749-4787-a45d-01c7e946ff06
> > state: up+replaying
> > description: replaying, master_position=[object_number=3, tag_tid=2,
> > entry_tid=3], mirror_position=[object_number=3, tag_tid=2,
> > entry_tid=3], entries_behind_master=0
> > last_update: 2020-03-19 09:29:17
> >
> > vm-114-disk-1:
> > global_id: 2219ffa9-a4e0-4f89-b352-ff30b1ffe9b9
> > state: up+replaying
> > description: replaying, master_position=[object_number=390,
> > tag_tid=6, entry_tid=334290], mirror_position=[object_number=382,
> > tag_tid=6, entry_tid=328526], entries_behind_master=5764
> > last_update: 2020-03-19 09:29:17
> >
> > vm-115-disk-0:
> > global_id: 2b0af493-14c1-4b10-b557-84928dc37dd1
> > state: up+replaying
> > description: replaying, master_position=[object_number=72,
> > tag_tid=1, entry_tid=67796], mirror_position=[object_number=72,
> > tag_tid=1, entry_tid=67796], entries_behind_master=0
> > last_update: 2020-03-19 09:29:17
> >
> > More dmesg stuff:
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:29:55 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: 95 callbacks suppressed
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 0
> > [Thu Mar 19 09:30:02 2020] buffer_io_error: 94 callbacks suppressed
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 0, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 1
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 1, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 2
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 2, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 3
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 3, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 4
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 4, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 5
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 5, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 6
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 6, async page read
> > [Thu Mar 19 09:30:02 2020] block nbd1: Other side returned error (30)
> > [Thu Mar 19 09:30:02 2020] blk_update_request: I/O error, dev
nbd1, sector 7
> > [Thu Mar 19 09:30:02 2020] Buffer I/O error on dev nbd1, logical block
> > 7, async page read
> >
> > Do i have to stop the replaying or how can i mount the image on the
> > backup cluster?
> >
> > Thanks,
> > Michael
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>
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--
Jason
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