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From: cd <cd@terminal.space>
To: "linux-lvm@redhat.com" <linux-lvm@redhat.com>
Subject: [linux-lvm] Creating/restoring snapshots in early userspace
Date: Sun, 07 Aug 2022 20:38:42 +0000	[thread overview]
Message-ID: <37yG0UFnzHTZ7-GIuAOuBTpDHSZJcVJ4ptbi_8EqOtSEECEfjYVz6XXafSGqH7Xh2NeCgynDhaXOdwakzIZp4WN-nGyyXmky3nZu2IP-5Jg=@terminal.space> (raw)

Hello,

I have created some scripts which runs in the initramfs during the boot process. Very specifically, it's an initcpio runtime hook https://man.archlinux.org/man/mkinitcpio.8#ABOUT_RUNTIME_HOOKS
Question: Is this a supported environment which to create/restore snapshots?

When my script runs lvm lvconvert --merge testvg/lvmautosnap-root-1659902622-good
it appears to succeed (exit code is 0, and the restore appears to work properly). However, the following warnings appear in stderr as part of the restore process:

/usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to unmonitor testvg/lvmautosnap-root-1659902622-good.
/usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to unmonitor testvg/lvmautosnap-root-1659902707-pending-2.
/usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to monitor testvg/lvmautosnap-root-1659902707-pending-2.
Merging of volume testvg/lvmautosnap-root-1659902622-good started.
/run/lvm/lvmpolld.socket: connect failed: No such file or directory
WARNING: Failed to connect to lvmpolld. Proceeding with polling without using lvmpolld.
WARNING: Check global/use_lvmpolld in lvm.conf or the lvmpolld daemon state.
testvg/root: Merged: 97.92%
testvg/root: Merged: 100.00%
Merge of snapshot into logical volume testvg/root has finished.
/usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to unmonitor testvg/lvmautosnap-root-1659902707-pending-2.
/usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to monitor testvg/lvmautosnap-root-1659902707-pending-2.
Logical volume "lvmautosnap-root-1659902622-good" successfully removed.

And I get similar errors when trying to create new volumes with lvm lvcreate --permission=r --snapshot --monitor n --name my_snapshot
 /usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to unmonitor testvg/lvmautosnap-root-1659902707-pending-2.
Logical volume "lvmautosnap-root-1659903385-pending" created.'
+ lvm_handle_error 0 '  /usr/bin/dmeventd: stat failed: No such file or directory
WARNING: Failed to unmonitor testvg/lvmautosnap-root-1659902707-pending-2.
Logical volume "lvmautosnap-root-1659903385-pending" created

I have noticed the --monitor n option exists for lvcreate, and that does seem to cut down on the error messages. However, trying to use the --driverloaded n flag always fails,
with a message like "Failed to find logical volume".

In summary, I'm happy to just ignore the warning messages. I just want to make sure I'm not risking the integrity of the lvm volumes by modifying them during this part of the boot process.

Kindly,
Anil Kulkarni

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             reply	other threads:[~2022-08-07 20:46 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-07 20:38 cd [this message]
2022-08-08 10:57 ` [linux-lvm] Creating/restoring snapshots in early userspace Zdenek Kabelac
2022-08-08 18:14   ` cd
2022-08-08 19:17     ` Zdenek Kabelac

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