Re: Reg thin pool activation failure - transaction id mismatch

On Wed, Sep 18, 2024 at 4:25=E2=80=AFPM Lakshmi Narasimhan Sundararajan
<[email protected]> wrote:
>
> Hi Team,
> Good day all!
>
> In yet another long testing run, I see a thin pool was unable to get
> volume group thin pool activated.
> vgchange -ay <vgname> fails with
>
> ```
> /# vgchange -ay pwx3
> Thin pool pwx3-pxpool-tpool (253:25) transaction_id is 6, while expected =
24.
> Thin pool pwx3-pxpool-tpool (253:25) transaction_id is 6, while expected =
24.
> Thin pool pwx3-pxpool-tpool (253:25) transaction_id is 6, while expected =
24.
> Thin pool pwx3-pxpool-tpool (253:25) transaction_id is 6, while expected =
24.
> 3 logical volume(s) in volume group "pwx3" now active
> ```
> It had other non thin lvols in the vg that got activated successfully.
>
> I tried fixing the pool, by trying the following ``` lvconvert
> --repair pwx3 ``` but this fails to fix the thin pool.

type: this cmd should be "lvconvert --repair pwx3/pxpool" instead
pointing to the thin pool in the vg.


>
> There was last configuration in the lvm config backup location.
> I fixed the transaction id and used `vgcfgrestore --force -f <patched
> config> pwx3` and this fixed the transaction id issue and vg was now
> successfully activated.
>
>
> And my follow up questions are:
> 1/ what exactly is a transaction id mismatch problem?
> A little more detail about this problem will help me understand this bett=
er.
>
> 2/ Are there any known workflows that are known to create this issue?
> So I can be careful to avoid such workflows.
>
> 3/ does recovery as above guarantee data in the pool? or is the pool
> data suspect?
>
> My environment is as below where the problem got seen:
> ```
> # uname -a
> Linux pwx-ocp-240-201-w6d5l-worker-0-zmtns
> 5.14.0-427.28.1.el9_4.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Jul 19
> 14:40:47 EDT 2024 x86_64 x86_64 x86_64 GNU/Linux
> ```
>
> ```
> # lvm version LVM version: 2.03.23(2) (2023-11-21) Library version:
> 1.02.197 (2023-11-21) Driver version: 4.48.0 Configuration:
> ./configure --build=3Dx86_64-redhat-linux-gnu
> --host=3Dx86_64-redhat-linux-gnu --program-prefix=3D
> --disable-dependency-tracking --prefix=3D/usr --exec-prefix=3D/usr
> --bindir=3D/usr/bin --sbindir=3D/usr/sbin --sysconfdir=3D/etc
> --datadir=3D/usr/share --includedir=3D/usr/include --libdir=3D/usr/lib64
> --libexecdir=3D/usr/libexec --localstatedir=3D/var
> --sharedstatedir=3D/var/lib --mandir=3D/usr/share/man
> --infodir=3D/usr/share/info --with-default-dm-run-dir=3D/run
> --with-default-run-dir=3D/run/lvm --with-default-pid-dir=3D/run
> --with-default-locking-dir=3D/run/lock/lvm --with-usrlibdir=3D/usr/lib64
> --enable-fsadm --enable-write_install --with-user=3D --with-group=3D
> --with-device-uid=3D0 --with-device-gid=3D6 --with-device-mode=3D0660
> --enable-pkgconfig --enable-cmdlib --enable-dmeventd
> --enable-blkid_wiping --with-udevdir=3D/usr/lib/udev/rules.d
> --enable-udev_sync --with-thin=3Dinternal --with-cache=3Dinternal
> --enable-lvmpolld --enable-lvmlockd-dlm --enable-lvmlockd-dlmcontrol
> --enable-lvmlockd-sanlock --enable-dbus-service --enable-notify-dbus
> --enable-dmfilemapd --with-writecache=3Dinternal --with-vdo=3Dinternal
> --with-vdo-format=3D/usr/bin/vdoformat --with-integrity=3Dinternal
> --with-default-use-devices-file=3D1 --disable-silent-rules
> --enable-app-machineid --enable-editline --disable-readline
> ```
>
> ```
> # cat /etc/os-release
> NAME=3D"Red Hat Enterprise Linux CoreOS"
> ID=3D"rhcos"
> ID_LIKE=3D"rhel fedora"
> VERSION=3D"416.94.202407231922-0"
> VERSION_ID=3D"4.16"
> VARIANT=3D"CoreOS"
> VARIANT_ID=3Dcoreos
> PLATFORM_ID=3D"platform:el9"
> PRETTY_NAME=3D"Red Hat Enterprise Linux CoreOS 416.94.202407231922-0"
> ANSI_COLOR=3D"0;31"
> CPE_NAME=3D"cpe:/o:redhat:enterprise_linux:9::baseos::coreos"
> HOME_URL=3D"https://www.redhat.com/"
> DOCUMENTATION_URL=3D"https://docs.okd.io/latest/welcome/index.html"
> BUG_REPORT_URL=3D"https://access.redhat.com/labs/rhir/"
> REDHAT_BUGZILLA_PRODUCT=3D"OpenShift Container Platform"
> REDHAT_BUGZILLA_PRODUCT_VERSION=3D"4.16"
> REDHAT_SUPPORT_PRODUCT=3D"OpenShift Container Platform"
> REDHAT_SUPPORT_PRODUCT_VERSION=3D"4.16"
> OPENSHIFT_VERSION=3D"4.16"
> RHEL_VERSION=3D9.4
> OSTREE_VERSION=3D"416.94.202407231922-0"
> ```
>
> Best regards
>