# Changing default verification algorithm: auto-verify-alg

**URL:** <https://forums.linbit.com/t/changing-default-verification-algorithm-auto-verify-alg/1166>\
**Category:** LINSTOR\
**Tags:** drbd, linstor\
**Created:** [March 3, 2026, 2:10pm UTC](https://forums.linbit.com/t/changing-default-verification-algorithm-auto-verify-alg/1166 "2026-03-03T14:10:12Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![candlerb](https://avatars.discourse-cdn.com/v4/letter/c/c5a1d2/32.png) [@candlerb](https://forums.linbit.com/u/candlerb)\
**Post date:** [October 8, 2026, 10:28am UTC](https://forums.linbit.com/t/changing-default-verification-algorithm-auto-verify-alg/1166/11 "2026-10-08T10:28:03Z")

</div>

FYI, this bit me in a PVE8 to PVE9 upgrade. After upgrading one node, the new PVE 7.0 kernel cannot configure resources from linstor:

```plaintext
root@virtual5:/home/brian# journalctl -eu linstor-satellite
...
Oct 08 03:21:08 virtual5 Satellite[2541]: 2026-10-08 03:21:08.717 [DeviceManager] INFO LINSTOR/Satellite/479904 SYSTEM - DRBD regenerated resource file: /var/lib/linstor.d/linstor_db.res
...
Oct 08 03:21:08 virtual5 Satellite[2541]: 2026-10-08 03:21:08.807 [DeviceManager] ERROR LINSTOR/Satellite/479904 SYSTEM - Restoring resource file from backup: linstor_db
Oct 08 03:21:08 virtual5 Satellite[2541]: 2026-10-08 03:21:08.818 [DeviceManager] ERROR LINSTOR/Satellite/479904 SYSTEM - Failed to adjust DRBD resource linstor_db [Report number 6AC76E6D-B63BE-000000]

```

```plaintext
brian@virtual1:~$ linstor error-reports show 6AC76E6D-B63BE-000000
...
drbdsetup new-peer linstor_db 0 --_name=virtual1 --verify-alg=crct10dif --shared-secret=kEZ97aaMcMPv7Amb6reY --cram-hmac-alg=sha1

The external command sent the following error information:
 [ne] minor 1002 (vol:0) /dev/sata_ssd/linstor_db_00000 missing from kernel
linstor_db: Failure: (146) VERIFYAlgNotAvail
additional info from kernel:
failed to allocate crct10dif for verify

Command 'drbdsetup new-peer linstor_db 0 --_name=virtual1 --verify-alg=crct10dif --shared-secret=kEZ97aaMcMPv7Amb6reY --cram-hmac-alg=sha1' terminated with exit code 10
drbdadm: new-peer linstor_db: skipped due to earlier error

```

```plaintext
root@virtual5:/home/brian# grep verify /var/lib/linstor.d/linstor_db.res
        verify-alg "crct10dif";

```

So I’d strongly suggest fixing up the verify-alg _before_ doing an upgrade. I’m going to have to try to sort it mid-upgrade ☹

Good news: `linstor c sp DrbdOptions/auto-verify-algo-disable true` was enough to bring all the drbd resources back to life. After this, `verify-alg` is no longer present in `/var/lib/linstor.d/*.res`. Then `linstor c opt --verify-alg sha256` adds it back in again.

Bad news: `DrbdOptions/auto-verify-algo-disable true` also disables `cram-hmac-alg` and `shared-secret` in the network connection parameters. You can end up in a state where the resource has this enabled on one side but not the other (depending on when linstor satellites are restarted), so they [refuse to connect](https://forums.linbit.com/t/linstor-drbd-one-side-with-authentication-one-without/1291/2) until this is resolved.

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_[View the full topic](https://forums.linbit.com/t/changing-default-verification-algorithm-auto-verify-alg/1166)._