[SOLVED] Restore from LTO " parameter verification errors store"


New Member
Jun 30, 2022
Hello, because I not to find an answer, I would ask for information on whether the length of the parameter name of the file / storage / namespace is limited when saving / restoring data from tape (LTO 7).

My problem is that the backup to tape runs OK. But when restoring I get repeatedly error “ "parameter verification errors store: unable to parse array element: value may only be 65 characters long"”.

The tape drive is newly installed, the tapes are new and newly initialized. I perform recovery to different namespaces, under different permissions, incl. root. The error is still the same.

proxmox-backup: 2.4-1 (running kernel: 5.15.107-2-pve)
proxmox-backup-server: 2.4.2-1 (running version: 2.4.2)
pve-kernel-5.15: 7.4-3
pve-kernel-6.2.11-2-pve: 6.2.11-2
pve-kernel-5.15.107-2-pve: 5.15.107-2
pve-kernel-5.15.107-1-pve: 5.15.107-1
pve-kernel-5.15.39-4-pve: 5.15.39-4
pve-kernel-5.15.35-1-pve: 5.15.35-3
ifupdown2: 3.1.0-1+pmx4
libjs-extjs: 7.0.0-1
proxmox-backup-docs: 2.4.2-1
proxmox-backup-client: 2.4.2-1
proxmox-mail-forward: not correctly installed
proxmox-mini-journalreader: 1.2-1
proxmox-offline-mirror-helper: not correctly installed
proxmox-widget-toolkit: 3.7.0
pve-xtermjs: 4.16.0-1
smartmontools: 7.2-pve3
zfsutils-linux: 2.1.11-pve1

2023-06-01T09:33:22+02:00: Starting tape backup job 'externi-pole:media-pool-01:hq-lto-01:test1-archiv'
2023-06-01T09:33:22+02:00: update media online status
2023-06-01T09:33:22+02:00: media set uuid: 3f33a33b-9804-4362-8430-bd3da6ec5556
2023-06-01T09:33:22+02:00: found 8 groups
2023-06-01T09:33:22+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/100/2023-03-23T09:15:12Z"
2023-06-01T09:35:01+02:00: allocated new writable media 'CZS361L7'
2023-06-01T09:35:01+02:00: trying to load media 'CZS361L7' into drive 'hq-lto-01'
2023-06-01T09:35:38+02:00: found media label CZS361L7 (8d113d01-85f4-4395-9e88-25679b124519)
2023-06-01T09:35:38+02:00: writing new media set label
2023-06-01T09:35:53+02:00: moving to end of media
2023-06-01T09:35:56+02:00: arrived at end of media
2023-06-01T09:37:00+02:00: wrote 1536 chunks (4295.75 MB at 66.33 MB/s)
2023-06-01T09:38:04+02:00: wrote 1540 chunks (4295.75 MB at 67.22 MB/s)
2023-06-01T09:39:07+02:00: wrote 1477 chunks (4295.23 MB at 68.58 MB/s)
2023-06-01T09:40:08+02:00: wrote 1473 chunks (4298.90 MB at 70.32 MB/s)
2023-06-01T09:41:26+02:00: wrote 1491 chunks (4298.90 MB at 55.12 MB/s)
2023-06-01T09:42:39+02:00: wrote 1490 chunks (4295.75 MB at 59.36 MB/s)
2023-06-01T09:44:10+02:00: wrote 1534 chunks (4299.16 MB at 46.95 MB/s)
2023-06-01T09:45:39+02:00: wrote 1529 chunks (4296.02 MB at 48.33 MB/s)
2023-06-01T09:47:11+02:00: wrote 1802 chunks (4295.75 MB at 46.89 MB/s)
2023-06-01T09:48:17+02:00: wrote 1361 chunks (2826.44 MB at 42.61 MB/s)
2023-06-01T09:48:17+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/100/2023-03-23T09:15:12Z"
2023-06-01T09:48:17+02:00: percentage done: 12.50% (1/8 groups)
2023-06-01T09:48:17+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/101/2022-10-27T09:54:14Z"
2023-06-01T09:51:15+02:00: wrote 1908 chunks (4296.28 MB at 40.50 MB/s)
2023-06-01T09:52:50+02:00: wrote 1961 chunks (4296.28 MB at 44.96 MB/s)
2023-06-01T09:53:48+02:00: wrote 1335 chunks (2839.02 MB at 49.57 MB/s)
2023-06-01T09:53:48+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/101/2022-10-27T09:54:14Z"
2023-06-01T09:53:48+02:00: percentage done: 25.00% (2/8 groups)
2023-06-01T09:53:48+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/125/2023-01-18T12:55:27Z"
2023-06-01T09:57:36+02:00: wrote 3230 chunks (4298.64 MB at 38.28 MB/s)
2023-06-01T09:59:28+02:00: wrote 3198 chunks (4295.75 MB at 38.20 MB/s)
2023-06-01T10:00:18+02:00: wrote 1164 chunks (1811.68 MB at 36.35 MB/s)
2023-06-01T10:00:18+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/125/2023-01-18T12:55:27Z"
2023-06-01T10:00:18+02:00: percentage done: 37.50% (3/8 groups)
2023-06-01T10:00:18+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/134/2023-01-19T08:19:56Z"
2023-06-01T10:03:17+02:00: wrote 3366 chunks (4295.49 MB at 40.16 MB/s)
2023-06-01T10:04:24+02:00: wrote 2181 chunks (2759.33 MB at 41.15 MB/s)
2023-06-01T10:04:24+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/134/2023-01-19T08:19:56Z"
2023-06-01T10:04:24+02:00: percentage done: 50.00% (4/8 groups)
2023-06-01T10:04:24+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/142/2023-01-18T12:54:40Z"
2023-06-01T10:07:20+02:00: wrote 1853 chunks (4295.49 MB at 51.32 MB/s)
2023-06-01T10:08:41+02:00: wrote 1864 chunks (4295.49 MB at 52.74 MB/s)
2023-06-01T10:10:07+02:00: wrote 1986 chunks (4295.75 MB at 50.20 MB/s)
2023-06-01T10:10:38+02:00: wrote 679 chunks (1143.73 MB at 36.98 MB/s)
2023-06-01T10:10:38+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/142/2023-01-18T12:54:40Z"
2023-06-01T10:10:38+02:00: percentage done: 62.50% (5/8 groups)
2023-06-01T10:10:38+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/178/2023-01-19T08:23:35Z"
2023-06-01T10:15:47+02:00: wrote 3618 chunks (4295.23 MB at 37.53 MB/s)
2023-06-01T10:17:42+02:00: wrote 3625 chunks (4295.23 MB at 37.35 MB/s)
2023-06-01T10:19:39+02:00: wrote 3689 chunks (4296.54 MB at 36.84 MB/s)
2023-06-01T10:21:35+02:00: wrote 3589 chunks (4296.02 MB at 37.09 MB/s)
2023-06-01T10:22:22+02:00: wrote 1438 chunks (1658.59 MB at 35.40 MB/s)
2023-06-01T10:22:22+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/178/2023-01-19T08:23:35Z"
2023-06-01T10:22:22+02:00: percentage done: 75.00% (6/8 groups)
2023-06-01T10:22:22+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/444/2022-10-27T10:13:19Z"
2023-06-01T10:27:17+02:00: wrote 4653 chunks (4296.28 MB at 34.23 MB/s)
2023-06-01T10:29:26+02:00: wrote 4573 chunks (4296.28 MB at 33.39 MB/s)
2023-06-01T10:31:37+02:00: wrote 4491 chunks (4298.38 MB at 32.76 MB/s)
2023-06-01T10:31:59+02:00: wrote 808 chunks (674.23 MB at 31.11 MB/s)
2023-06-01T10:31:59+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/444/2022-10-27T10:13:19Z"
2023-06-01T10:31:59+02:00: percentage done: 87.50% (7/8 groups)
2023-06-01T10:31:59+02:00: backup snapshot "ns/X-archiv-ukoncenych-projektu/vm/445/2022-10-27T10:38:15Z"
2023-06-01T10:42:53+02:00: wrote 6345 chunks (4295.23 MB at 24.43 MB/s)
2023-06-01T10:45:58+02:00: wrote 6792 chunks (4295.75 MB at 23.31 MB/s)
2023-06-01T10:49:04+02:00: wrote 6317 chunks (4297.85 MB at 23.13 MB/s)
2023-06-01T10:52:28+02:00: wrote 6383 chunks (4295.75 MB at 21.02 MB/s)
2023-06-01T10:56:26+02:00: wrote 6300 chunks (4295.75 MB at 18.06 MB/s)
2023-06-01T10:59:47+02:00: wrote 4403 chunks (2921.33 MB at 15.05 MB/s)
2023-06-01T10:59:52+02:00: end backup externi-pole:"ns/X-archiv-ukoncenych-projektu/vm/445/2022-10-27T10:38:15Z"
2023-06-01T10:59:52+02:00: percentage done: 100.00% (8/8 groups)
2023-06-01T10:59:52+02:00: append media catalog
2023-06-01T10:59:52+02:00: TASK OK

pmt cartridge-memory
using device /dev/tape/by-id/scsi-C0180D60BD-sg
0|Remaining Capacity In Partition|5589652
1|Maximum Capacity In Partition|5722045
2|Tapealert Flags|(empty)
3|Load Count|15
4|MAM Space Remaining|3024
5|Assigning Organization|LTO-CVE
6|Formatted Density Code|5c
7|Initialization Count|5
9|Volume Change Reference|00000013
522|Device Vendor/Serial Number at Last Load|HP      CZ2317014K                                                                                                                                               
523|Device Vendor/Serial Number at Load-1|HP      CZ2317014K                                                                                                                                                 
524|Device Vendor/Serial Number at Load-2|HP      CZ2317014K                                                                                                                                                 
525|Device Vendor/Serial Number at Load-3|HP      CZ2317014K                                                                                                                                                 
544|Total MBytes Written in Medium Life|134394
545|Total MBytes Read In Medium Life|614
546|Total MBytes Written in Current Load|0
547|Total MBytes Read in Current/Last Load|466
548|Logical Position of First Encrypted Block|ffffffffffffffff
549|Logical Position of First Unencrypted Block After the First Encrypted Block|                                                                                                                              ffffffffffffffff
1024|Medium Manufacturer|HPE
1025|Medium Serial Number|V221128039
1026|Medium Length|960
1027|Medium Width|127
1028|Assigning Organization|LTO-CVE
1029|Medium Density Code|5c
1030|Medium Manufacture Date|20221128
1031|MAM Capacity|16352
1032|Medium Type|00
1033|Medium Type Information|0000
4096|Unique Cartridge Identify (UCI)|6c5c71332a32323037323831534f4e5920202020001                                                                                                                              0a43a00400000
4097|Alternate Unique Cartridge Identify (Alt-UCI)|33715c6c4a4c37573031343756323                                                                                                                              2313132383033390040

data recovery wizard error:

Storage is Directory (not ZFS) .
Same problem is on Kernel 6.2 and 5.15.
thank you in advance, Petr
can you also post the first page of the recovery window? what is the source datastores you want to restore from?
can you post your versions of the pbs (with 'proxmox-backup-manager versions --verbose')

also could you open the developer console and check what the parameters are for the api call that gets made?
this should be in the network tab a 'POST' request that failed
proxmox-backup-manager version --verbose
proxmox-backup                2.4-1        running kernel: 5.15.107-2-pve
proxmox-backup-server         2.4.2-1      running version: 2.4.2
pve-kernel-5.15               7.4-3
pve-kernel-6.2.11-2-pve       6.2.11-2
pve-kernel-5.15.107-2-pve     5.15.107-2
pve-kernel-5.15.107-1-pve     5.15.107-1
pve-kernel-5.15.39-4-pve      5.15.39-4
pve-kernel-5.15.35-1-pve      5.15.35-3
ifupdown2                     3.1.0-1+pmx4
libjs-extjs                   7.0.0-1
proxmox-backup-docs           2.4.2-1
proxmox-backup-client         2.4.2-1
proxmox-mail-forward          unknown
proxmox-mini-journalreader    1.2-1
proxmox-offline-mirror-helper unknown
proxmox-widget-toolkit        3.7.0
pve-xtermjs                   4.16.0-2
smartmontools                 7.2-pve3
zfsutils-linux                2.1.11-pve1

The error is the same whether I go to PBS directly at https://servername:8007 or through the proxy https://nicename.ltd, so there is no error in this either.
thats the correct request, but i'd require the content of the 'parameter' (or 'payload') tab on the right
Oh, ok, better?


{"errors":{"store":"unable to parse array element: value may only be 65 characters long"},"message":"parameter verification errors","success":false}
Last edited:


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