# Latest **URL:** https://cta-community.web.cern.ch/latest.md [Latest](https://cta-community.web.cern.ch/latest.md) · [Categories](https://cta-community.web.cern.ch/categories.md) --- ## [Welcome to CTA Community](https://cta-community.web.cern.ch/t/welcome-to-cta-community/7)
**Author:** [@system](https://cta-community.web.cern.ch/u/system)\ **Replies:** 0\ **Last updated:** [22 June 2020 07:58 UTC](https://cta-community.web.cern.ch/t/welcome-to-cta-community/7 "2020-06-22T07:58:36Z")
Welcome to CTA Community, a forum for bringing together users, collaborators and developers interested in the CERN Tape Archive. This is the place to exchange ideas, tips and to help each other in an easy and user-friend… --- ## [Questions on verification queuing](https://cta-community.web.cern.ch/t/questions-on-verification-queuing/452)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 1\ **Last updated:** [29 October 2026 09:52 UTC](https://cta-community.web.cern.ch/t/questions-on-verification-queuing/452 "2026-10-29T09:52:54Z")
Hello, We are submitting multiple files for verification via look like the following vid=TD4615; for i in $(cat ${vid}\_archiveids\_minusone); do XrdSecPROTOCOL=sss XrdSecSSSKT=/etc/cta/tape-verification.keytab cta-verif… --- ## [ATRESYS fails with KeyError: 'supply' creating repack tape pools](https://cta-community.web.cern.ch/t/atresys-fails-with-keyerror-supply-creating-repack-tape-pools/451)
**Author:** [@eacciong](https://cta-community.web.cern.ch/u/eacciong)\ **Replies:** 4\ **Last updated:** [22 October 2026 09:35 UTC](https://cta-community.web.cern.ch/t/atresys-fails-with-keyerror-supply-creating-repack-tape-pools/451 "2026-10-22T09:35:27Z")
Hello, We have encountered an issue with ATRESYS during the repack preparation step, specifically when archive routes and tape pools are being created automatically. The error we get in the logs is the following: \[ERR… --- ## [2026-10-01 - CTA Community operations #2 - follow up survey](https://cta-community.web.cern.ch/t/2026-10-01-cta-community-operations-2-follow-up-survey/453)
**Author:** [@jleduc](https://cta-community.web.cern.ch/u/jleduc)\ **Replies:** 0\ **Last updated:** [11 October 2026 13:21 UTC](https://cta-community.web.cern.ch/t/2026-10-01-cta-community-operations-2-follow-up-survey/453 "2026-10-11T13:21:42Z")
Many thanks for the community operations meeting we had together last week. As discussed during the AOB part, I am preparing a survey for the CTA workshop in November 2026. Below is an initial set of questions for this… --- ## [Cta-ops-verify-tape usage check](https://cta-community.web.cern.ch/t/cta-ops-verify-tape-usage-check/433)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 13\ **Last updated:** [30 September 2026 10:10 UTC](https://cta-community.web.cern.ch/t/cta-ops-verify-tape-usage-check/433 "2026-09-30T10:10:58Z")
I have run cta-ops-verify-tape using –random 1000 assuming that it will verify 1000 randomly chosen files from the middle of a tape (that contains a total of 6,967 files) plus 10 from the beginning and 10 from the end of… --- ## [Potential serious issue with CTA not coordinating mounts and/or sending two commands to the same drive](https://cta-community.web.cern.ch/t/potential-serious-issue-with-cta-not-coordinating-mounts-and-or-sending-two-commands-to-the-same-drive/449)
**Author:** [@tmesser](https://cta-community.web.cern.ch/u/tmesser)\ **Replies:** 1\ **Last updated:** [18 September 2026 08:29 UTC](https://cta-community.web.cern.ch/t/potential-serious-issue-with-cta-not-coordinating-mounts-and-or-sending-two-commands-to-the-same-drive/449 "2026-09-18T08:29:43Z")
I have been trying to gather more information on an issue Fermilab has encountered with CTA on two different libraries, and that Spectra has reported as a known problem at another CTA site (I do not know which site). In… --- ## [Restoring deleted files from CTA recycle log](https://cta-community.web.cern.ch/t/restoring-deleted-files-from-cta-recycle-log/448)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 2\ **Last updated:** [16 September 2026 10:41 UTC](https://cta-community.web.cern.ch/t/restoring-deleted-files-from-cta-recycle-log/448 "2026-09-16T10:41:09Z")
Hi, I am trying to use/test cta-restore-deleted-files tool following I have done eos vid set map -grpc key:UUID vuid:2 vgid:2 and eos -r 0 0 vid add gateway 130.246.182.56 grpc where the IP is of the admin fronte… --- ## [Any chance of a Debian (.deb) build of CTA someday?](https://cta-community.web.cern.ch/t/any-chance-of-a-debian-deb-build-of-cta-someday/445)
**Author:** [@jlutran](https://cta-community.web.cern.ch/u/jlutran)\ **Replies:** 1\ **Last updated:** [9 September 2026 15:08 UTC](https://cta-community.web.cern.ch/t/any-chance-of-a-debian-deb-build-of-cta-someday/445 "2026-09-09T15:08:33Z")
Hello CTA team, We are evaluating CTA + dCache as the replacement for the current tape backend (TS4500 libraries with TS1160 drives). We set up a production-shape lab running CTA 5.11.18 with a dCache 11.2 buffer end t… --- ## [TS1170 drives and humidity](https://cta-community.web.cern.ch/t/ts1170-drives-and-humidity/442)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 4\ **Last updated:** [4 September 2026 10:04 UTC](https://cta-community.web.cern.ch/t/ts1170-drives-and-humidity/442 "2026-09-04T10:04:35Z")
Hello, We have been having serious and persistent humidity issues affecting the operation of TS1170 tape drives in both of our Spectra TFinity libraries. For one, the Recommended and Allowed Relative Humidity (RH) rang… --- ## [5th CERN Tape Archive Workshop (CTA 2026)](https://cta-community.web.cern.ch/t/5th-cern-tape-archive-workshop-cta-2026/443)
**Author:** [@mdavis](https://cta-community.web.cern.ch/u/mdavis)\ **Replies:** 0\ **Last updated:** [31 August 2026 14:21 UTC](https://cta-community.web.cern.ch/t/5th-cern-tape-archive-workshop-cta-2026/443 "2026-08-31T14:21:51Z")
The 5th CERN Tape Archive Workshop (CTA 2026) will take place on 9-10 November 2026 at DESY, Hamburg, Germany. This year will have an exciting programme of technical talks, as we announce the features coming up in the n… --- ## [Read mount failure ('volume in use') when requested just after a write session](https://cta-community.web.cern.ch/t/read-mount-failure-volume-in-use-when-requested-just-after-a-write-session/441)
**Author:** [@eacciong](https://cta-community.web.cern.ch/u/eacciong)\ **Replies:** 3\ **Last updated:** [26 August 2026 21:44 UTC](https://cta-community.web.cern.ch/t/read-mount-failure-volume-in-use-when-requested-just-after-a-write-session/441 "2026-08-26T21:44:33Z")
Hi, We have encountered a read mount error for a tape because the volume was already in use for writing on another drive: { "epoch\_time": 1786633343.156102670, "local\_time": "2026-08-13T17:02:23+0200", "cta\_versi… --- ## [Tape read error when using cta-readtp](https://cta-community.web.cern.ch/t/tape-read-error-when-using-cta-readtp/440)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 5\ **Last updated:** [21 August 2026 08:37 UTC](https://cta-community.web.cern.ch/t/tape-read-error-when-using-cta-readtp/440 "2026-08-21T08:37:12Z")
Hello, We are trying to recover some data from a damaged/dodgy tape using cta-readtp tool. Do you know what the following error is tapeReadError="Failed ST ioctl (MTFSF) in DriveGeneric::spaceFileMarksForward Errno=5: … --- ## [Cta-ops-verify-tape ignoring --random limit i(v3.8.2)](https://cta-community.web.cern.ch/t/cta-ops-verify-tape-ignoring-random-limit-i-v3-8-2/439)
**Author:** [@eacciong](https://cta-community.web.cern.ch/u/eacciong)\ **Replies:** 3\ **Last updated:** [7 August 2026 10:54 UTC](https://cta-community.web.cern.ch/t/cta-ops-verify-tape-ignoring-random-limit-i-v3-8-2/439 "2026-08-07T10:54:52Z")
Hello, We have detected an unexpected behavior in the verification module of the CTA OPS tools after updating from version 3.7.3 to 3.8.2. The main issue is that the verify-tape process is processing significantly more… --- ## [EOS/CTA release with tape tokens](https://cta-community.web.cern.ch/t/eos-cta-release-with-tape-tokens/438)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 2\ **Last updated:** [16 July 2026 14:39 UTC](https://cta-community.web.cern.ch/t/eos-cta-release-with-tape-tokens/438 "2026-07-16T14:39:47Z")
Hello, Just a quick question: what is the plan for the release of EOS (and CTA) that include support for tape operations with tokens (storage.stage and storage.poll in token scope) that were implemented in XRootD 6.0? I… --- ## [Understanding a failure on archive](https://cta-community.web.cern.ch/t/understanding-a-failure-on-archive/437)
**Author:** [@dmitrylitvintsev](https://cta-community.web.cern.ch/u/dmitrylitvintsev)\ **Replies:** 5\ **Last updated:** [22 June 2026 17:38 UTC](https://cta-community.web.cern.ch/t/understanding-a-failure-on-archive/437 "2026-06-22T17:38:12Z")
Summary This is a free form request to help understanding of some failures on archive which have not been able to get to the bottom of. Details CTA Admin Client xrd-ssi-protobuf CTA Frontend Server xrd-ssi-protobuf C… --- ## [Kerberos keytab issue after updating frontend to 5.11.18.0-2](https://cta-community.web.cern.ch/t/kerberos-keytab-issue-after-updating-frontend-to-5-11-18-0-2/436)
**Author:** [@tmesser](https://cta-community.web.cern.ch/u/tmesser)\ **Replies:** 2\ **Last updated:** [4 June 2026 22:21 UTC](https://cta-community.web.cern.ch/t/kerberos-keytab-issue-after-updating-frontend-to-5-11-18-0-2/436 "2026-06-04T22:21:00Z")
Summary After updating a test frontend from 5.11.11.0-1 to 5.11.18.0-2, cta-frontend-grpc generates continuous errors about being unable to find a Kerberos principal. Details CTA version: 5.11.18.0-2 Operating System a… --- ## [Archive Jobs Stalled with reportJobsBatchTransferred Exception](https://cta-community.web.cern.ch/t/archive-jobs-stalled-with-reportjobsbatchtransferred-exception/427)
**Author:** [@atefeh](https://cta-community.web.cern.ch/u/atefeh)\ **Replies:** 6\ **Last updated:** [2 June 2026 13:32 UTC](https://cta-community.web.cern.ch/t/archive-jobs-stalled-with-reportjobsbatchtransferred-exception/427 "2026-06-02T13:32:35Z")
We had some files belonging to three tapepools on the disk buffer. The EOS redundancy was d1::t0, but some of these files were already on tape while others were not. We tried to resubmit closew for all files, but we got… --- ## [Cta-ops-verification-feeder error](https://cta-community.web.cern.ch/t/cta-ops-verification-feeder-error/434)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 6\ **Last updated:** [27 May 2026 08:15 UTC](https://cta-community.web.cern.ch/t/cta-ops-verification-feeder-error/434 "2026-05-27T08:15:05Z")
Hello, We get the following error when we try ro run cta-ops-verification-feeder (by selecting a random tape for verification as a test) (venv) \[root@cta-adm-fac1 georgep\]# XrdSecPROTOCOL=sss XrdSecSSSKT=/etc/cta/tape-… --- ## [Occasional I/O errors on LTO-10 drives](https://cta-community.web.cern.ch/t/occasional-i-o-errors-on-lto-10-drives/431)
**Author:** [@tmesser](https://cta-community.web.cern.ch/u/tmesser)\ **Replies:** 3\ **Last updated:** [19 May 2026 12:36 UTC](https://cta-community.web.cern.ch/t/occasional-i-o-errors-on-lto-10-drives/431 "2026-05-19T12:36:34Z")
At Fermilab, we have recently placed LTO-10 drives in production. A Spectra TFinity Plus library with these drives has not shown any problems. An IBM TS4500 library is showing occasional issues. After a drive has writte… --- ## [Announcement of new CTA public release: 5.11.18.0-2](https://cta-community.web.cern.ch/t/announcement-of-new-cta-public-release-5-11-18-0-2/432)
**Author:** [@afonso](https://cta-community.web.cern.ch/u/afonso)\ **Replies:** 0\ **Last updated:** [13 May 2026 13:55 UTC](https://cta-community.web.cern.ch/t/announcement-of-new-cta-public-release-5-11-18-0-2/432 "2026-05-13T13:55:17Z")
New CTA public release Dear CTA community, We have made available a new version of CTA in our stable repo: 5.11.18.0-2 Release documentation Changelog documentation This release was tested with: EOS: 5.3.23.el9 XRoo… --- ## [Cta-verify-file not reliable?](https://cta-community.web.cern.ch/t/cta-verify-file-not-reliable/430)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 3\ **Last updated:** [6 May 2026 13:36 UTC](https://cta-community.web.cern.ch/t/cta-verify-file-not-reliable/430 "2026-05-06T13:36:22Z")
Hi, We are using cta-ops-verify-tapeto carry out full and partial (10,1000,10) verifcation of tapes. We have observed the following: Files that failed to be verified with the message {"epoch\_time":1777455703.65370199… --- ## [Mark a drive down without waiting for the complete tape session](https://cta-community.web.cern.ch/t/mark-a-drive-down-without-waiting-for-the-complete-tape-session/429)
**Author:** [@eacciong](https://cta-community.web.cern.ch/u/eacciong)\ **Replies:** 3\ **Last updated:** [29 April 2026 09:21 UTC](https://cta-community.web.cern.ch/t/mark-a-drive-down-without-waiting-for-the-complete-tape-session/429 "2026-04-29T09:21:46Z")
Hi everyone, I was wondering if it’s possible to quickly take a drive down, that is, as soon as the current read or write request finishes. It waits for the tape session to finish, but in most cases, this takes several… --- ## [EOS does not point to the correct location of files on tape](https://cta-community.web.cern.ch/t/eos-does-not-point-to-the-correct-location-of-files-on-tape/428)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 10\ **Last updated:** [17 April 2026 13:25 UTC](https://cta-community.web.cern.ch/t/eos-does-not-point-to-the-correct-location-of-files-on-tape/428 "2026-04-17T13:25:14Z")
Hi, We identified two files on EOS which look like they are neither on tape nor on disk (d0::t0) /storaged\_dls/dls/container/m02/nt33797-15/247088895' Flags: 0644 Size: 5164600362 Status: locations::uncommitted Modi… --- ## [Cta-admin dr ls delegateToImpl failed: Column SESSION\_ELAPSED\_TIME](https://cta-community.web.cern.ch/t/cta-admin-dr-ls-delegatetoimpl-failed-column-session-elapsed-time/425)
**Author:** [@Terry](https://cta-community.web.cern.ch/u/Terry)\ **Replies:** 11\ **Last updated:** [2 April 2026 15:58 UTC](https://cta-community.web.cern.ch/t/cta-admin-dr-ls-delegatetoimpl-failed-column-session-elapsed-time/425 "2026-04-02T15:58:32Z")
Summary cta-admin dr ls delegateToImpl failed: Column SESSION\_ELAPSED\_TIME contains the value -236959 Details CTA version: 5.11.11.0-1. Operating System and version: el9 5.14.0-611.13.1.el9\_7.x86\_64 Xrootd version: … --- ## [Large scale tape verification with of cta-ops-verify-tape](https://cta-community.web.cern.ch/t/large-scale-tape-verification-with-of-cta-ops-verify-tape/426)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 1\ **Last updated:** [26 March 2026 15:46 UTC](https://cta-community.web.cern.ch/t/large-scale-tape-verification-with-of-cta-ops-verify-tape/426 "2026-03-26T15:46:22Z")
Hello, We would like to be able to use the cta-ops-verify-tape tool to verify tapes on a large scale in our infrastructure. The way we envisage to do this is by running a wrapper Bash script which will call the tool whe… --- ## [Use of cta-ops-verify-tape](https://cta-community.web.cern.ch/t/use-of-cta-ops-verify-tape/394)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 44\ **Last updated:** [19 March 2026 14:38 UTC](https://cta-community.web.cern.ch/t/use-of-cta-ops-verify-tape/394 "2026-03-19T14:38:33Z")
Hello, Would it be possible to get some clues on how to use cta-ops-verify-tape tool? I tried to run the tool on one f our preprod tapes using the default config options in cta-operations-utilities/cta-ops-config.yaml … --- ## [SSS keytab/auth issue in EOS+CTA lab](https://cta-community.web.cern.ch/t/sss-keytab-auth-issue-in-eos-cta-lab/424)
**Author:** [@aminekarabila](https://cta-community.web.cern.ch/u/aminekarabila)\ **Replies:** 3\ **Last updated:** [19 March 2026 07:21 UTC](https://cta-community.web.cern.ch/t/sss-keytab-auth-issue-in-eos-cta-lab/424 "2026-03-19T07:21:18Z")
Summary Hello, I am debugging an SSS/keytab authentication issue in a small EOS+CTA Vagrant lab. At the moment, the initial sync::create request from the MGM to the CTA frontend is successful, but the workflow later fa… --- ## [Sporadic Input/Output errors during tape labeling](https://cta-community.web.cern.ch/t/sporadic-input-output-errors-during-tape-labeling/422)
**Author:** [@eacciong](https://cta-community.web.cern.ch/u/eacciong)\ **Replies:** 4\ **Last updated:** [10 March 2026 16:53 UTC](https://cta-community.web.cern.ch/t/sporadic-input-output-errors-during-tape-labeling/422 "2026-03-10T16:53:44Z")
Hi, We have been experiencing sporadic Input/output errors during the tape labeling process. These are brand new LTO-10 tapes. Out of 150 tapes labeled, 3 have failed, all showing the following error: 2026-03-03 18:46… --- ## [Two copy archival reporting intermittently failing with "Failed to find archive file entry in the catalogue."](https://cta-community.web.cern.ch/t/two-copy-archival-reporting-intermittently-failing-with-failed-to-find-archive-file-entry-in-the-catalogue/419)
**Author:** [@tom.byrne](https://cta-community.web.cern.ch/u/tom.byrne)\ **Replies:** 30\ **Last updated:** [5 March 2026 14:35 UTC](https://cta-community.web.cern.ch/t/two-copy-archival-reporting-intermittently-failing-with-failed-to-find-archive-file-entry-in-the-catalogue/419 "2026-03-05T14:35:49Z")
We are seeing a very slow rate of files to tape despite files being read from EOS and written to tape. The issue seems to be due to the following error message: {"epoch\_time":1764190023.326574545,"local\_time":"2025-11-… --- ## [Timeout values for slow Spectra library response?](https://cta-community.web.cern.ch/t/timeout-values-for-slow-spectra-library-response/421)
**Author:** [@tmesser](https://cta-community.web.cern.ch/u/tmesser)\ **Replies:** 3\ **Last updated:** [4 March 2026 16:47 UTC](https://cta-community.web.cern.ch/t/timeout-values-for-slow-spectra-library-response/421 "2026-03-04T16:47:12Z")
To be clear, I don’t necessarily consider this a CTA bug, but I’m providing information and looking for suggestions. Summary cta-rmcd returns 0 even when a mount or dismount times out Details CTA version: 5.11.11.0-1 O… [Next page](https://cta-community.web.cern.ch/latest.md?page=1)