# Troubleshooting **URL:** https://cta-community.web.cern.ch/c/troubleshooting/9.md [Latest](https://cta-community.web.cern.ch/latest.md) · [Categories](https://cta-community.web.cern.ch/categories.md) --- ## [About the Troubleshooting category](https://cta-community.web.cern.ch/t/about-the-troubleshooting-category/280)
**Author:** [@rbachman](https://cta-community.web.cern.ch/u/rbachman)\ **Replies:** 0\ **Last updated:** [14 March 2024 08:11 UTC](https://cta-community.web.cern.ch/t/about-the-troubleshooting-category/280 "2024-03-14T08:11:15Z")
Welcome to the CTA troubleshooting category! Here you may report issues and bugs encountered on your CTA installation and discuss fixes and workarounds for these. New topics Please use the provided template when creatin… --- ## [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-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: … --- ## [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… --- ## [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… --- ## [Repack issue with many small files](https://cta-community.web.cern.ch/t/repack-issue-with-many-small-files/414)
**Author:** [@atefeh](https://cta-community.web.cern.ch/u/atefeh)\ **Replies:** 6\ **Last updated:** [5 January 2026 09:45 UTC](https://cta-community.web.cern.ch/t/repack-issue-with-many-small-files/414 "2026-01-05T09:45:58Z")
Hi, We are repacking some tapes that contain 60–70k small files, but they are geting stuck in the repack queue in a pending state. Has anyone experienced this issue before or can offer advice on how to resolve it? than… --- ## [Repacking in a container](https://cta-community.web.cern.ch/t/repacking-in-a-container/418)
**Author:** [@ewv](https://cta-community.web.cern.ch/u/ewv)\ **Replies:** 3\ **Last updated:** [17 December 2025 10:55 UTC](https://cta-community.web.cern.ch/t/repacking-in-a-container/418 "2025-12-17T10:55:23Z")
Summary I’m trying to get ATRESYS running in a container. Stages 3-6 all seem to be working, but stage 2 fails with errors like \[ERROR\] \[run\_cmd\] Command failed: /usr/bin/cta-admin --json repack add --vid FA7092 --m… --- ## [Reporting Gets Stuck](https://cta-community.web.cern.ch/t/reporting-gets-stuck/391)
**Author:** [@Mwai](https://cta-community.web.cern.ch/u/Mwai)\ **Replies:** 6\ **Last updated:** [13 August 2025 08:12 UTC](https://cta-community.web.cern.ch/t/reporting-gets-stuck/391 "2025-08-13T08:12:58Z")
Hi all, One of our experiments is currently running a large staging campaign, and we’ve observed that after some time, retrieve jobs stop being reported and remain stuck in the ObjectStore. This issue doesn’t affect arc… --- ## [Drives are running slowly](https://cta-community.web.cern.ch/t/drives-are-running-slowly/386)
**Author:** [@snorberg1](https://cta-community.web.cern.ch/u/snorberg1)\ **Replies:** 11\ **Last updated:** [21 July 2025 16:44 UTC](https://cta-community.web.cern.ch/t/drives-are-running-slowly/386 "2025-07-21T16:44:56Z")
Summary Since Thursday last week the tapes have been mounted and unmounted continuously. Normally the drives will hold on to a tape until all data is written now it seems to unmount and remount the tape all the time even… --- ## [Help understanding what is happening on archive](https://cta-community.web.cern.ch/t/help-understanding-what-is-happening-on-archive/385)
**Author:** [@dmitrylitvintsev](https://cta-community.web.cern.ch/u/dmitrylitvintsev)\ **Replies:** 7\ **Last updated:** [16 July 2025 15:34 UTC](https://cta-community.web.cern.ch/t/help-understanding-what-is-happening-on-archive/385 "2025-07-16T15:34:11Z")
Summary Not seeing files getting archive id for a long time after transfer complteted Details { "clientVersion": { "ctaVersion": "5.11.9.0-1", "xrootdSsiProtobufInterfaceVersion": "v1.26" }, "… --- ## [What should happen during repack?](https://cta-community.web.cern.ch/t/what-should-happen-during-repack/367)
**Author:** [@ewv](https://cta-community.web.cern.ch/u/ewv)\ **Replies:** 5\ **Last updated:** [13 June 2025 13:14 UTC](https://cta-community.web.cern.ch/t/what-should-happen-during-repack/367 "2025-06-13T13:14:33Z")
Summary We have a repack going of about 5 TB. But what’s happening seems very strange. The repack read the tape just fine and place all the contents into an NFS mounted disk area. The archive started and looking at cta-… --- ## [Cta 4.7.3 | object store | NFS | archiving | could not parse header](https://cta-community.web.cern.ch/t/cta-4-7-3-object-store-nfs-archiving-could-not-parse-header/371)
**Author:** [@ViktorKotliar](https://cta-community.web.cern.ch/u/ViktorKotliar)\ **Replies:** 3\ **Last updated:** [5 June 2025 08:30 UTC](https://cta-community.web.cern.ch/t/cta-4-7-3-object-store-nfs-archiving-could-not-parse-header/371 "2025-06-05T08:30:52Z")
Hi all! we have faced a strange problem with archiving and object store. As soon as it is on old CTA version it could be known. Is there any way to make archiving works for this files? Maybe we can clean up the ObjectS… --- ## [Garbage collector stuck in loop](https://cta-community.web.cern.ch/t/garbage-collector-stuck-in-loop/366)
**Author:** [@ewv](https://cta-community.web.cern.ch/u/ewv)\ **Replies:** 3\ **Last updated:** [21 May 2025 18:54 UTC](https://cta-community.web.cern.ch/t/garbage-collector-stuck-in-loop/366 "2025-05-21T18:54:17Z")
We had some issues yesterday with a library. We now seem to be in a place where the garbage collector has taken over in the taped processes. We see a lot of messages like this in the logs “message”:“In GarbageCollector:… --- ## [Problem about cta-frontend-grpc, cta-taped, cta-rmcd](https://cta-community.web.cern.ch/t/problem-about-cta-frontend-grpc-cta-taped-cta-rmcd/364)
**Author:** [@Patrick](https://cta-community.web.cern.ch/u/Patrick)\ **Replies:** 10\ **Last updated:** [16 May 2025 09:04 UTC](https://cta-community.web.cern.ch/t/problem-about-cta-frontend-grpc-cta-taped-cta-rmcd/364 "2025-05-16T09:04:05Z")
Summary I downloaded it according to the official installation instructions of CTA. When I checked the status of the three CTA services, I found various errors, as follows: Details – cta-frontend-grpc cta-frontend-gr… --- ## [Repacking a tape with corrupt file(s)](https://cta-community.web.cern.ch/t/repacking-a-tape-with-corrupt-file-s/362)
**Author:** [@ewv](https://cta-community.web.cern.ch/u/ewv)\ **Replies:** 6\ **Last updated:** [6 May 2025 13:09 UTC](https://cta-community.web.cern.ch/t/repacking-a-tape-with-corrupt-file-s/362 "2025-05-06T13:09:49Z")
We have encountered a tape which has at least one unreadable file. CTA, cta-readtp, and dd all fail to read this file. We can, it seems, skip over it with the positioning commands. How would we go about repacking this t… --- ## [Cta-frontend-grpc fails to start after upgrading to 5.11.2.0-1](https://cta-community.web.cern.ch/t/cta-frontend-grpc-fails-to-start-after-upgrading-to-5-11-2-0-1/344)
**Author:** [@eacciong](https://cta-community.web.cern.ch/u/eacciong)\ **Replies:** 3\ **Last updated:** [13 February 2025 09:59 UTC](https://cta-community.web.cern.ch/t/cta-frontend-grpc-fails-to-start-after-upgrading-to-5-11-2-0-1/344 "2025-02-13T09:59:15Z")
Hi, After the upgrade to version 5.11.2.0-1, the cta-frontend-grpc fails to start. The parameters “no-log-header” and “port” are no longer required, but they are still included in the systemd service unit file. ExecSta… --- ## [In ArchiveMount::reportJobsBatchTransferred(): got an exception](https://cta-community.web.cern.ch/t/in-archivemount-reportjobsbatchtransferred-got-an-exception/338)
**Author:** [@dmitrylitvintsev](https://cta-community.web.cern.ch/u/dmitrylitvintsev)\ **Replies:** 6\ **Last updated:** [7 January 2025 10:37 UTC](https://cta-community.web.cern.ch/t/in-archivemount-reportjobsbatchtransferred-got-an-exception/338 "2025-01-07T10:37:57Z")
Hello, I am observing In ArchiveMount::reportJobsBatchTransferred(): got an exception when archiving files to CTA. This is not a 100% failure - most of the archive calls are successul. This is dCache/CTA setup. CTA v… --- ## [Input/output error /dev/nst1 doesn't respond to a SCSI INQUIRY](https://cta-community.web.cern.ch/t/input-output-error-dev-nst1-doesnt-respond-to-a-scsi-inquiry/336)
**Author:** [@guest\_joshi](https://cta-community.web.cern.ch/u/guest_joshi)\ **Replies:** 3\ **Last updated:** [18 November 2024 10:38 UTC](https://cta-community.web.cern.ch/t/input-output-error-dev-nst1-doesnt-respond-to-a-scsi-inquiry/336 "2024-11-18T10:38:36Z")
Hi, We recently upgraded OS Centos 7 to Rocky 8, now we seeing error on our server which attached to tape library. Its not able to query to scsi device. Everything works find on Centos but not on Rocky. I was googling … --- ## [Input/output error from tape drive device /dev/nst0](https://cta-community.web.cern.ch/t/input-output-error-from-tape-drive-device-dev-nst0/302)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 13\ **Last updated:** [5 October 2024 15:08 UTC](https://cta-community.web.cern.ch/t/input-output-error-from-tape-drive-device-dev-nst0/302 "2024-10-05T15:08:30Z")
Hello, We see this error on a Rocky 9 tapeserver running 5.10.10.1-1.el9 {“epoch\_time”:1716391385.320501824,“local\_time”:“2024-05-22T16:23:05+0100”,“hostname”:“getafix-ts03”,“program”:“cta-taped”,“log\_level”:“INFO”,“pi… --- ## [Repack issues seen. Thoughts?](https://cta-community.web.cern.ch/t/repack-issues-seen-thoughts/296)
**Author:** [@ewv](https://cta-community.web.cern.ch/u/ewv)\ **Replies:** 4\ **Last updated:** [4 October 2024 15:25 UTC](https://cta-community.web.cern.ch/t/repack-issues-seen-thoughts/296 "2024-10-04T15:25:31Z")
Summary We started our first repack and noticed two issues. We are using an NFS file system for the repack area mounted on /data/repack. We are using the file:/ form for the repack directory. Permissions are 777. The … --- ## [Cta-frontend.service aborts - cannot find correct protobuf runtime library](https://cta-community.web.cern.ch/t/cta-frontend-service-aborts-cannot-find-correct-protobuf-runtime-library/71)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 0\ **Last updated:** [26 April 2021 16:14 UTC](https://cta-community.web.cern.ch/t/cta-frontend-service-aborts-cannot-find-correct-protobuf-runtime-library/71 "2021-04-26T16:14:29Z")
Hello, On our test CTA Frontend, cta-frontend.service (3.1.14) decided to stop running because it cannot find the correct version of the protobuf runtime library (please see the error below). I checked that yum hasn’t r… --- ## [Cmake and make question](https://cta-community.web.cern.ch/t/cmake-and-make-question/326)
**Author:** [@Patrick](https://cta-community.web.cern.ch/u/Patrick)\ **Replies:** 2\ **Last updated:** [20 August 2024 15:36 UTC](https://cta-community.web.cern.ch/t/cmake-and-make-question/326 "2024-08-20T15:36:08Z")
According CTA-v4 code tutorial, I do some steps, how can I resolve the problem? (Build CTA - EOSCTA Docs) cmake3 -DPackageOnly:Bool=true ../CTA CMake Warning (dev) in CMakeLists.txt: No project() command is present. … --- ## [Tape aware GC on FST stopped working](https://cta-community.web.cern.ch/t/tape-aware-gc-on-fst-stopped-working/318)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 8\ **Last updated:** [10 July 2024 13:47 UTC](https://cta-community.web.cern.ch/t/tape-aware-gc-on-fst-stopped-working/318 "2024-07-10T13:47:01Z")
Hi, We noticed that the tape aware GC on running on EOS FST (retrieve space) nodes (cta-fst-gcd) stopped working after the upgrade to EOS 5.2.23 and CTA 5.10.10.1: we can see “stagerrm” lines in the log up until the dat… --- ## [CTA-TAPED terminates with SIGSEGV](https://cta-community.web.cern.ch/t/cta-taped-terminates-with-sigsegv/320)
**Author:** [@Mwai](https://cta-community.web.cern.ch/u/Mwai)\ **Replies:** 3\ **Last updated:** [9 July 2024 15:07 UTC](https://cta-community.web.cern.ch/t/cta-taped-terminates-with-sigsegv/320 "2024-07-09T15:07:09Z")
hello, We slowly started migrating to Alma9 but for whatever reason we can’t get cta-taped up and running. Well technically it runs but fails with signal 11 and continues on an infinite loop dumping drive and maintenanc… --- ## [Empty recall mount](https://cta-community.web.cern.ch/t/empty-recall-mount/312)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 2\ **Last updated:** [9 July 2024 13:00 UTC](https://cta-community.web.cern.ch/t/empty-recall-mount/312 "2024-07-09T13:00:33Z")
Hello, This is for CTA 5.10.10.1 on EL9. We see cases where a recall request is queued in the scheduler but for some reason the tape never gets mounted for read. In the queue, after --minretrieverequestage seconds the … --- ## [Cannot start CTA Frontend - 5.10.10.1-1](https://cta-community.web.cern.ch/t/cannot-start-cta-frontend-5-10-10-1-1/308)
**Author:** [@george\_patargias](https://cta-community.web.cern.ch/u/george_patargias)\ **Replies:** 2\ **Last updated:** [4 June 2024 10:00 UTC](https://cta-community.web.cern.ch/t/cannot-start-cta-frontend-5-10-10-1-1/308 "2024-06-04T10:00:37Z")
Hi, I cant seem to be able to start cta-frontend.service after upgrading to CTA 5.10.10.1-1 (EL7). See log lines pasted below. Can you please give us clue? Thanks, George Config Configuring standalone server. 2406… --- ## [Frontend not starting on Alma9](https://cta-community.web.cern.ch/t/frontend-not-starting-on-alma9/304)
**Author:** [@ewv](https://cta-community.web.cern.ch/u/ewv)\ **Replies:** 3\ **Last updated:** [30 May 2024 08:22 UTC](https://cta-community.web.cern.ch/t/frontend-not-starting-on-alma9/304 "2024-05-30T08:22:10Z")
We are having trouble getting the frontend to start on Alma9. I don’t understand why. From the cta-frontend-xrootd.log files =====\> ssi.svclib libXrdSsiCta.so Config Configuring standalone server. Plugin No such file… [Next page](https://cta-community.web.cern.ch/c/troubleshooting/9.md?page=1)