2023-06-15 Meeting Notes

ReadV rollout status

June 2023: Vector Read rollout (with XCache)
Large-scale vector read patch: notes

2017-xma seem to have issues (possibly IOPs limit) (~30% failure rate on vread test) (memory allocation errors)

2018>should be fine according to preliminary test, more data incoming Monday

likely to move ahead on deployment ~Tuesday

2017 would be retired ~soon

Echo was fine

5.3.3 to 5.5.4 includes more changes that might be causing the 2017 failure (apart from vread)

EBUSY in readV requests (TBD)

https://stfc.atlassian.net/browse/XRD-64

Actions to analysis the existing behaviour with the read request (where EBUSY) is already handled.

SEGV investigations with -S multi-stream flags

CMSD status

https://stfc.atlassian.net/browse/XRD-41

single slash behaviour with cmsd redirector

Sandbox updated to “latest and greatest”:
http://aquilon.gridpp.rl.ac.uk/sandboxes/diff.php?sandbox=jw-gateway-xrootd-cmsd

Contains working solution for / and // file access (but explicitly exporting the pool and /pool names.
Passed Andy H the config to spot any improvements, and to see if he can understand what’s happening.
Above sandbox contains best knowledge, pending tunings gains through testing.

@Thomas, Jyothish (STFC,RAL,SC) idea to incorporate CMSD setup into xrootd / webdav alias is good idea:
however manager hosts don’t have relevant SANs:
                DNS:echo-manager01.gridpp.rl.ac.uk, DNS:rdr.echo.stfc.ac.uk

• Should we request new host certs ? And would these be all necessary ones:
  DNS:echo-manager01.gridpp.rl.ac.uk, DNS:rdr.echo.stfc.ac.uk
  and include also DNS:echo.stfc.ac.uk, DNS:*.echo.stfc.ac.uk,

Can continue with testing, etc. if we need to wait for these.

ATLAS Token testing

James working on functional tests for ATLAS testing