Page Comparison

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)

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

SEGV investigations with -S multi-stream flags

CMSD status

single slash behaviour with cmsd redirector

“/” vs “//” issue:

• Characterise the behaviour

• Understand if this is something we need to provide some mitigating action on?

Options:

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