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\uD83D\uDC65 Participants
Manchester: Alessandra
Glasgow: Sam
Lancs: Steven
\uD83E\uDD45 Goals
List of Epics
New tickets
Consider new functionality / items
Detailed discussion of important topics
Site report activity
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\uD83D\uDDE3 Discussion topics
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Item | Presenter | Notes | |||||
|---|---|---|---|---|---|---|---|
5.5.0 | Echo Gateways ~ 1/2 with 5.5.0 sandbox: Awaiting approval of sandbox (Deployed). | ||||||
‘unified’ config | Do we have a better name, than ‘unified’ ? | ||||||
Stats
| gFal2 CLI slower than API (API creates a context once, for each multi-processing thread). | ||||||
CHEP abstracts | Anything planned for CHEP ? (17 Nov abstract deadline)
| ||||||
Auto-restarter | Currently disabled; to review when Will returns (and a short post-mortem) |
Possible New Time slot:
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Time slot | Ok | Highly inconvenient | |
|---|---|---|---|
Monday 11-12 | 2 | ||
Wednesday 16-17 | |||
Thursday 13-14 | 1 | ||
Friday 14-15 | ? | ? | ? |
Site reports
Glasgow:
Lancaster
✅ Action items
Site reports
21 Sept 2022
Glasgow
Glasgow now on davs / xrootd 5.5.0. As mentioned to James, saw 20Gbit/s rates through the internal gateway before the xrootd service "livelocked" (up but apparently politely ignoring requests). Fixed by restart. We *do* see some packet discards on that link at the time we were at 20Gbit/s so it may be that the discards are associated with "ceph/rados ctx issues"->silent failures as noticed by Jyothish in general for xrdceph failures not being reported back up the xrootd chain.
Need to move to the redirector infrastructure now anyway [which I was holding off on whilst understanding the above] so that should also help reliability.
Also doing some dev work on a fork of XrdCeph to add stream/on-the-fly checksums into the module [which hopefully would reduce the memory impact and io impact of checksums significantly].
(We also need to investigate the discards at a nic config level)
Lancaster redirection balancing:
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Bands indicate contribution of each server, stacked to 100% (left-hand scale). Thick line (right-hand scale) is stddev of percentages, higher values indicating greater imbalance. User+system time is as reported by xrootd, documented as generated from getrusage.
✅ Action items
James Walder prepare 5.5.1 RPMS
James Walder Propose Thursday 13-14 for new meetings
⤴ Decisions
- Thursday 13-14 for new meetings