DFSc Working Group

Meeting Date

• TEAMS: 2022-08-17

Invitees - Attendees

• Nick, Dave, Nathan, Guoxiang

Review and accept previous meeting minutes.

• CsDFScWgMeeting20220811

Proposed Agenda Items

Old business

Action items for this meeting 2022-08-17

• Retired all snapshots by 2022-08-15 (ldpaniak, nfish) https://rt.uwaterloo.ca/Ticket/Display.html?id=1228804
• Disable new snapshots throughout upgrade (ldpaniak)

New business

• snaptrims below 154k - aim for zero modulo hard links: https://icinga.cscf.uwaterloo.ca/grafana/d/03EnhXZGz/dfsc-monitoring?orgId=1&from=1660631690286&to=1660756009053&var-hostname=dc-3558-421.cloud.cs.uwaterloo.ca&chunkNotFound=&viewPanel=52
• Schedule upgrade of 42x cluster (ceph and OS) for 2022-08-24 (ldpaniak)
  • online, reduced performance esp. cs-teaching. Only a few minutes at one MDS for teaching where performance might effectively be same as down
  • Upgrade checklist (nfish)
  • OS upgrade on 42x systems to follow ceph upgrade
• root-squash mounts for client-side updates (nfish/gxshen) - might be bugs https://tracker.ceph.com/issues/56067
• Old ceph clients out there? Not showing up from the server side (nfish)
• Next -gen hardware for 2023-24 budget year. Rack space in EC2/MC-IST. SSD endurance, erasure-coding. Collect current/historic disk bytes written (ldpaniak/dlgawley/nfish)
• upcoming topology change in HS100 network (dlgawley/ldpaniak)

Action items for next meeting

• Remove remaining snaptrims on 2022-08-15 (ldpaniak)
• Prepare for cluster upgrade (nfish/ldpaniak)
• Announce to School upgrade at 17:00 on 2022-08-24 (ldpaniak). Send by EOD 2022-08-18