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STO7534 VSAN Day 2 Operations (VMworld 2016)

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VMworld 2016 - Virtual SAN (VSAN) Day 2 Operations - STO7534

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STO7534 VSAN Day 2 Operations (VMworld 2016)

  1. 1. Virtual SAN - Day 2 Operations Cormac Hogan, VMware, Inc Paudie ORiordan, VMware, Inc STO7534 #STO7534
  2. 2. • This presentation may contain product features that are currently under development. • This overview of new technology represents no commitment from VMware to deliver these features in any generally available product. • Features are subject to change, and must not be included in contracts, purchase orders, or sales agreements of any kind. • Technical feasibility and market demand will affect final delivery. • Pricing and packaging for any new technologies or features discussed or presented have not been determined. Disclaimer CONFIDENTIAL 2
  3. 3. This Session… • Virtual SAN has been available since March 2014, almost 2.5 years • To date, we have over 5,000 VSAN customers. • VMware recognises that dealing with Virtual SAN Operations on a day to day basis requires more than 2 clicks • Since the launch of Virtual SAN, additional tools for managing, monitoring and troubleshooting Virtual SAN have become available. • In this session, approaches to common problems that actual Virtual SAN administrators face will be discussed. • We will discuss how various tools and approaches to various problems can help you manage your data now the VMware consultant left the building…. 3CONFIDENTIAL
  4. 4. Agenda 4 1 Introduction to Session 2 Monitor – Getting The Basics Right 3 Alerting – What Are My Options? 4 Virtual SAN Upgrade 5 Bring it all together – Handling a Failure (Demo) CONFIDENTIAL
  5. 5. Monitoring – Get the Basics Right vSphere Logging Virtual SAN Trace Files ESXi Core Files
  6. 6. Persistent Logging Challenges with ESXi Boot Devices • vSphere Hosts can be deployed on multiple different types of media with draw backs and advantages – SCSI, SSD, USB, SATADOM • If you are already in production consider how logging gets laid out – SCSI /SAS/ SATA / SSD / VMFS automatically added Scratch located on VMFS – SATADOM VMFS automatically added Scratch located on VMFS • USB / SD (any capacity) – No VMFS No persistent Scratch area – 512 MB RAMDISK instead VMFS/scratch (RAMDISK) /bootbank system vmkDiagnostic /altbootbank /store VMware strongly recommends setting up syslog in all cases CONFIDENTIAL 6
  7. 7. Virtual SAN Trace files • Provides extremely low-level logging for VSAN – VSAN traces require ~500MB of disk space. – Majority of traces in binary format • Persisted to VMFS or NFS if available – VSAN Datastore does not support log redirection at this time • Stored on RAMDISK if no persistent storage available • In case of reboot, Most recent/important VSAN traces persisted to ”store” partition • In case of crash, VSAN traces persisted to diagnostic partition • Since Virtual SAN 6.2 ”urgent trace files” can be redirected to syslog target /bootbank system vmkDiagnostic /altbootbank /store VMFS/scratch (RAMDISK) /store vmkDiagnostic CONFIDENTIAL 7
  8. 8. ESXi Core Dump Partition • Special Partition incase of diagnostic crash – 2.2GB space set aside for memory dump • Ensures full memory dump gets written to persistent media • ESXI hosts with less than <= 512GB Physical Memory – We can safely fit memory dump to USB/SD • ESXi hosts greater than > 512GB Physical Memory – Use SAS/SATA , SATADOM, • vSphere ESXi Network Dump Collector – if no suitable persistent media available vmkDiagnostic /scratch (RAMDISK) /bootbank system /altbootbank /store CONFIDENTIAL 8
  9. 9. Alerting – What Are My Options? vSphere Built-In vRealize Operations vRealize Log Insight
  10. 10. vSphere Built-in • vSphere Native Alerting – 70+ Virtual SAN Health Alarms – Many more vSphere alarms – Alert via SNMP / SMTP • Create custom alarms – Use VMware ESXi VOBs or Observation IDs for VSAN • Virtual SAN Management API 6.2 interface for bespoke solution CONFIDENTIAL 11
  11. 11. vRealize Operations + Log Insight • Virtual SAN awareness with Storage Management Pack – Virtual SAN Dashboards and Heat Maps – Host and Device Statistics – Health Alerts • LogInsight also have Virtual SAN awareness – Virtual SAN content pack – Log aggregation from Virtual SAN nodes – Integration with VROPS alerting CONFIDENTIAL 12
  12. 12. Virtual SAN Upgrade Prerequisites Workflow Monitoring Gotchas
  13. 13. Upgrade Overview • Virtual SAN 6.2 has a new on disk format for disk groups and exposes new Data Services • Upgrades are performed in multiple phases – Phase 1: Upgrade to vSphere 6.0 U2 – Phase 2: Object and Disk format conversion (DFC) Virtual SAN 6.2 vSphere 6.2 Cluster: Manual Mode Phase 1 Phase 2 rvc > But before you begin Phase 0: Validate your current enviroment CONFIDENTIAL 15
  14. 14. Phase 0 – Please Read Before You Start • Virtual SAN 6.2 Release Notes • VMware Product Interoperability • VMware Virtual SAN Hardware • Server, Controller, SSD, Disk on HCL • Controller Firmware, Disk Firmware, • Controller Driver, Enclosure Firmware CONFIDENTIAL 16
  15. 15. Phase 1 - Upgrading from Virtual SAN 5.5 CONFIDENTIAL 17 • You can upgrade from VSAN 5.5 to VSAN 6.X • However…patching is critical • During upgrade some older releases of vSphere 5.5 may cause VMware Virtual SAN Data Unavailability and Instability. • Make sure all critical patches are installed prior to upgrade • Not an issue between VSAN 6.0 and VSAN 6.X More details – please read VMware KB 2113024 and VMware KB 2139969
  16. 16. Phase 1 – VSAN Disk Format Conversion Table CONFIDENTIAL 18 Virtual SAN Starting Version Virtual SAN Target Version Post-upgrade on-disk format upgrade required? Version Virtual SAN 5.5 U1 Virtual SAN 5.5 Update X No - Virtual SAN 5.5 Update X Virtual SAN 6.X Yes 1.0 to 2.0 / 3.0 Virtual SAN 6.0 Virtual SAN 6.1 No - Virtual SAN 6.0 or 6.1 Virtual SAN 6.2 Yes 2.0 to 3.0
  17. 17. Phase 1 – vSphere Software Upgrade • Step 1 – Upgrade vCenter Server to 6.0 U2 • Step 2 – Upgrade ESXi hosts to 6.0 U2 • Maintenance Mode? – Ensure accessibility • Fast, but with risk – Full data migration • Slower, but no risk CONFIDENTIAL 19
  18. 18. Phase 1 – vSphere Software Health Check GOTCHA • vCenter 6.0 Update 2 installed – Health check will not work when ESXi version is < 6.0 U2 CONFIDENTIAL 20
  19. 19. Phase 1 – vSphere Software Health Check • Software Upgraded? – Check your Virtual SAN Health – Update your HCL Database files – Make sure it’s all Green Address any failed tests BEFORE proceeding to the On Disk Format Upgrade! CONFIDENTIAL 21
  20. 20. Phase 2 – Disk Upgrade Prechecks… –All hosts in cluster are connected to vCenter Server –All host upgraded to ESXi 6.2 –No network partitions in the VSAN cluster. –No hosts with auto-claim storage. –No hosts in Maintenance Mode CONFIDENTIAL 22
  21. 21. Phase 2 – Are You Sure? CONFIDENTIAL 23
  22. 22. Phase 2 – Virtual SAN Object and Disk Format Conversion • Two Conversion steps • Objects • On Disk Format Version <= 2 Object Conversion Step Version 2.5 Version 3 Disk Format Conversion Step CONFIDENTIAL 24
  23. 23. Phase 2 – Upgrade Process • 1MB alignment of existing objects < Virtual SAN 6.0. Realigns vsanSparse objects to be on 4K boundaries for Virtual SAN 6.2 Data Services • During Virtual SAN on-disk format phase , a disk group evacuation is performed. – Data is evacuated – The disk group is removed – The disk group is re-added – Rinse and Repeat Evacuate Evacuate Evacuate Version 3 Version 3 Version 3 Version 3 EvacuateEvacuate Evacuate CONFIDENTIAL 25
  24. 24. Phase 2 – Disk Format Upgrade Gotcha • For two-node or three-node clusters, upgrade will fail • Virtual SAN allows upgrades to be performed in “reduced redundancy mode” • Caveats – You are now in “unprotected” mode – Any failures during upgrade process may lead to data unavailability. – Workaround available with Ruby vSphere Console (RVC) vsan.ondisk_upgrade –h hosts_and_clusters: Path to all HostSystems of cluster or ClusterComputeResource -a, --allow-reduced-redundancy Removes the need for one disk group worth of free space, by allowing reduced redundancy during disk upgrade -f, --force Automatically answer all confirmation questions with 'proceed' CONFIDENTIAL 26
  25. 25. Phase 2 – Disk Format Upgrade Gotchas More details – please read VMware KB 2146221 • Mismatched disk group versions • After vSphere upgraded to 6.0 U2, any new disk groups will be formatted with the latest version • This means there will be incompatible Disk Group versions, if you have not yet upgraded the on disk format • Workaround is to reset the disk group version of the new disk group to match what is in the cluster CONFIDENTIAL 27
  26. 26. Virtual SAN Stretched Cluster Upgrade Gotchas • Witness Appliance Considerations • Stretched Cluster Witness Appliances must be treated like ESXi hosts • Avoid rip and replace of Witness Appliance as this will lead to On-Disk format mismatches as discussed earlier • Health Check is unavailable until Witness Appliance is upgraded CONFIDENTIAL 28
  27. 27. Monitoring Disk Format Upgrades • Object Conversion and Disk format upgrades can be monitored using Ruby vSphere Console vsan.upgrade_status Datacenter/computers/VSAN-Cluster –r 60 • Disk format upgrades can be monitored using RVC and/or vSphere Web Client vsan.resync_dashboard Datacenter/computers/VSAN-Cluster –r 60 CONFIDENTIAL 29
  28. 28. Demo time…
  29. 29. Finally Get Somebody “Competent” to Replace Your Hardware! CONFIDENTIAL 31
  30. 30. Q & A CONFIDENTIAL 32
  31. 31. CONFIDENTIAL33
  32. 32. CONFIDENTIAL34

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