VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN esxcli storage core device stats get ........................................................................................................... 140 VERIFYING VIRTUAL SAN STORAGE OPERATION – RVC ............................................................................. 141 vsan.check_state ................................................................................................................................................. 141 vsan.disks_stats ................................................................................................................................................... 141 VIRTUAL SAN DATASTORE SPACE MANAGEMENT ........................................................................................ 142 Maintenance Mode ........................................................................................................................................... 142 SSD, magnetic disk or host failure ............................................................................................................. 143 Small disk drive capacity considerations ............................................................................................... 143 Very large VMDK considerations ............................................................................................................... 144 CHANGING A VM STORAGE POLICY DYNAMICALLY ...................................................................................... 144 PROVISIONING WITH A POLICY THAT CANNOT BE IMPLEMENTED ............................................................. 145 What happens when a threshold is reached? ....................................................................................... 145 COMPONENT DISTRIBUTION ON VIRTUAL SAN ............................................................................................ 146 Checking disk usage distribution with RVC – vsan.disks_stats ..................................................... 146 Checking component distribution with RVC – vsan.disks_limits ................................................. 146 PROACTIVELY BALANCING COMPONENT DISTRIBUTION WITH RVC ......................................................... 147 vsan.proactive_rebalance .............................................................................................................................. 147 VIRTUAL SAN FAILURE REMEDIATION – REBUILDING COMPONENTS ....................................................... 149 vsan.resync_dashboard ................................................................................................................................... 150 vsan.vm_object_info .......................................................................................................................................... 150 vsan.resync_dashboard ................................................................................................................................... 151 TESTING VIRTUAL SAN FUNCTIONALITY - DEPLOYING VMS ..................................................................... 152 diagnostics.vm_create ..................................................................................................................................... 152 diagnostics.vm_create failure – clomd not running .......................................................................... 152 COMMON STORAGE PROBLEMS AND RESOLUTIONS ...................................................................................... 153 Virtual SAN claiming disks but capacity not correct ........................................................................ 153 Virtual SAN not claiming disks - existing partition information ................................................ 153 esxcli vsan storage remove ........................................................................................................................... 154 partedUtil .............................................................................................................................................................. 154 Virtual SAN not claiming disks - Is Local: false ................................................................................... 154 VIRTUAL SAN STORAGE DEVICE FAILURE OBSERVATIONS.......................................................................... 156 Observations when a disk is failed/removed in a controlled manner ...................................... 156 esxcli vsan storage list - unknown ............................................................................................................. 158 vdq –qH: IsPDL.................................................................................................................................................... 159 Observations when a flash device fails .................................................................................................... 160 Observations when a storage controller fails....................................................................................... 161 Storage controller replacement ................................................................................................................. 162 Expectations when a drive is reporting errors .................................................................................... 162 BLINKING LEDS ON DRIVES.............................................................................................................................. 163 PREDICTIVE REPORTING - SMARTD ................................................................................................................. 164 esxcli storage core device smart get ......................................................................................................... 164 CONSIDERATIONS WHEN CLONING ON VIRTUAL SAN ................................................................................. 165 A NOTE ABOUT VSANSPARSE VIRTUAL DISK FORMAT .................................................................................. 165 SUMMARY CHECKLIST FOR VIRTUAL SAN STORAGE .................................................................................... 166 12. TROUBLESHOOTING VIRTUAL SAN UPGRADES................................................................ 167 VIRTUAL SAN UPGRADE - ON-DISK FORMAT V2 ........................................................................................... 167 Before you start upgrading the on-disk format .................................................................................. 167 On-disk format upgrade pre-check: vsan.disks_stats ........................................................................ 168 On-disk format upgrade: vsan.v2_ondisk_upgrade ........................................................................... 169 V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 6
Diagnostics and Troubleshooting Reference Manual – Virtual SAN vsan.v2_ondisk_upgrade pre-checks ......................................................................................................... 171 On-disk format post upgrade check: vsan.disks_limits .................................................................... 173 On-disk format post upgrade check: vsan.disks_stats ...................................................................... 174 ON-DISK UPGRADE CONCERNS – INACCESSIBLE SWAP OBJECTS ................................................................. 175 Removing orphaned vswp objects from the Virtual SAN datastore........................................... 176 vsan.purge_inaccessible_vswp_objects .................................................................................................... 176 ON-DISK UPGRADE – OUT OF RESOURCES TO COMPLETE OPERATION ....................................................... 177 Upgrade path when not enough resources in the cluster ............................................................... 178 13. TROUBLESHOOTING THE VASA PROVIDER ....................................................................... 179 INTRODUCTION TO VASA PROVIDER ............................................................................................................. 179 ANALYSIS OF VASA PROVIDER OPERATIONS ................................................................................................ 181 VIRTUAL SAN PROVIDER NETWORK PORT REQUIREMENTS ...................................................................... 182 TESTING IF PORT 8080 IS OPEN BETWEEN VCENTER AND ESXI .............................................................. 183 KNOWN ISSUE WITH VASA PROVIDERS IN VERSION 5.5 ............................................................................ 184 14. VCENTER SERVER & CLUSTER CONSIDERATIONS ........................................................... 185 ALARMS AND EVENTS ........................................................................................................................................ 185 Triggering Alarms based on Virtual SAN VOBs ................................................................................... 185 VOB IDs for Virtual SAN ................................................................................................................................. 185 Creating a vCenter Server Alarm for a Virtual SAN Event ............................................................. 186 MAINTENANCE MODE AND 3 NODE CLUSTERS .............................................................................................. 188 MULTIPLE DISK GROUPS AND 3 NODE CLUSTERS .......................................................................................... 189 SUPPORT FOR COMPUTE ONLY NODES ............................................................................................................ 189 KNOWN ISSUE: CLOM EXPERIENCED AN UNEXPECTED ERROR. TRY RESTARTING CLOMD .................. 190 HANDLING A VCENTER SERVER FAILURE ...................................................................................................... 191 vsan.recover_spbm ............................................................................................................................................ 191 Preserving Storage Policies during vCenter Backups & Restores ............................................... 192 KNOWN ISSUE: MIGRATION COMPLETE BUT MAINTENANCE MODE NOT ENTERED ............................... 193 vsan.disks_stats ................................................................................................................................................... 193 vsan.disk_object_info ........................................................................................................................................ 193 vsan.object_info .................................................................................................................................................. 194 vsan.object_status_report .............................................................................................................................. 195 vsan.check_state --refresh-state ................................................................................................................. 196 15. GETTING STARTED WITH VSAN OBSERVER ...................................................................... 197 WHAT IS VSAN OBSERVER? ............................................................................................................................ 197 LAUNCHING VSAN OBSERVER WITHOUT INTERNET ACCESS ..................................................................... 198 JavaScript and CSS files downloads .......................................................................................................... 198 VSAN Observer folder structure .................................................................................................................. 199 Downloading Fonts ........................................................................................................................................... 200 HTML files modifications ............................................................................................................................... 200 LAUNCHING VSAN OBSERVER ........................................................................................................................ 202 LAUNCHING VSAN OBSERVER WITH A NON-DEFAULT PORT ..................................................................... 203 OpenSSL::X509::CertificateError: error getting time ....................................................................... 205 WHAT TO LOOK FOR IN VSAN OBSERVER ..................................................................................................... 205 NAVIGATING VSAN OBSERVER – VSAN CLIENT ......................................................................................... 206 What is latency? ................................................................................................................................................. 206 What is I/O per second (IOPS)? .................................................................................................................. 207 What is bandwidth? ......................................................................................................................................... 207 What is congestion?.......................................................................................................................................... 207 V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 7
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