VSAN-Troubleshooting-Reference-Manual
VSAN-Troubleshooting-Reference-Manual
VSAN-Troubleshooting-Reference-Manual
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Diagnostics and <strong>Troubleshooting</strong> <strong>Reference</strong> <strong>Manual</strong> – Virtual SAN<br />
What is outstanding I/O (OIO)? .................................................................................................................. 208<br />
What is latency standard deviation (stddev)? ..................................................................................... 208<br />
What to look for in the <strong>VSAN</strong> Client view? ............................................................................................. 208<br />
<strong>VSAN</strong> CLIENT – FULL SIZE GRAPH .................................................................................................................. 209<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – <strong>VSAN</strong> DISKS ............................................................................................ 210<br />
<strong>VSAN</strong> DISKS – FULL SIZE GRAPHS .................................................................................................................. 211<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – <strong>VSAN</strong> DISKS (DEEP-DIVE).................................................................... 212<br />
WriteBuffer Fill ................................................................................................................................................... 213<br />
Evictions................................................................................................................................................................. 213<br />
<strong>VSAN</strong> DISKS (DEEP-DIVE) – HOST DISK-LAYER AGGREGATE STATS: FULL GRAPHS .............................. 214<br />
Latency, IOPS and Bandwidth ..................................................................................................................... 215<br />
RC Hit Rate ........................................................................................................................................................... 215<br />
RC IOPS breakdown .......................................................................................................................................... 219<br />
Evictions................................................................................................................................................................. 220<br />
Bytes Read from invalidated cache lines/PLOG callback path to RC ........................................ 221<br />
Capacity ................................................................................................................................................................. 221<br />
<strong>VSAN</strong> DISKS (DEEP-DIVE) – DEVICE-LEVEL STATS: FULL GRAPHS ........................................................... 222<br />
WriteBuffer........................................................................................................................................................... 222<br />
A note on LLOG and PLOG ............................................................................................................................. 222<br />
<strong>VSAN</strong> DISKS (DEEP-DIVE) – DEVICE LEVEL STATS: PHYSDISK ................................................................. 226<br />
DiskLatency (ms) ............................................................................................................................................... 226<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – PCPU ........................................................................................................ 227<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – MEMORY .................................................................................................. 228<br />
MEMORY – FULL SIZE GRAPHS ......................................................................................................................... 229<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – DOM OWNER .......................................................................................... 230<br />
DOM OWNER – FULL SIZE GRAPHS ................................................................................................................ 232<br />
RecovWrites ......................................................................................................................................................... 233<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – VM ............................................................................................................ 234<br />
NAVIGATING <strong>VSAN</strong> OBSERVER – NETWORK ................................................................................................ 235<br />
NETWORK – FULL GRAPHS ................................................................................................................................ 236<br />
vmknic throughput ........................................................................................................................................... 237<br />
vmknic errors ...................................................................................................................................................... 237<br />
Pnic Tput ............................................................................................................................................................... 237<br />
Pnic Errors ............................................................................................................................................................ 237<br />
NAVIGATING <strong>VSAN</strong> OBSERVER - <strong>VSAN</strong> (MORE) – CONGESTION ............................................................. 238<br />
<strong>VSAN</strong> (MORE) – CONGESTION – FULL GRAPHS ........................................................................................... 238<br />
NAVIGATING <strong>VSAN</strong> OBSERVER - <strong>VSAN</strong> (MORE) – DISTRIBUTION .......................................................... 239<br />
<strong>VSAN</strong> (MORE) – DISTRIBUTION – FULL GRAPHS ........................................................................................ 240<br />
GENERATE A <strong>VSAN</strong> OBSERVER LOG BUNDLE ................................................................................................ 241<br />
EXAMINE THE <strong>VSAN</strong> OBSERVER OFFLINE LOG BUNDLE ............................................................................. 241<br />
GENERATE A FULL RAW STATS BUNDLE ......................................................................................................... 241<br />
<strong>VSAN</strong> OBSERVER COMMAND LINE OPTIONS ................................................................................................. 242<br />
16. TROUBLESHOOTING VIRTUAL SAN PERFORMANCE ....................................................... 243<br />
VIRTUAL SAN PERFORMANCE EXPECTATIONS ............................................................................................. 243<br />
I/O FLOW ............................................................................................................................................................ 243<br />
Anatomy of a write in hybrid configurations ....................................................................................... 244<br />
Destaging writes from flash to magnetic disk in hybrid configurations ................................. 245<br />
Anatomy of a read in a hybrid configuration ....................................................................................... 247<br />
Anatomy of a read in all-flash configurations ..................................................................................... 248<br />
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 / 8