Hello,
I'm currently working on 6 ESXi 5.5 U3 build 4722766 (on HP DL360 G9 Servers).
All of them are linked with fiber through a switch fiber to a HP 3PAR Disk bay where all volumes are stored.
Last night one ESXi has been blocked itself, its log files repeted these lines since last night :
2017-06-22T20:39:05.656Z: <DATASTOREXXXX, 0> Write error to fd 9
2017-06-22T20:40:11.217Z: <DATASTOREXXXX, 0> I/Os from datastore naa.60002ac0000000000000016f00009893 took 60.849006(>= 30.000000) seconds to complete stats computation. Reducing its polling frequency.
2017-06-22T20:41:37.453Z: WARNING: Write 0xff98b66f[512] -> 18 failed. Resource temporarily unavailable
2017-06-22T20:41:37.453Z: <DATASTOREXXXX, 0> Write error to fd 18
2017-06-22T20:41:37.453Z: <DATASTOREXXXX, 0> I/Os from datastore naa.50002ac1a0009893 took 86.234590(>= 30.000000) seconds to complete stats computation. Reducing its polling frequency.
2017-06-22T20:41:37.454Z: WARNING: Write 0xff98b66f[512] -> 9 failed. Resource temporarily unavailable
2017-06-22T20:41:37.454Z: <DATASTOREXXXX, 0> Write error to fd 9
2017-06-22T20:41:37.454Z: WARNING: Write 0xff98b66f[512] -> 5 failed. Resource temporarily unavailable
2017-06-22T20:41:37.454Z: <DATASTOREXXXX5, 0> Write error to fd 5
Because of this issue, VM have been instable and we had to migrate them to another host and they work good now.
I've checked volumes on my HP3PAR bay, there's no alert, no alarm, everything looks good and there is the same thing for the switch fiber.
By the way, i also have a SIOC alarm whereas it's not activated on the datastore :
Do someone has an idea or troubleshooting advice ?
I mean the configuration hasn't been changed and it's really weird that this ESXi works wrong instead of other (which have common storage configuration and the same ESXi version work great)
Thank you for reading
Gael