Why the volum lock?

Hi, great players, I find many messages from blocking in vmkernel.log, in almost all esxi5.1 of home.

I don't know if cela an impact on our production.  got only one or two vm'vmdk changed read-only... I don't know whether or not this "locks".

Please watch a preview of this message and give me some advice, thank you very much!

Connect lik this:

2013-12 - T 10, 22: 23:47.374Z cpu22:13263202) DLX: 3661: flight 'xxxxxxx', 75927552 lock: check time-out [Req mode 1]:

GEN 33, mode 1, owner 516444ef-b7b9240f-5805-xxxxxxxxmtime 6405918

2013-12 - T 10, 22: 23:51.399Z cpu26:13263202) DLX: 4185: flight 'xxxxxx', 75927552 lock: [Req mode: 1] not free:

GEN 33, mode 1, owner 516444ef-b7b9240f-5805-xxxxxxxxmtime 6405918

2013-12 - T 10, 22: 23:51.399Z cpu26:13263202) DLX: 3661: flight 'xxxxxxx', 75927552 lock: check time-out [Req mode 1]:

GEN 33, mode 1, owner 516444ef-b7b9240f-5805-xxxxxxxxmtime 6405918

2013-12 - T 10, 22: 23:55.403Z cpu26:13263202) DLX: 4185: flight 'xxxxxxx', 75927552 lock: [Req mode: 1] not free:

GEN 33, mode 1, owner 516444ef-b7b9240f-5805-xxxxxxxxmtime 6405918

2013-12 - T 10, 22: 24:00.744Z cpu2:13263202) DLX: 3661: flight "xxxxxxxx", 75927552 lock: check time-out [Req mode 1]:

GEN 33, mode 1, owner 516444ef-b7b9240f-5805-xxxxxxxx mtime 6405918

2013-12 - 11 T 02: 20:34.574Z cpu16:13263202) DLX: 3661: flight 'xxxxxxx', 230592512 lock: check time-out [Req mode 1]:

GN 9, mode 1, owner 517186c 1-1b4dfbe4-0e13-xyyyyyyymtime 5279956

In addition, your storage space supports VAAI? VAAI allows the host ESXi offload certain tasks to the storage array. It also removes some of the locking process, since acceleration hardware and locking of ATS (the two things must be supported and made the storage array) can be discharged in your table.

A few strands is not Persian a bad thing, but do not place too many virtual machines on a data store, as this can lead to more excessive locking.

@Avinash: would be better to look at the disk device (u) in esxtop. Then activate the H field: RESVSTATS = reserve Stats. CON/s shows the SCSI conflicts, when a host tries to make the i/o to a LUN that is currently locked. RESV/s shows when something happens on the VMFS volumes use SCSI reservations. In the example of metadata updates.

Tags: VMware

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