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I lost connection to an iSCSI disk, and after reconnecting the datastore has not mounted. I can see the VMFS partition, but I'm not sure how to mount it manually. The UI options don't seem to offer an option. I can create a new datastore, but only by deleting the current one.

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the esxcfg-volume -l command outputs the following:

Scanning for VMFS-6 host activity (4096 bytes/HB, 1024 HBs).
VMFS UUID/label: 5e125199-81833a30-7767-a0369f07542d/mynas2
Can mount: Yes
Can resignature: Yes
Extent name: naa.60014055ecf517ed409fd40c2d8b6ad5:1 range: 0 - 409343 (MB)

partedUtil getptbl /vmfs/devices/disk/naa.60014055ecf517ed409fd40c2d8b6ad5

displays the following

gpt
52216 255 63 838860800
1 2048 838858752 AA31E02A400F11DB9590000C2911D1B8 vmfs 0

and vmfstools -V generates the following output in /var/log/vmkernel.log

2020-01-14T06:03:33.259Z cpu4:2099636)WARNING: NFS: 1227: Invalid volume UUID snap-4738e717-5e125199-5197aa88-8da9-a0369f07542d
2020-01-14T06:03:33.276Z cpu4:2099636)HBX: 1034: 'mynas2': HB at offset 3637248 - Setting pulse failed: Not supported:
2020-01-14T06:03:33.276Z cpu4:2099636)  [HB state abcdef02 offset 3637248 gen 27 stampUS 1257591573 uuid 5e1d54ef-e63704a9-378c-a0369f07542d jrnl <FB 0> drv 24.82 lockImpl 4 ip 10.4.1.11]
2020-01-14T06:03:33.276Z cpu4:2099636)WARNING: FSAts: 1550: Denying reservation access on an ATS-only vol 'mynas2'
2020-01-14T06:03:33.276Z cpu4:2099636)WARNING: HBX: 2423: ATS-Only VMFS volume 'mynas2' is not mounted. This host does not support ATS, or ATS initialization failed.
2020-01-14T06:03:33.276Z cpu4:2099636)WARNING: HBX: 2437: Failed to initialize VMFS distributed locking on volume 5e125199-81833a30-7767-a0369f07542d: Not supported
2020-01-14T06:03:33.333Z cpu1:2099636)FSS: 6092: No FS driver claimed device 'snap-4738e717-5e125199-5197aa88-8da9-a0369f07542d': No filesystem on the device
2020-01-14T06:03:33.333Z cpu7:2099797)VC: 4616: Device rescan time 7 msec (total number of devices 4)
2020-01-14T06:03:33.333Z cpu7:2099797)VC: 4619: Filesystem probe time 131 msec (devices probed 4 of 4)
2020-01-14T06:03:33.333Z cpu7:2099797)VC: 4621: Refresh open volume time 0 msec

answer: VM Inaccessible

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obtain the UUID of VMFS partition using

esxcli storage vmfs snapshot list

then mount it using

esxcli storage vmfs snapshot mount -u <UUID>
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  • Thanks, this saved me a bunch of problems when trying to migrate an iscsi volume on TrueNAS, where only one of the two datastore where visible on ESXi.
    – psychowood
    Feb 6, 2022 at 14:05

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