After upgrading to NetBackup 7.6.1/7.6.1.1 VMware Snapshots are intermittently hanging on Windows VMware Backup Host

Problem

After upgrading to NetBackup 7.6.1 or 7.6.1.1, VMware Snapshots are intermittently hanging, either during snapshot creation or during snapshot deletion on a Windows VMware Backup Host.

Error Message

Last few calls in bpfis before the hang occurs:
Snapshot Create:
14:16:19.234 [144.3576] <2> onlfi_vfms_logf: INF - VMware VixDiskLib (5.5) Release build-2454786
14:16:19.327 [144.3576] <2> onlfi_vfms_logf: INF - lockVM: Calling VixDiskLib_PrepareForAccess
14:16:19.327 [144.3576] <2> onlfi_vfms_logf: INF - VixDiskLib: VixDiskLib_PrepareForAccess: Prepare to access disk.
14:16:19.327 [144.3576] <2> onlfi_vfms_logf: INF - VixDiskLib: VixDiskLib_Connect: Establish connection.
14:16:19.327 [144.3576] <2> onlfi_vfms_logf: INF - VixDiskLibVim: VixDiskLibVim_AllowVMotion: Disable VMotion.
14:16:19.327 [144.3576] <2> onlfi_vfms_logf: INF - HOSTINFO 1793197508169 @ 2922392Hz -> 0 @ 1000000000Hz
14:16:19.327 [144.3576] <2> onlfi_vfms_logf: INF - HOSTINFO ((x * 2870459541) >> 23) + -613606082942620
14:16:19.390 [144.2944] <2> onlfi_vfms_logf: INF - VThreadBase detected multiple threads.
14:17:08.015 [144.1276] <2> send_keep_alive: INF - sending keep alive

Snapshot Delete:
10:04:49.502 [9220.9624] <2> onlfi_vfms_logf: INF - unlockVM: Calling VixDiskLib_EndAccess
10:04:49.502 [9220.9624] <2> onlfi_vfms_logf: INF - VixDiskLib: VixDiskLib_EndAccess: Disk access completed.
10:04:49.502 [9220.9624] <2> onlfi_vfms_logf: INF - VixDiskLib: VixDiskLib_Connect: Establish connection.
10:04:49.502 [9220.9624] <2> onlfi_vfms_logf: INF - VixDiskLibVim: VixDiskLibVim_AllowVMotion: Enable VMotion.
10:04:49.503 [9220.9624] <2> onlfi_vfms_logf: INF - HOSTINFO 1022764460068 @ 3092509Hz -> 0 @ 1000000000Hz
10:04:49.503 [9220.9624] <2> onlfi_vfms_logf: INF - HOSTINFO ((x * 2712557344) >> 23) + -330723195950943
10:04:49.511 [9220.9792] <2> onlfi_vfms_logf: INF - VThreadBase detected multiple threads.
10:05:35.460 [9220.6236] <2> send_keep_alive: INF - sending keep alive

Cause

There was a problem with the method use to initialize VDDK.

Solution

The formal resolution for this issue (Etrack 3735612) is included in the following release:

• NetBackup 7.6.1 Maintenance Release 2 (7.6.1.2)

NetBackup 7.6.1.2 is now available - download and README information can be found in the Related Article.

Workaround:
A hotfix is attached to this document for NetBackup 7.6.1.1.

Note: This hotfix is no longer publicly available, as all of its fixes are included in NetBackup 7.6.1.2.  If this issue is experienced, the supported resolution is to apply the latest maintenance release.

Hotfix Information:

Veritas Bug ID: ET 3735610

Version:  NetBackup_7.6.1.1

Installation Location:  VMware backup host

Installation Instructions: Please follow the EEB Installer instructions available at https://www.veritas.com/docs/000035801.

Checksums:
1902462011 281088 AMD64/libonline_util.dll
1773500627 771584 AMD64/bpVMutil.exe
1003953249 520192 AMD64/libfi_VMware.dll
4227154906 262144 AMD64/bppfi.exe

Recommended service state: Ensure that no backups are taking place while installing this EEB.

Etrack : 3735612