Appliance Mode - Failed to hot-add SCSI targets: Failed to power on scsi

KB ID: 1052
Product: Veeam Backup & Replication
Version: 5.x
Published: 2011-07-19
Last Modified: 2020-08-13
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Challenge

Appliance Mode fails with the error: 

[timestamp] <17> Info           [AP] (Client) output: [2011-03-10 06:25:20.868 02600 verbose 'transport'] Mounting VM vim.VirtualMachine:vm-172 using transport hotadd failed : Failed to hot-add SCSI targets: Failed to power on scsi0:x.\n
[timestamp] <17> Info           [AP] (Client) output: Failed to add disk scsi0:8..\n

Cause

1. Typically this means VMFS blocksize of datastore that stores the Veeam virtual machine is smaller than what is supported for disk that is mounting to Veeam Console for backup. 


Block Size
Largest virtual disk on VMFS-2
Largest virtual disk on VMFS-3
1MB
456GB
256GB
2MB
912GB
512GB
4MB
1.78TB
1TB
8MB
2TB
2TB

2. Sometimes this error can be seen when the backed up machine has two or more equally named disks.

Solution

1. Simply use the largest VMFS blocksize datastore in your infrastructure to house the Veeam virtual machine.  This guarantees that no disk in your environment will be too large for the datastore to support this hotadd mount of that disk.

2. Rename the disks and re-create the job:

http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1002491&sliceId=2&docTypeID=DT_KB_1_1&dialogID=164036717&stateId=1%200%20164040343
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