由于使用 nbd 而不是 hotadd，Avamar 虚拟机映像备份有时需要更长的时间才能完成

Summary: 由于使用 nbd 而不是 hotadd，Avamar 虚拟机映像备份有时需要更长的时间才能完成。

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Symptoms

Avamar VMware 映像备份完成时间不一致。

有时备份会快速完成。 
2017-09-21 05:15:08 avtar Info <5156>: Backup #223 timestamp 2017-09-21 05:15:08, 0 files, 925.0 GB (0 files, 352.2 GB, 38.07% new)
2017-09-21 05:15:08 avtar Info <6083>: Backed-up 925.0 GB in 192.63 minutes: 288 GB/hour (0 files/hour)
2017-09-21 05:15:08 avtar Info <7883>: Finished at 2017-09-21 05:15:08 CEST, Elapsed time: 0003h:12m:37s

在“缓慢”的日子里，备份需要更长的时间。以下一项需要 24 小时。 
2017-09-23 02:10:04 avtar Info <5156>: Backup #224 timestamp 2017-09-23 02:10:04, 0 files, 925.0 GB (0 files, 334.5 GB, 36.16% new)
2017-09-23 02:10:04 avtar Info <6083>: Backed-up 925.0 GB in 1447.94 minutes: 38 GB/hour (0 files/hour)
2017-09-23 02:10:04 avtar Info <7883>: Finished at 2017-09-23 02:10:04 CEST, Elapsed time: 0024h:07m:56s

备份具有相似的大小和更改率。两者都以“合成完整”运行。日志指示较快的备份使用“hotadd” 
2017-09-21 02:03:06 avvcbimage Info <0000>: Connected with hotadd transport to virtual disk [XXXXX] XXXXXXXX.vmdk. Time to connect: 35082 msecs
速度较慢的备份报告使用 hotadd 连接时出现问题。它会回退到使用 nbd。 
2017-09-22 02:13:22 avvcbimage Info <12006>: hotadd transport is recommended for faster backups and restores and less exposure to network routing, firewall and SSL certificate issues. 
2017-09-22 02:13:22 avvcbimage Info <12007>: One or more of these items may be preventing use of hotadd transport with this VM: 
2017-09-22 02:14:03 avvcbimage Info <12013>: Check that the VM being backed up is in the same datacenter as the backup proxy VM. Hotadd transport cannot cross a Datacenter boundary. . . . 
2017-09-22 02:13:22 avvcbimage Info <0000>: Connected with nbd transport to virtual disk [XXXXX] XXXXXXX.vmdk. Time to connect: 353256 msecs

Cause

每天，备份都使用不同的代理。

快速备份： 
2017-09-21 02:00:09 avvcbimage Info <18672>: proxy VM Instance name is: xxxxx-proxy-8 

备份速度较慢： 
2017-09-22 02:00:15 avvcbimage Info <18672>: proxy VM Instance name is: xxxxx-proxy-2 
9 月 21 日使用的代理在 9 月 22 日不可用。
备份使用了另一个代理，该代理存在配置问题。
使用此不同的代理时，它无法利用更快的“hotadd”传输模式。

Resolution

如果无法使用 hotadd 传输，日志会建议执行哪些检查。

如果尚未更改虚拟机配置，请检查与代理相关的配置检查。
  
2017-09-22 02:13:22 avvcbimage Info <12007>: One or more of these items may be preventing use of hotadd transport with this VM:
2017-09-22 02:14:03 avvcbimage Info <12008>:  Check that the backup proxy VM(127.0.0.2,xxxx-avpro4,10.10.8.53,10.10.7.53) is deployed on an ESX(i) host that has a path to the storage holding the virtual disk being backed up ([XXXXXXXX] XXXXX.vmdk). Also check that the proxy is configured to protect this datastore
2017-09-22 02:14:03 avvcbimage Info <12009>:  Check that the vmfs holding the backup proxy VM has a total capacity equal to the size of the largest virtual disk being backed up. (Capacity merely has to be present - Free space can be less than this amount)
2017-09-22 02:14:03 avvcbimage Info <12010>:  Check that the vmfs holding the backup proxy VM is formatted with a vmfs block size which supports the size of the largest virtual disk being backed up
2017-09-22 02:14:03 avvcbimage Info <12011>:  Check that the VM being backed up has no virtual hard disks designated as independent
2017-09-22 02:14:03 avvcbimage Info <12012>:  Check that the VM being backed up has no IDE virtual hard disks, usually an artifact of a P2v conversion - use SCSI virtual disks instead
2017-09-22 02:14:03 avvcbimage Info <12013>:  Check that the VM being backed up is in the same datacenter as the backup proxy VM. Hotadd transport cannot cross a Datacenter boundary.
2017-09-22 02:14:03 avvcbimage Info <12014>:  Check that no VMs, and no vmdk's within the vCenter have the same name as those associated with the VM being backed up. (unusual but possible)

Additional Information

有关可能的传输模式的更多信息，请参阅：
https://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vddk.pg.doc_50%2FvddkDataStruct.5.5.html

Affected Products

Avamar

Products

Avamar, Avamar Client for VMware
Article Properties
Article Number: 000046189
Article Type: Solution
Last Modified: 06 Feb 2025
Version:  6
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