由於使用 nbd 而非 hotadd，Avamar VM 映像備份有時需要較長的時間才能完成

Summary: 由於使用 nbd 而非 hotadd，Avamar VM 映像備份有時需要較長的時間才能完成。

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Symptoms

Avamar VMware 映像備份的完成時間不一致。

有時備份會快速完成。 
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“慢”的日子里，備份需要更長的時間。以下一個需要 24 小時。 
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

備份的大小和變更率相似。兩者都以「合成完整」運行。記錄顯示更快的備份速度是使用「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
較慢的備份報告使用hotadd連接時發生問題。它回退到使用 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

備份每天都使用不同的代理。

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

備份速度較慢： 
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。
備份使用不同的代理，存在配置問題。
使用此不同的代理時，它無法利用更快的「hotadd」傳輸模式。

Resolution

記錄會建議在無法使用熱新增傳輸時的檢查項目。

如果 VM 組態尚未變更，請檢查代理相關的組態檢查。
  
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

如需更多有關可能的傳輸模式的資訊，請參閱：
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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