當還原的檔案路徑超過最大路徑長度限制 （MAX_PATH） 時，Windows VMware 檔案層級還原 （FLR） 會失敗

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Symptoms



檔案層級還原工作在某些目錄路徑上失敗，並伴有深度遞迴。      FLR 記錄會顯示一般錯誤記錄 

  
--------------------------------------------------------------------------------------------------------
-----  START avvmwfile log <timestamp> UTC  [18.2.100-134 Linux-x86_64]
--------------------------------------------------------------------------------------------------------

<timestamp> avvmwfile Info <5008>: Logging to /usr/local/avamarclient/var/MOD-1565970042058-<cid>-3019-vmwfilew.log
<timestamp> avvmwfile Info <5174>: - Reading /usr/local/avamarclient/var/avvmwfile.cmd
<timestamp> avvmwfile Info <5174>: - Reading /usr/local/avamarclient/var/avvmwfileAll.cmd
<timestamp> avvmwfile Info <6673>: CTL listening on port 34258
<timestamp> avvmwfile Info <10684>: Setting ctl message version to 3 (from 1)
<timestamp> avvmwfile Info <16136>: Setting ctl max message size to 268435456
<timestamp> avvmwfile Info <5174>: - Reading /usr/local/avamarclient/var/avvmwfile.cmd
<timestamp> avvmwfile Info <5174>: - Reading /usr/local/avamarclient/var/avvmwfileAll.cmd
<timestamp> avvmwfile Info <19660>: targetlist contains <dir backup="true" date="1969-01-01 00:00:00" internal="0" group="unknown" protection="drwx------" name="C:/DFS_Shares/Users/Bob" size="65536" saveas="C:/DFS_Shares/users/restore" user="unknown" />

<timestamp> avvmwfile Error <0000>: Failed to restore files via network, check proxy log for details
<timestamp>  avvmwfile Error <0000>: assist_restore error. ret: 157

--------------------------------------------------------------------------------------------------------
----- END avvmwfile log <timestamp> UTC  (0 warnings, 2 errors, 0 fatal errors)
--------------------------------------------------------------------------------------------------------

 

Cause

在虛擬機內部，Microsoft視窗配置了具有非常深的檔樹結構的 DFS（分散式文件系統）。  

還原至原始位置還原選項時，我們會在代理上看到 FLR 指令檔記錄 （/usr/local/avamarclient/bin/logs/flr*.err） 如下：
  
>file name: file1.txt
>file name: files2 
>file name: <long-file>-example.txt
>fail to create file  C:\DFS_Shares\users\restore\folder1\folder2\folder3\....< file length bigger than 260 characters>-example.txt  error code:2
問題：已超過路徑長度上限 （MAX_PATH）。  默認情況下，此限制為 260，如果保存位置和檔名路徑的組合超過 260 個字元


，則會導致還原檔創建問題 此Microsoft頁面上提供了更多資訊： https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file

“在 Windows API 中（以下段落中討論了一些例外），路徑的最大長度為 MAX_PATH，定義為 260 個字元。
本地路徑按以下順序構建：驅動器號、冒號、反斜杠、用反斜杠分隔的名稱元件以及終止 null 字元”

Resolution


1.在較新的 Windows 作業系統 （Windows 10 版本 1607 及更新版本） 中，啟用啟用長路徑。     
下列 Microsoft 知識文章有指示：https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file

或

2。執行重新導向的還原至較短的目錄路徑，而非還原至原始位置。
範例：c：\restore\ 這將減少整體檔案路徑  

Affected Products

Avamar

Products

Avamar, Avamar Client for VMware
Article Properties
Article Number: 000053607
Article Type: Solution
Last Modified: 09 Oct 2024
Version:  3
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