启用了保证复制的 DLm VTE 会导致磁带装载挂起

DLm virtuent 应用程序会读取 Data Domain 报告文件，以确定某个目录是否标记为符合保证复制的条件，并允许在这些目录上执行 GR 活动。  

01/04/2022 17:45:09 vte2 VT: DLm0409I: Command received: 'SET GR=YES'
01/04/2022 17:45:09 vte2 VT: DLm0160I: All devices Guaranteed Replication set to YES
01/04/2022 17:47:17 vte2 VT: DLm0405I: Device 0295 Display: 'KA14425 ' 'MPRIVATS' (blink) (alternating)
01/04/2022 17:47:18 vte2 VT: DLm0527W: Device 0295 unable to allocate an SL PRIVAT volume: none available(CLASS=CLASS0) (GR)
01/04/2022 17:47:18 vte2 VT: DLm0489E: Device 0295 Error loading volume 'PRIVAT' - no available (CLASS=CLASS0) on replicating FS
01/04/2022 17:47:18 vte2 VT: DLm0487I: Device 0295 volume PRIVAT mount will be retried

...
对于为受影响的磁带库目录启用了 GR 的所有驱动器的所有磁带装载，此模式将继续。  如果为所有 VTE 设备配置了 GR，这会导致数据不可用的情况。

在受影响的 VTE 上运行的 Virtuent/vtd 认为所有 GR 目录都不符合保证复制的资格。

Virtuent/vtd“缓存”或维护来自 /opt/DLm/DD-1/dlmconfig/ddReport.txt 的 DD 报告文件的本地拷贝。
该文件会定期读取，并且 virtuent 拷贝会更新。  在这种情况下，virtuent 应用程序读取文件一次，并且未更新其拷贝。由于 ddReport.txt 副本过时，vtd 认为没有“符合”保证复制的内容

之前发生过（保证）复制错误，导致 Virtuent 创建复制同步错误文件并伴随错误 DLm0548E。  存在 virtuent 创建的该错误文件的情况下，受影响的磁带库目录的后续 GR 请求失败。  在某些时候，virtuent 会删除 /opt/DLM/DD-1|2/dlmconfig/.GR 中的错误文件，但失败的复制状态保留在 virtuent 中，直到通过 config install 或 vtd restart 更新 ddreport 的缓存拷贝


2021-10-07T16:13:30.341623-05:00 vte1 dlm_gr[61516]: DLmTools:I: Started processing request for source {data/col1/D0010}: /opt/DLm/DD-1/dlmconfig/.GR/dd1s:#@,data#@,col1#@,D0010#@,tapelibD0010#@,DD1_P1_FS7 vte2.0204.A07961.1633641209
2021-10-07T16:13:30.341715-05:00 vte1 dlm_gr[61516]: DLmTools:I: Synchronizing data/col1/D0010...
2021-10-07T16:13:30.341795-05:00 vte1 dlm_gr[61516]: DLmTools:I: DD : started replication sync mtree://CDC-8500..com/data/col1/D0010
2021-10-07T16:15:30.385659-05:00 vte1 dlm_gr[61516]: DLmTools:E: Error: Command replication sync mtree://CDC-8500..com/data/col1/D0010 failed
2021-10-07T16:15:30.386074-05:00 vte1 dlm_gr[61516]: DLmTools:E: Error: Error: DD command returned rcode 255
2021-10-07T16:15:30.386158-05:00 vte1 dlm_gr[61516]: DLmTools:E: -------------------
2021-10-07T16:15:30.386235-05:00 vte1 dlm_gr[61516]: DLmTools:E: Connection to dd1 closed by remote host.
2021-10-07T16:15:30.386311-05:00 vte1 dlm_gr[61516]: DLmTools:E: -------------------
2021-10-07T16:15:30.386390-05:00 vte1 dlm_gr[61516]: DLmTools:E: Error: failed to sync replication session mtree://CDC-8500..com/data/col1/D0010. RC: 255. Output:#012Connection to dd1 closed by remote host.
2021-10-07T16:15:30.386464-05:00 vte1 dlm_gr[61516]: DLmTools:E: Error: failed to sync data/col1/D0010 to mtree://CDC-8500..com/data/col1/D0010: 2
2021-10-07T16:15:30.445644-05:00 vte1 dlm_gr[61516]: DLmTools:I: Info: Creating error file '/opt/DLm/DD-1/dlmconfig/.GR/error dd1s:#@,data#@,col1#@,D0010#@,tapelibD0010#@,DD1_P1_FS1 vte1.0131.B95896.1633641209'
2021-10-07T16:15:30.450184-05:00 vte1 dlm_gr[61516]: DLmTools:I: Info: Deleting original replication request file '/opt/DLm/DD-1/dlmconfig/.GR/dd1s:#@,data#@,col1#@,D0010#@,tapelibD0010#@,DD1_P1_FS1 vte1.0131.B95896.1633641209'
2021-10-07T16:15:30.756688-05:00 vte1 dlm_gr[61516]: DLmTools:I: Info: Creating error file '/opt/DLm/DD-1/dlmconfig/.GR/error dd1s:#@,data#@,col1#@,D0010#@,tapelibD0010#@,DD1_P1_FS7 vte2.0204.A07961.1633641209'
2021-10-07T16:15:30.760731-05:00 vte1 dlm_gr[61516]: DLmTools:I: Info: Deleting original replication request file '/opt/DLm/DD-1/dlmconfig/.GR/dd1s:#@,data#@,col1#@,D0010#@,tapelibD0010#@,DD1_P1_FS7 vte2.0204.A07961.1633641209'
2021-10-07T16:15:30.767417-05:00 vte1 dlm_gr[61516]: DLmTools:E: Error: failed to sync data/col1/D0010
2021-10-07T16:15:30.822095-05:00 vte1 dlm_gr[73147]: DLmTools:E: master: child 61516 failed to sync repl data/col1/D0010 with code 2, signal 0
2021-10-07T16:15:31.032082-05:00 vte1 dlm_gr[67633]: DLmTools:I: Started processing request for source {data/col1/D0010}: /opt/DLm/DD-1/dlmconfig/.GR/dd1s:#@,data#@,col1#@,D0010#@,tapelibD0010#@,DD1_P1_FS5 vte1.0127.C08798.1633641321

自本文撰写之时（2022 年 1 月）开始，此问题将在以后的 DLm 代码版本中修复。  

临时解决办法是，vtd stop/vtd start 将允许 GR 激活
可通过以下工具发出 vtd stop / vtd start 命令：

DLm System Manager；命令界面
Putty / 命令行