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| Performing offline data verification | ||
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| Prev | Verifying the data on the Secondary | Next |
VVR enables you to verify whether the data on the Secondary is identical to the data on the Primary data volumes when the application is inactive. The vradmin syncrvg command with the -verify option verifies and reports any differences between the data volumes associated with the Secondary RVG and the corresponding Primary RVG. If a volume set is associated to the RDS, the vradmin -verify syncrvg command verifies only the component volumes that are associated to the RVG. The vradmin -verify syncrvg command only reports whether the Primary and Secondary volumes are identical or not. It does not make them identical. As the command runs, it reports the progress every 10 seconds. An MD5 checksum is used to calculate the difference between the Primary and the Secondary data volumes.
See Using difference-based synchronization.
To verify the differences between the Primary and Secondary data volumes
Use the following command to verify the differences between the Primary and Secondary data volumes
# vradmin -g diskgroup -verify syncrvg local_rvgname \
sec_hostname...
When this command is invoked, you are prompted to confirm that the Primary data volumes are not in use. You can use the -s option to skip this confirmation step.
The argument local_rvgname is the name of the RVG on the local host and represents the RDS.
The argument sec_hostname is a space-separated list of the names of the Secondary hosts as displayed in the output of the vradmin printrvg command.
This command checks the status of the Primary RLINK to each of the Secondary RVGs being verified. If any of the RLINKs are not up-to-date, the vradmin -verify syncrvg command returns with a message to indicate that the RLINKs are not up-to-date. In this scenario, verification is not be performed. Use the vxrlink status command to determine the extent to which the Secondary is behind.
To verify the data differences between the Primary RVG hr_rvg on seattle and the Secondary RVG on host london, issue the following command from any host in the RDS:
# vradmin -g hrdg -verify syncrvg hr_rvg london
The output resembles the following if the Primary and Secondary data volumes are identical: Message from Primary: VxVM VVR vxrsync INFO V-5-52-2210 Starting volume verification to remote VxVM VVR vxrsync INFO V-5-52-2211 Source host: 10.182.136.192 VxVM VVR vxrsync INFO V-5-52-2212 Destination host(s): 10.182.136.193 VxVM VVR vxrsync INFO V-5-52-2213 Total volumes: 1 VxVM VVR vxrsync INFO V-5-52-2214 Total size: 4.000 G Eps_time Dest_host Src_vol Dest_vol F'shed/Tot_sz Diff Done 00:00:00 10.182.136.193 hr_dv hr_dv 0M/4096M 0% 0% 00:00:10 10.182.136.193 hr_dv hr_dv 221M/4096M 0% 5% Message from Primary: 00:00:20 10.182.136.193 hr_dv hr_dv 468M/4096M 0% 11% Message from Primary: 00:00:30 10.182.136.193 hr_dv hr_dv 705M/4096M 0% 17% Message from Primary: 00:00:40 10.182.136.193 hr_dv hr_dv 945M/4096M 0% 23% Message from Primary: 00:00:50 10.182.136.193 hr_dv hr_dv 1184M/4096M 0% 29% Message from Primary: 00:01:00 10.182.136.193 hr_dv hr_dv 1419M/4096M 0% 35% Message from Primary: 00:01:10 10.182.136.193 hr_dv hr_dv 1655M/4096M 0% 40% Message from Primary: 00:01:20 10.182.136.193 hr_dv hr_dv 1886M/4096M 0% 46% Message from Primary: 00:01:30 10.182.136.193 hr_dv hr_dv 2124M/4096M 0% 52% Message from Primary: 00:01:40 10.182.136.193 hr_dv hr_dv 2356M/4096M 0% 58% 00:01:50 10.182.136.193 hr_dv hr_dv 2590M/4096M 0% 63% Message from Primary: 00:02:00 10.182.136.193 hr_dv hr_dv 2838M/4096M 0% 69% Message from Primary: 00:02:10 10.182.136.193 hr_dv hr_dv 3091M/4096M 0% 75% Message from Primary: 00:02:20 10.182.136.193 hr_dv hr_dv 3324M/4096M 0% 81% Message from Primary: 00:02:30 10.182.136.193 hr_dv hr_dv 3564M/4096M 0% 87% Message from Primary: 00:02:40 10.182.136.193 hr_dv hr_dv 3809M/4096M 0% 93% Message from Primary: 00:02:50 10.182.136.193 hr_dv hr_dv 4070M/4096M 0% 99% 00:02:51 10.182.136.193 hr_dv hr_dv 4096M/4096M 0% 100% VxVM VVR vxrsync INFO V-5-52-2217 The volumes are verified as identical. VxVM VVR vxrsync INFO V-5-52-2219 VxRSync operation completed. VxVM VVR vxrsync INFO V-5-52-2220 Total elapsed time: 0:02:51
If there are differences in the data volumes, the output looks similar to the one shown below:
Message from Primary: VxVM VVR vxrsync INFO V-5-52-2210 Starting volume verification to remote VxVM VVR vxrsync INFO V-5-52-2211 Source host: 10.182.136.192 VxVM VVR vxrsync INFO V-5-52-2212 Destination host(s): 10.182.136.193 VxVM VVR vxrsync INFO V-5-52-2213 Total volumes: 1 VxVM VVR vxrsync INFO V-5-52-2214 Total size: 4.000 G Eps_time Dest_host Src_vol Dest_vol F'shed/Tot_sz Diff Done 00:00:01 10.182.136.193 hr_dv hr_dv 0M/4096M 0% 0% 00:00:11 10.182.136.193 hr_dv hr_dv 231M/4096M 48% 6% Message from Primary: 00:00:21 10.182.136.193 hr_dv hr_dv 476M/4096M 23% 12% Message from Primary: 00:00:31 10.182.136.193 hr_dv hr_dv 719M/4096M 15% 18% Message from Primary: 00:00:41 10.182.136.193 hr_dv hr_dv 954M/4096M 12% 23% Message from Primary: 00:00:51 10.182.136.193 hr_dv hr_dv 1202M/4096M 9% 29% Message from Primary: 00:01:01 10.182.136.193 hr_dv hr_dv 1438M/4096M 8% 35% Message from Primary: 00:01:11 10.182.136.193 hr_dv hr_dv 1680M/4096M 7% 41% Message from Primary: 00:01:21 10.182.136.193 hr_dv hr_dv 1924M/4096M 6% 47% Message from Primary: 00:01:31 10.182.136.193 hr_dv hr_dv 2165M/4096M 5% 53% Message from Primary: 00:01:41 10.182.136.193 hr_dv hr_dv 2418M/4096M 5% 59% Message from Primary: 00:01:51 10.182.136.193 hr_dv hr_dv 2668M/4096M 4% 65% 00:02:01 10.182.136.193 hr_dv hr_dv 2906M/4096M 4% 71% Message from Primary: 00:02:11 10.182.136.193 hr_dv hr_dv 3140M/4096M 4% 77% Message from Primary: 00:02:21 10.182.136.193 hr_dv hr_dv 3386M/4096M 3% 83% Message from Primary: 00:02:31 10.182.136.193 hr_dv hr_dv 3630M/4096M 3% 89% Message from Primary: 00:02:41 10.182.136.193 hr_dv hr_dv 3881M/4096M 3% 95% Message from Primary: 00:02:49 10.182.136.193 hr_dv hr_dv 4096M/4096M 3% 100% VxVM VVR vxrsync INFO V-5-52-2218 Verification of the remote volumes found differences. VxVM VVR vxrsync INFO V-5-52-2219 VxRSync operation completed. VxVM VVR vxrsync INFO V-5-52-2220 Total elapsed time: 0:02:50