Example 2b – Migrate a UFS File System (Incremental) - Lift and Shift Guide – Migrating Application Data From Older SPARC Systems to Newer SPARC Systems

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Example 2b – Migrate a UFS File System (Incremental)

This example migrates an incremental subset of the data from a UFS file system to an already prepared ZFS or UFS file system.

This procedure is used in situations when there is a lapse between the time that the initial full dump is captured on the source and then restored on the target . If the source system remained in production, it is likely that data has changed on the source system. In such cases, you can perform an incremental dump and restore to migrate only the changed data to the target system.

Ensure that shared storage is prepared.
See Prepare Shared Storage.

From the source global zone, create an incremental copy of the UFS file system in a compressed format on shared storage.

The following examples show two types of incremental dumps. The difference between the examples is the way the source disk device is specified.

UFS running on SVM (raw disk specified)
Note – For the appropriate path to the pigz command, see the Secondary Commands table in Data Migration Commands.
```
root@Source# ufsdump 0cf - /dev/md/rdsk/d20 | pigz > /SharedStorage/redo.ufsdump.gz
```

UFS (raw physical disk specified)

Note – For the appropriate path to the pigz command, see the Secondary Commands table in Data Migration Commands.

root@Source# ufsdump 1cf - /dev/rdsk/c0t5000CCA0804092ECd0s6 | pigz > /SharedStorage/ufs1_ufsdump1.gz
DUMP: Date of this level 1 dump: Wed Sep 25 14:45:01 2019
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/rdsk/c0t5000CCA0804092ECd0s6 (opc-s02-s72-06:/ufs1) to standard output.
  DUMP: Mapping (Pass I) [regular files]
  DUMP: Mapping (Pass II) [directories]
  DUMP: Writing 63 Kilobyte records
  DUMP: Estimated 930 blocks (465KB).
  DUMP: Dumping (Pass III) [directories]
  DUMP: Dumping (Pass IV) [regular files]
  DUMP: 880 blocks (440KB) on 1 volume at 22000 KB/sec
  DUMP: DUMP IS DONE

From the target guest domain, uncompress and restore the incremental dump file.

The following examples show two types of incremental restores.

UFS running on SVM
Note – For the appropriate path to the pigz command, see the Secondary Commands table in Data Migration Commands.
```
root@Target# pigz -dc -f /SharedStorage/redo.ufsdump.gz | ufsrestore xvf -
```

UFS

Note – For the appropriate path to the pigz command, see the Secondary Commands table in Data Migration Commands.

root@Target# pigz -dc -f /SharedStorage/ufs1_ufsdump1.gz | ufsrestore xvf -
Verify volume and initialize maps
Dump   date: Wed Sep 25 14:45:01 2019
Dumped from: the epoch
Level 1 dump of /ufs1 on opc-s02-s72-06:/dev/dsk/c0t5000CCA0804092ECd0s6
Label: none
Extract directories from tape
Initialize symbol table.
Warning: ./lost+found: File exists
Extract requested files
extract file ./hosts
extract file ./nsswitch.conf
Add links
Set directory mode, owner, and times.
set owner/mode for '.'? [yn] y
Directories already exist, set modes anyway? [yn] n