Category Archives: ZFS

ONSITE DATA RECOVERY SERVICE WITH GROUP DISCOUNT IN Guelph and Fergus

Data Care Clinic, as a member of The Guelph Chamber of Commerce, provides onsite data recovery service and technical support for data security and data management in Guelph and Fergus with group discount for member of The Guelph Chamber of Commerce.

OnSite Data Recovery Service with Group Discount in Kitchener, Waterloo and Cambridge

Data Care Clinic, as a member of The Greater Kitchener Waterloo Chamber of Commerce, provides onsite data recovery service and technical support for data security and data management in Kitchener, Waterloo and Cambridge with group discount for member of The Greater Kitchener Waterloo Chamber of Commerce.

Extract folders from ZFS NAS Snapshots

Snapshots form the basis of data management and data security. Understanding them and knowing how to use them are crucial to successful file system administration as this is a crucial part of helping to protect and recover your data.

A friend saw one checksum error coming from the mirrored SSD root boot pool on his ZFS NAS (RAID-Z2).  He tried to fix the problem himself since he knew that unresolved storage errors can lead to bigger problems later. He has created multiple snapshots of the file system after various file system events.

Instead of creating a writable clone of the file system from any of the snapshots, he used snapshots to create an incremental backup of the file system. Before restoring the backup, he inspected snapshots and the backup contents via assessing which files were modified between the last snapshots to recover any or all of the data that had snapshotted and backed up. He could not receive incremental stream since destination has been modified. Error appeared while committing the restoration.

After checked the status of his pool and its component devices, Data Care Clinic told him if he actually lost any data due to the damage, and which files were lost.  We can go snapshot directory and restore files needed using normal cp command to copy data to a destination drive. Besides restoring individual files from snapshot, one can roll back the whole FS to the previously taken snapshot. It is quick and easy since no need to create a writable clone of the file system from any of the snapshots.