i have a question that dose all HDS storage (Enterprise and mid-range) Zero Block Reclaim functional? in case data deleted from hosts ,
is the data still can be retrieve or recover from storage side ?
Please note that the feature is zero page reclaim, because it reclaims whole pages, not individual blocks. Pages can be reclaimed if ALL bytes are zero ('\0', NULL). Simple deleted files cannot be reclaimed, you need to fill all blocks with NULL bytes before you can reclaim them.
You can reclaim free pages with VxFS (fsadm) or VMFS (VAAI) functionality. You could also reclaim them by filling file content with zeroes (wipe) before delete, but this scenario does not ensure reclamation because underlying filesystem structure.
Because pages must be zero-filled by host prior to storage reclamation, no user data is returned to pool (so, a new host that reuses the page will not see the old data). But, it's not a shredding
Zero block reclaim is done at the storage system level. The only exception to this is Microsoft Windows and it does not remove the data when files are deleted
but rather removes the reference. Windows has a utility called ‘sdelete’ which writes zeroes to the regions of disk where the data was deleted. Running a
Zero block reclaim for a volume attached to a windows host will work at the storage system however the recommendation is to run the ‘sdelete’ utility prior to
the zero block reclaim to achieve the best results.
Zero block reclaim works seamlessly with Linux, Solaris, AIX, HP-UX and VMWare
by the way its functional on enterprise storages only and not on the HUS100 family ,
Retrieving data ...