Data integrity is provided through which two features?
A.
Enhanced version of UFS
B.
Copy-on-write operations
C.
Parallel reads and writes to the same file
D.
Memory-based, end-to-end checksumming
Explanation:
B:ZFS use Copy-On-Write, which means old data is not altered. Whenever data is
edited and updated, the old data is always left intact, and only the edits are stored, on a new place
on the disk. This means every change can be traced back in time. This allows the user to discard
thelatest change which caused the problem, and instead go back to an earlier functioning state.
This is also how ZFS Snapshots works.D:To maximize the availability of your data in production, Sun ZFS Storage appliances include
acomplete end-to-end architecture for data integrity, including redundancies at every level of the
stack. Key features include:
*the ZFS file system provides memory-based end-to-end dataand metadata checksumming with
self-healing capabilities to fix potential issues.
Note:ZFS is a combined file system and logical volume manager designed by Sun Microsystems.
The features of ZFS include data integrity verification against data corruption modes, support for
high storage capacities, integration of the concepts of filesystem and volume management,
snapshots and copy-on-write clones, continuous integrity checking and automatic repair, RAID-Z
and native NFSv4 ACLs.
One major feature that distinguishes ZFS from other file systems is that ZFS is designed from the
ground up with a focus on data integrity. That is, protect the user’s data on disk, against silent data
corruption caused by e.g., bit rot, current spikes, bugs in disk firmware, ghost writes, etc.
Reference:Sun Storage 7000Unified Storage System,Just the Facts