Which three statements are true regarding ACFS snapshots in Oracle 12c ASM?http://www.gratisexam.com/
A.
They are contained in a directory on the same volume as their parent file system.
B.
All ACFS snapshot operations for all filesystem are serialized clusterwide.
C.
You can create a snapshot from an existing snapshot.
D.
They can be administered using ASMCMD.
E.
They can only be accessed when the file system is mounted.
F.
They are always point-in-time copies of the parent file system.
Explanation:
All Oracle ACFS snapshot operations are serialized clusterwide in the kernel.
You chose to create a snapshot image on an existing snapshot group, select a snapshot group from the existing snapshot group table (make sure you select a
snapshot group that has not reached its maximum limit of snapshot images).
Before you can access the files on a file system, you need to mount the file system.
References:
https://docs.oracle.com/database/121/OSTMG/GUID-5A3EF695-A795-4FEA-8BE2-AF657BD2238C.htm#OSTMG33000
http://mysupport.netapp.com/NOW/public/eseries/amw/index.html#page/SANtricity_v11.20_Array_Management_Window_Help/create_PIT_image.html (Creating a
Snapshot image 3rd point, 1st line).
https://docs.oracle.com/cd/E19455-01/805-7228/6j6q7ueup/index.html (1st paragraph, 1st line).
An Oracle ACFS snapshot is an online, read-only or read-write, point in time copy of an
Oracle ACFS file system.
They are always online while the file system is mounted.
Require the disk group compatibility attribute for ADVM set to 11.2.0.3.0 or higher
Existing snapshots can be used as the source for a new snapshot.
Before an Oracle ACFS file extent is modified or deleted, its current value is
copied to the snapshot to maintain the point-in-time view of the file system.
I think C,E & F (not B)
All Oracle ACFS snapshot operations are serialized clusterwide in the kernel.
(https://docs.oracle.com/database/121/OSTMG/GUID-5A3EF695-A795-4FEA-8BE2-AF657BD2238C.htm#OSTMG33000)
Correct Answer is : BCE
Hi Prashant
you are right BCE correct
All Oracle ACFS snapshot operations are serialized clusterwide in the kernel. For example, if a snapshot create operation is initiated at the same time as a snapshot delete operation, then both operations would complete, but they would not run in parallel inside of the kernel. One operation would complete before the other was started.
https://docs.oracle.com/database/121/OSTMG/GUID-5A3EF695-A795-4FEA-8BE2-AF657BD2238C.htm#OSTMG33000
Agree, BCE
A) I think that this is wrong:
About Oracle ACFS Snapshots
Oracle ACFS snapshots are immediately available for use after they are created. The snapshots are created in the .ACFS/snaps/ directory of the file system.
Help me with the term “parent file system” please!
B) Is correct
All Oracle ACFS snapshot operations are serialized clusterwide in the kernel. For example, if a snapshot create operation is initiated at the same time as a snapshot delete operation, then both operations would complete, but they would not run in parallel inside of the kernel. One operation would complete before the other was started.
C) Is correct
Existing snapshots can be used as the source for a new snapshot.
…
You can create a snapshot from an existing snapshot in the same Oracle ACFS file system.
D) This is wrong
Oracle ACFS snapshots are administered with the acfsutil snap commands. For information about the acfsutil snap commands, refer to “acfsutil snap create”, “acfsutil snap delete”, and “acfsutil snap info”.
E) Correct
About Oracle ACFS Snapshots
Oracle ACFS snapshots are immediately available for use after they are created. The snapshots are created in the .ACFS/snaps/ directory of the file system. They are always online while the file system is mounted
F) I think that this is wrong
Help me with the term “parent file system” please! This is one directory above?
An Oracle ACFS snapshot is an online, read-only or read-write, point in time copy of an Oracle ACFS file system.
“parent file system” refers to the file system from which the snapshot was created.
Then the only wrong is “D”! Are alright?
Unless…
A)
“They are contained in a directory on the same volume as their parent file system”
“They are contained in a directory of a parent file system therefore in the same volume”
F)
“They are always point-in-time copies of the parent file system.”
“They are always point-in-time copies of the parent file system or copies from the another snapshot”.
As I see it, ACE must be true. B could be wrong if snapshot operations are not serialized across all filesystems, but only within each filesystem.
Volker… “Serialized” or “parallelized”, they are made one by time!
I think is A,C,E
The correct statement is snapshot operations are serialized for one filesystem not all filesystems. So B is wrong.
BCE is not correct for sure.
I just returned from Exams and i got this question. In feedback , i was said that i got this ans wrong.
I’ll rather suggest ACE