Free 1Z0-027 Braindumps


  • Exam Number: 1Z0-027
  • Provider: Oracle
  • Questions: 72
  • Updated On: 17-Nov-2018

QUESTION: 1
To troubleshoot a possible hardware problem, you consider moving all disk drives from one
Exadata storage server to a replacement chassis.

You must contain storage availability while performing task.

The Exadata storage server is an X3-8 Database Machine and storage grid is not partitioned.

Which two factors would prevent you from moving the disks from one Exadata storage server to
another one?

A. The existence of an external redundancy ASM diskgroup
B. The existence of a normal redundancy ASM diskgroup
C. The existence of an ASM diskgroup with the repair_time attribute set to 0.
D. The existence of an ASM diskgroup with its compatible.asm attribute set to 10.2.0.0.0
E. Offline or inactive celldisks in another Exadata server

Answer(s): A, D
Explanation:
A: If you want Oracle ASM to mirror files, specify the redundancy level as NORMAL
REDUNDANCY (2-way mirroring by default for most file types) or HIGH REDUNDANCY (3-way
mirroring for all files). You specify EXTERNAL REDUNDANCY if you do not want mirroring by
Oracle ASM. For example, you might choose EXTERNAL REDUNDANCY if you want to use
storage array protection features.

D: Restoring the redundancy of an Oracle ASM disk group after a transient disk path failure can
be time consuming. This is especially true if the recovery process requires rebuilding an entire
Oracle ASM failure group. Oracle ASM fast mirror resync significantly reduces the time to
resynchronize a failed disk in such situations. When you replace the failed disk, Oracle ASM
can quickly resynchronize the Oracle ASM disk extents.

To use this feature, the disk group compatibility attributes must be set to 11.1 or higher.

Incorrect:
Not C: You can set the DISK_REPAIR_TIME disk group attribute to delay the drop operation by
specifying a time interval to repair the disk and bring it back online.

Note:
* The redundancy levels are:

/ External redundancy

Oracle ASM does not provide mirroring redundancy and relies on the storage system to provide
RAID functionality. Any write error cause a forced dismount of the disk group. Al disks must be
located to successfully mount the disk group.

/ Normal redundancy

Oracle ASM provides two-way mirroring by default, which means that all files are mirrored so
that there are two copies of every extent. A loss of one Oracle ASM disk is tolerated. You can
optionally choose three-way or unprotected mirroring.
2

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