Solved

Why is that? Preservation capacity on the MD3620i

Posted on 2013-02-03
3
2,467 Views
Last Modified: 2016-11-23
Within disk pool (DDP) thin volumes have been created.  

When the disk pool is created 2 disk are automatically assigned for preservation capacity.
Total capacity:
5,404.000 GB
Preservation capacity:
1,112.000 GB(2 Physical Disks)
Usable capacity:
4,292.000 GB
Unusable capacity:
0.000 MB


But as volumes are added the storage manager keeps asking to add preservation capacity to each volume for rebuilding operation.  I don't get it.   Please help me to clear the things up here I should have missed something.  

from Dell documentation:

Preservation Capacity – This attribute specifies the number of drives to reserve
in a disk pool for the reconstruction process in addition to the reserved
reconstruction space reserved on each drive. The default for this parameter is 1.
0
Comment
Question by:quadrumane
  • 2
3 Comments
 
LVL 20

Accepted Solution

by:
agonza07 earned 500 total points
ID: 38849943
Think about it as your spare drives in order to recover from a failed RAID drive.


Configuring The Preservation Capacity Of A Disk Pool
 
The preservation capacity in a disk pool is reserved for data reconstruction operations in case of physical disk failures.
 
To configure the preservation capacity in a disk pool:
 
1. In AMW, select the Storage & Copy Services tab.
 2. Select the disk pool.
3.From the menu bar, select Storage ¿ Disk Pool ¿ Change ¿ Settings.
 The Change Disk Pool Settings dialog is displayed.
 4.In the Preservation Capacity area of the Physical disks dedicated to preservation capacity box, type or select a number of physical disks.
 
The preservation capacity of the disk pool is dependent on the number of physical disks in the disk pool.
 5.Click OK.
0
 

Author Comment

by:quadrumane
ID: 38850925
The default settings on the MD would take as much as almost half the available capacity for this "hot spare drives".   As far as I know conventional RAID models don't have 6 or 7 hot spares.
0
 
LVL 20

Expert Comment

by:agonza07
ID: 38851175
From your quote on the original posting the default is 1 drive.

And from your original comment it's only taking up 2.

Not sure where you are getting 6 or 7, but please post a screenshot or configuration settings of what you mean. Make sure to include your current RAiD config.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Ever notice how you can't use a new drive in Windows without having Windows assigning a Disk Signature?  Ever have a signature collision problem (especially with Virtual Machines?)  This article is intended to help you understand what's going on and…
AWS Glacier is Amazons cheapest storage option and is their answer to a ‘Cold’ storage service.  Customers primarily use this service for archival purposes and storage of infrastructure backups.  Its unlimited storage potential and low storage cost …
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This tutorial will walk an individual through the process of installing the necessary services and then configuring a Windows Server 2012 system as an iSCSI target. To install the necessary roles, go to Server Manager, and select Add Roles and Featu…

910 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now