Modifying a storage type – Dell Compellent Series 40 User Manual
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Non-Standard Storage Types
5 Select Non-Redundant or Redundant.
•
Non-Redundant storage uses RAID 0. Data is striped but provides no redundancy. If
one disk fails, all data is lost. Do not use non-redundant storage for a volume unless the
data is backed-up elsewhere.
•
Redundant storage may be either Single Redundant or Dual Redundant, depending
upon your tier redundancy configuration and disk size. For disks that are 900GB or
greater in size, that tier and all tiers below it default to dual redundant storage.
•
Single-redundant storage protects against the loss of any one drive.
•
RAID 10 (each disk is mirrored)
•
RAID (5-5 striped across 5 drives)
•
5-9 (striped across 9 drives)
•
Dual-redundant storage protects against the loss of any two drives:
•
RAID 10 Dual-Mirror (data is written simultaneously to three separate disks. )
•
RAID 6-6 (4 data segments, 2 parity segments per stripe)
•
RAID 6-10 (8 data segments, 2 parity segments per stripe)
6 Select the datapage size to be used. It is recommended that you only prepare a disk
folder for a single datapage size to optimize disk utilization and I/O performance. Only
prepare for additional types of storage to address specific application needs.
•
2 MB: The default datapage size, this selection is appropriate for most application
needs.
•
512 KB: This datapage size is appropriate for applications with high performance
needs, or environments in which Replays are taken frequently under heavy I/O.
Selecting this size reduces the amount of space the System Manager can present to
servers.
•
4 MB: This datapage size is appropriate for systems that use a large amount of disk
space with infrequent Replays.
Caution
If you are considering using either the 512 KB or 4 MB datapage setting, contact
Dell Support Services so that system resources remain balanced and the impact
on performance is considered.
7 Click Prepare Now. The disk folder is prepared for the selected type of storage. It is not
used until a volume is created with that Storage Type. The System Manager asks if you
want to Prepare for Additional Storage Type or Close.
8 Click Close.
Modifying a Storage Type
Note
You can modify a non-standard Storage Type only if your User Volume Defaults
permit you to do so.
1 In the Configure Storage window shown in
, select Modify
Storage Type. The Modify Storage Type window appears.