System Disks; Hot Spare - Fujitsu Eternus DX60 User Manual

Disk storage system
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Chapter 1 Overview
>
1.2 Configuration
• Table 1.5
Table 1.5
RAID level
RAID1
RAID1+0
RAID5
RAID5+0
RAID6
*1:
No more than 8TB can be used for any one volume. However, the maximum allowed volume
capacity is OS dependent.
1.2.3

System Disks

System disks are disks which have part of their area assigned for use by the system (the system
area), and two system disks are installed in Slot0 and Slot1 in the controller enclosure.
IMPORTANT
1.2.4

Hot Spare

Hot spares are used as spare disks for when disks in a RAID group fail, or are in error status.
The following two types of hot spare are available:
Global Hot spare
This is available for any RAID group.
Dedicated Hot spare
This is only available to one specified RAID group.
For details about Global Hot spare and Dedicated Hot spare, refer to the "ETERNUS DX60/DX80
Web GUI User Guide".
Refer
Make sure to register sufficient hot spares. If a free hot spare is available, when one of the RAID
group disks has a problem, data from this disk is automatically replicated into the hot spare.
P3AM-3042-03ENZ0
ETERNUS DX60/DX80 Disk storage system User Guide
shows the time for volume formatting (when the volume capacity is 100GB).
Volume formatting time (for SAS disks and Nearline SAS disks)
No. of disks
2
Approx. 35 minutes/100GB
8
Approx. 25 minutes/100GB
5
Approx. 25 minutes/100GB
6
Approx. 25 minutes/100GB
6
Approx. 30 minutes/100GB
The value shows the time required for volume formatting when the volume capacity is 100GB and
there is no server I/O. The time depends on the disk configuration or the disk type.
System disks cannot be registered as hot spares.
Assign "Dedicated Hot spares" to RAID groups that contain important data,
in order to preferentially improve their access to hot spares.
"ETERNUS DX60/DX80 Web GUI User Guide"
Time required for volume formatting (*1)
SAS disks
30
Nearline SAS disks
Approx. 85 minutes/100GB
Approx. 55 minutes/100GB
Approx. 55 minutes/100GB
Approx. 55 minutes/100GB
Approx. 75 minutes/100GB
Copyright 2009 FUJITSU LIMITED

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