Disks and Units
56
Snap Server Administrator Guide
Adding Disk Drives to a RAID
This section describes how to safely add drives to an existing RAID 1, 5, 6, or 10. On
Snap Servers, after a fresh drive is inserted into a drive bay, you must use the
Administration Tool to add it to a RAID.
How RAIDs React to Disk Drive Additions
• RAID 0
(nonredundant)
—
You cannot add a drive to a RAID 0. To reconfigure a
RAID 0, you must delete the RAID and then recreate it.
• RAID 1
(redundant)
—
You can add a new drive to a RAID 1 as either a hot spare
or as a new member. Adding a disk drive to a RAID 1 does not add storage
capacity. The new member simply creates an additional copy of the original
drive.
• RAID 5, RAID 6, RAID 10
(redundant)
—
You can add a hot spare to a RAID 5;
RAID 6, or RAID 10. However, you cannot add a new drive as a new member.
Hot Swapping Disk Drives
The term
hot swap
refers to the ability to remove and add components to a system
without the need to turn off the server or interrupt client access to files.
When to Hot Swap Disk Drives
When available storage space is not at a premium, most administrators prefer to
configure a RAID with a hot spare that automatically takes the place of a failed
drive. This solution assures that client access to file systems is not interrupted. In
environments where configuring a hot spare is not possible, you may need to hot
swap a drive.
Hot Swapping Disk Drives
You can hot swap disk drives on Snap Server RAID 1, 5, 6, or 10 by following the
two basic steps outlined next:
1
Remove the failed drive from its bay, and insert the new drive.
The procedures for the physical removal and replacement of a disk drive for Snap
Server
s
are explained in the following sections.
Note
If you have enabled the
automatic incorporation of an unused disk
feature, the
drive you insert (a raw drive, a drive with a non-GuardianOS partition, or an
unassigned GuardianOS-partitioned drive) will be automatically incorporated
into the RAID. Skip Step 2.
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