Reference Guide

4 Maintaining the Scality RING
To locate useful scripts for maintaining the Scality RING, go to http://docs.scality.com. In the left pane, go
to Operations > Scripts. Find each script mentioned in this section listed under Scripts on the Scality
documentation page.
4.1 Detecting disk errors and replacing disks
You can use the following disk management scripts (tools) to add new disks in empty slots (whether to
increase data storage capacity or to serve as a non-volatile path (NVP) containers for object metadata) or
to replace disks when the repair helper returns a REPAIR_FAILED exit code.
In the left pane, browse to Operations > Tools, and then in the right pane click Disk Management Tools.
This path includes links and instructions for adding and replacing failed disk.
In the left pane, find more disk management procedures under Operations > How to > Disk How To. This
page includes the following sections:
• How and when to change a failed disk
• Check disk usage
• Check system logs for disk errors
• Restore bizobj.bin on a faulty SSD
4.1.1 To replace a disk
Use the tool scaldiskreplace to replace a failed disk. Download the script from the Scality
documentation web site.
On the Scality web site, in the left pane, select Operations > Monitoring > Disk Management Interface.
Note: Although you can use scaldiskreplace to replace a healthy disk with a disk that provides
increased storage capacity or superior performance, this is not encouraged. Disk deactivation is not
automatic for replacement of a healthy disk. The scaldiskreplace tool does not copy anything. When
replacing a healthy disk, copy the disk data manually. Manual intervention by an operator is required to
deactivate the disk (stop the biziod), delete the configured nvp directory (if any), and unmount (umount)
and remove the disk being replaced.
4.1.2 To replace an SSD
Plan to replace SSD before it fails. Use this task to be proactive with SSD replacement.
On the Scality web site, in the left pane, browse to Operations > How to > Node and biziod How to and
click Planned replacement of an SSD.
4.1.3 To change a disk as soon as failure is detected
The Scality web site contains information and tips about changing a disk as soon as a failure is detected.
7 Dell Storage Designed for Scality RING Best Practices Guide | A00.