Reference Guide

On the Scality web site, in the left pane, select Customer Support FAQ. In the right pane, select Logs and
Errors > A disk failed! What do I do? A procedure named Changethediskassoonasafailureisdetected is
located here.
Useful information about disk failure is listed in the Customer FAQ > Uncategorized > Why is our whole
platform slowing down after a single disk failure.
4.2 Backing up and restoring configuration files
The Scality documentation web site offers information on backing up and restoring a Physical Server,
Connector, and Supervisor configuration files.
On the Scality web site, in the left pane, select Install and configure > Configuration > Backup
configuration files.
The scality-node, scality-rest-connector, and scality-supervisor packages each install a script and a daily
cron job, which performs the backup of important configuration files. The backup files are stored under
the following directories:
/var/lib/scality-node/backup
/var/lib/scality-rest-connector/backup
/var/lib/scality-supervisor/backup
Use backup files to reinstall the packages in case the contents of the /etc directory are lost or damaged.
If the backup files are copied to another server, use them to install the packages from scratch.
4.3 Adding Scality RING capacity
Expanding capacity to the Scality RING should occur when your Scality RING installation has reached 60
to 65 percent total capacity. This ensures that the expansion starts prior to the RING reaching 80 to 85
percent total capacity.
Monitor capacity usage and plan to grow the RING when it has reached 80 percent capacity. Scality
recommends not allowing the storage pool to fill up above 90 percent before expansion.
Warning: Although the system continues to run after the storage pool fills above 90 percent, writing new
data becomes an issue as the system approaches full capacity.
Consult your certified Scality sales team for detailed capacity planning.
4.3.1 To add a new disk to expand storage
Expand storage by adding disks to empty slots in a Dell SD7000-S. Disks should be added evenly to all
Physical Servers, so that capacity is evenly distributed around the Scality RING. While adding drives, ensure
to maintain a raw HDD to SSD capacity ratio greater than 0.6 percent.
8 Dell Storage Designed for Scality RING Best Practices Guide | A00.