User Guide

changes that were made after the disk was removed need to be synchronized, greatly speeding up the
process.
A disk can become temporarily disconnected in the following situations.
• A disk is accidentally removed from the NAS while the NAS is powered on.
• The NAS unexpectedly shuts down because of a hardware or software error.
• A user presses the power button for 10 seconds or disconnects the power cable while the NAS is
powered on.
Important
• You can only create bitmaps for RAID 1, RAID 5, RAID 6, and RAID 10 groups.
• Enabling a RAID bitmap causes the RAID groups performance to decrease slightly.
• A bitmap improves resynchronization time only if the same disk is added back to the
RAID group. If a new disk is added to a RAID group, the bitmap makes no difference.
1. Go to Main Menu > Storage & Snapshots > Storage/Snapshot .
2. Select a storage pool or single static volume.
3. Click Manage.
4. Select a RAID 1, RAID 5, RAID 6, or RAID 10 group.
5. Click Manage and then select Enable Bitmap.
A confirmation message appears.
QTS creates a bitmap for the RAID group.
Recovering a RAID Group
RAID recovery enables you to recover a RAID group in the event of accidental disk removal or SATA
connector failure. When several disks are removed or disconnected from a RAID group:
• The status of the group changes to Error.
• The statuses of all volumes and storage pools using the RAID group change to Inactive.
• All data on the affected volumes and LUNs becomes inaccessible.
Important
RAID recovery only helps when disks are temporarily disconnected and then reconnected.
It does not help in the event of disk failure.
1. Reconnect all disconnected disks.
Important
Ensure that each disk is reinserted into its original drive bay.
2. Go to Main Menu > Storage & Snapshots > Storage/Snapshot .
3. Select a storage pool or single static volume with the status Inactive.
4. Click Manage.
QTS 4.3.4 Getting Started Guide
Storage & Snapshots 44