Configuring storage profiles, Automatically progressing data to essds, Disabling write cache – Dell Compellent Series 40 User Manual
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Storage Center 5.5 System Manager User Guide
Enterprise Solid State Drives
Configuring Storage Profiles
Because ESSDs are automatically assigned to Storage Tier 1 after installation (see
Tiers and Storage Profiles on page 403
), the system-provided profiles that include Storage
Tier 1 allow volumes to use ESSD storage:
•
On Storage Centers without licensed Data Progression, the system-provided High
profile includes ESSDs. Make sure only volumes you want to use ESSDs are assigned
to the High profile; reassign all other volumes to either the Medium or Low profiles.
•
On Storage Centers with licensed Data Progression, the system-provided
Recommended profile includes ESSDs. Make sure only volumes you want to use
ESSDs are assigned the Recommended profile. Create and apply a new profile that
does not include Storage Tier 1 for all other volumes.
For information on creating Storage Profiles, see
Creating Custom Storage Profiles on
; for information on applying profiles to existing volumes, see
Automatically Progressing Data to ESSDs
After you have finished re-configuring the Storage Center Storage Profiles and installed
ESSDs, the Storage Center automatically progresses data from the disks in the old Storage
Tier 1 to the ESSDs in the new Storage Tier 1. The automatic Data Progression requires
approximately four days to complete.
Note
Do not adjust Data Progression settings to speed up progressing data to ESSDs. To
accelerate the progression of data to ESSDs, use CMS to copy and swap the
volumes.
Disabling Write Cache
To maximize performance, disable write cache on volumes that use ESSDs.
1 Select the volume, then click Properties. The Volume Properties window appears.
2 Select the Cache tab.
3 Uncheck the box next to Enable Write Cache
4 Click OK.
Replays
Replays are an important requirement for efficient Data Progression. For the most efficient
use of ESSD, Replays should be taken at least once per day. For more information on
Storage Center Replays, see