Netgear RD521210 – ReadyDATA 5200 12TB SATA Bundle includes RD5200 with 2 x RD5D6LT01 Disk Packs Quick Setup Guide
Optimize Performance on a ReadyDATA System
10
Volume Performance and Configuration on ReadyDATA Platforms
In a virtualized server environment, the types of hard disk drives and RAID type that you
select determine the performance of a volume.
select determine the performance of a volume.
The following table describes the RAID nomenclature and disk requirements; n indicates the
sequential expansion number, and x indicates times (for example, 2x is two times).
sequential expansion number, and x indicates times (for example, 2x is two times).
Table 3. RAID nomenclature and requirements on a ReadyDATA platform
RAID Type
New RAID
Expanded RAID
Number of Required Disks
Number of Disks Dedicated to
Redundancy
Redundancy
RAID 0
RAID 0+
RAID 0+
One or more
Redundancy is not supported
RAID 1
RAID 1+
RAID 1+0, nx
Two only (more disks are not
supported in RAID 1)
supported in RAID 1)
Half (n/2) of the disks in a RAID
group
group
RAID 5
RAID 5+
RAID 5+0, nx
Three or more
One disk in a RAID group
RAID 6
RAID 6+
RAID 6+0, nx
Four or more
Two disks in a RAID group
RAID 10
RAID 1+0
RAID 1+0
Four or more, but an even
number
number
Half (n/2) of the disks in a RAID
group
group
28.
Boost Disks and Advanced Features
This section describes the advantages of SSD boost disks in a hybrid volume configuration
and the disadvantages of compression and deduplication on LUNs.
and the disadvantages of compression and deduplication on LUNs.
SSD Boost Disks
You can install SSD boost disks in a volume that consist of SATA or SAS storage disks. Such
a volume is referred to as a hybrid volume. The SSD disks are not used for storage but
exclusively to boost the performance of the volume.
a volume is referred to as a hybrid volume. The SSD disks are not used for storage but
exclusively to boost the performance of the volume.
SSD boost disks cache data based on two algorithms: most recently used (MRU) and most
frequently used (MFU). SSD caching provides a performance improvement because, for
most storage applications, some data are accessed more frequently than others, and caching
ensures that frequently accessed data is served from the fastest disk (that is, from an SSD
disk).
frequently used (MFU). SSD caching provides a performance improvement because, for
most storage applications, some data are accessed more frequently than others, and caching
ensures that frequently accessed data is served from the fastest disk (that is, from an SSD
disk).
•
SSD read boost disk. A read boost disk increases general read response time and
performance. Generally, a single read boost disk is sufficient to increase the performance
of a volume, but some data sets require additional read boost disks. A read boost disk is
also referred to as a cache disk.
performance. Generally, a single read boost disk is sufficient to increase the performance
of a volume, but some data sets require additional read boost disks. A read boost disk is
also referred to as a cache disk.
•
SSD write boost disk. A write boost disk increases the performance of a volume for
synchronous write operations to the volume. For most configurations, NETGEAR
recommends one boost disk. A write boost disk is also referred to as a log disk.
synchronous write operations to the volume. For most configurations, NETGEAR
recommends one boost disk. A write boost disk is also referred to as a log disk.