Netgear RD5D (ReadyDATA Disk Packs) – ReadyDATA Disk Packs (SATA/NL-SAS/SAS/SSD) User Guide
ReadyDATA Performance Considerations
Did I Purchase the Right Disk Type?
ReadyDATA supports several disk types to meet the performance requirements
of various storage applications. The hard disk drives (HDDs) that NETGEAR
offers with ReadyDATA systems differ in capacity, performance, and price. To
determine the type and number of HDDs for a ReadyDATA system, first
consider the level of performance that you require, then determine the RAID
configuration that you intend to use, and finally consider the usable capacity of
the ReadyDATA system.
of various storage applications. The hard disk drives (HDDs) that NETGEAR
offers with ReadyDATA systems differ in capacity, performance, and price. To
determine the type and number of HDDs for a ReadyDATA system, first
consider the level of performance that you require, then determine the RAID
configuration that you intend to use, and finally consider the usable capacity of
the ReadyDATA system.
Many network environments require high performance volumes, while for other
environments, capacity is equally important. The combination of the selected
RAID type and HDDs determines the performance and capacity of a volume.
environments, capacity is equally important. The combination of the selected
RAID type and HDDs determines the performance and capacity of a volume.
HDD
Description Storage
Capacity
Performance Conclusion
SATA Serial ATA
drive
7,200 rpm
7,200 rpm
1 TB, 2 TB,
3 TB, and 4 TB
3 TB, and 4 TB
Low
SATA disks offer large storage
capacity, but compared to
SAS and SSD disks, the
lowest performance.
capacity, but compared to
SAS and SSD disks, the
lowest performance.
SAS
Serial
attached
SCSI drive
15,000 rpm
attached
SCSI drive
15,000 rpm
300 GB,
450 GB, and
600 GB
450 GB, and
600 GB
High
SAS disks deliver a better
performance than SATA disks
but offer more limited storage
capacity.
performance than SATA disks
but offer more limited storage
capacity.
SATA
SSD
SSD
Serial ATA
solid-state
drive
solid-state
drive
50 GB, 100 GB,
and 200 GB
and 200 GB
Highest
SSD disks outperform SATA
and SAS spindle disks but are
more expensive and offer
limited storage capacity. You
can use SSD disks as boost
disks in a hybrid volume.
and SAS spindle disks but are
more expensive and offer
limited storage capacity. You
can use SSD disks as boost
disks in a hybrid volume.
The following figure shows the performance, measured in Input/Output
Operations Per Second (IOPS), for random reads and writes using a 4k block
size on SAS and SATA disks. For performance-sensitive applications, such as
virtualization and iSCSI volumes, NETGEAR recommends SAS drives.
Operations Per Second (IOPS), for random reads and writes using a 4k block
size on SAS and SATA disks. For performance-sensitive applications, such as
virtualization and iSCSI volumes, NETGEAR recommends SAS drives.
I am concerned that I might have purchased the wrong disk type. What can
I do?
I do?
Contact your reseller to discuss your storage performance requirements and
ask them to involve a NETGEAR sales engineer or representative in the
conversation. You might be able to exchange your disks for a type that better
suits your needs.
ask them to involve a NETGEAR sales engineer or representative in the
conversation. You might be able to exchange your disks for a type that better
suits your needs.
How Should I Configure My Volume?
The selection of the RAID type and the types of HDDs determine the
performance of a volume.
performance of a volume.
The following table compares RAID types and performance when all volumes
have the same types of HDDs (except for the hybrid volume, which also
includes SSD boost disks).
have the same types of HDDs (except for the hybrid volume, which also
includes SSD boost disks).
The following figure shows a performance comparison of RAID levels. A RAID 10
volume provide the highest overall performance, while RAID 5 and RAID 6
volumes provide the lowest performance.
volume provide the highest overall performance, while RAID 5 and RAID 6
volumes provide the lowest performance.
For information about NETGEAR’s recommendations for RAID levels for specific
storage applications, see
storage applications, see
.
RAID Type
Performance
RAID 10
•
Highest throughput performance and highest number of IOPS
compared to the other RAID types.
compared to the other RAID types.
•
Requires one mirror disk for each storage disk.
Hybrid
RAID 5+0 with
3 boost disks
RAID 5+0 with
3 boost disks
•
The expansion allows for highly increased performance compared
to RAID 5 without boost disks.
to RAID 5 without boost disks.
•
Requires one parity disk for each expansion.
•
Requires a minimum of two drive bays for boost disks.
RAID 5+0
•
The expansion allows for increased performance compared to
RAID 5 without expansion.
RAID 5 without expansion.
•
Requires one parity disk for each expansion.
RAID 6+0
•
The expansion allows for increased performance compared to
RAID 6 without expansion.
RAID 6 without expansion.
•
Requires two parity disks for each expansion.
RAID 5
•
Low performance compared to the other RAID types.
RAID 6
•
Lowest performance compared to the other RAID types.