Dell PowerVault MD3000i Dell PowerVault MD3000/MD3000i Array Tuning Best Pract - Page 30

Appendix D: Glossary of Terms - iscsi raid array

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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices Appendix D: Glossary of Terms Term Burstiness Controller Saturation GiB HBA HDD Interposer iSCSI KiB Kibibyte Long I/O MD3000 MD3000i MDSM MiB NIC NL-SAS Definition A data traffic property defined as the ratio of the peak I/O rate to the average I/O rate; in this case, the mean duty cycle exhibited by I/O transmitted or received from a storage array. Burstiness is adopted from its common usage in describing network workloads. Controller saturation is where an individual RAID Controller Module is reached a maximum operational load and is unable to perform additional operations within its available bandwidth. Additional operations above this maximum point are not lost, they are instead queued up transitionally. This is considered an inflection point where performance hits a hard ceiling. Gibibyte; see kibibyte. Host Bus Adapter Hard Disk Drive Integrated circuit with an interface routing between two opposing signaling sides. Used in the MD3000/MD3000i to interface SATA HDDs to the SAS backplane to perform translation. Internet Small Computer Systems Interface. The iSCSI protocol is defined by the IETF in RFC 3720. See Kibibyte. Kilo binary byte; IEC SI unit to separately denote 1024 or 210 bytes (base-2) distinctly from the base-10 kilobyte (103 or 1000 bytes). See IEC/ISO ISO 80000, IEC 60027-2, or IEEE 1541-2002. Any I/O burst that exceeds 1/3 of the available cache memory size with an increased chance of not being wholly handled in cache. Dell™ PowerVault MD3000 Expandable Storage Array with SAS front-end. Dell™ PowerVault MD3000i Expandable Storage Array with iSCSI front-end. Dell™ Modular Disk Storage Manager. Host management utility suite for configuring and maintaining a MD3000/MD3000i storage array. Mebibyte, see kibibyte. Network Interface Controller Near-line SAS; A hybrid technology of larger capacity SATA HDDs with a special SAS controller board December 2008 - Revision A01 Page 30

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Dell™ PowerVault MD3000 and MD3000i Array Tuning Best Practices
December 2008 – Revision A01
Page 30
Appendix D: Glossary of Terms
Term
Definition
Burstiness
A data traffic property defined as the ratio of the peak
I/O rate to the average I/O rate; in this case, the mean
duty cycle exhibited by I/O transmitted or received from
a storage array.
Burstiness is adopted from its
common usage in describing network workloads.
Controller Saturation
Controller saturation is where an individual RAID
Controller Module is reached a maximum operational
load and is unable to perform additional operations
within its available bandwidth. Additional operations
above this maximum point are not lost, they are instead
queued up transitionally. This is considered an
inflection point where performance hits a hard ceiling.
GiB
Gibibyte; see kibibyte.
HBA
Host Bus Adapter
HDD
Hard Disk Drive
Interposer
Integrated circuit with an interface routing between two
opposing signaling sides.
Used in the
MD3000/MD3000i to interface SATA HDDs to the SAS
backplane to perform translation.
iSCSI
Internet Small Computer Systems Interface. The iSCSI
protocol is defined by the IETF in RFC 3720.
KiB
See Kibibyte.
Kibibyte
Kilo binary byte; IEC SI unit to separately denote 1024
or 2
10
bytes (base-2) distinctly from the base-10
kilobyte (10
3
or 1000 bytes).
See IEC/ISO ISO 80000,
IEC 60027-2, or IEEE 1541-2002.
Long I/O
Any I/O burst that exceeds 1/3 of the available cache
memory size with an increased chance of not being
wholly handled in cache.
MD3000
Dell™ PowerVault MD3000 Expandable Storage Array
with SAS front-end.
MD3000i
Dell™ PowerVault MD3000i Expandable Storage Array
with iSCSI front-end.
MDSM
Dell™ Modular Disk Storage Manager. Host
management utility suite for configuring and
maintaining a MD3000/MD3000i storage array.
MiB
Mebibyte, see kibibyte.
NIC
Network Interface Controller
NL-SAS
Near-line SAS; A hybrid technology of larger capacity
SATA HDDs with a special SAS controller board