Describe the features and performance characteristics of serverclass hard disks and solid state drives Describe features of the SCSI interface and know how to configure devices correctly Describe features of the SATA and SAS interfaces and know how to configure devices correctly ID: 675486
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1.2 Storage Devices
CompTIA Server+ Certification (Exam SK0-004)Slide2
Describe the features and performance characteristics of server-class hard disks and solid state drives
Describe features of the SCSI interface and know how to configure devices correctly
Describe features of the SATA and SAS interfaces and know how to configure devices correctly
1.2 Storage Devices
15Slide3
Persistent storage – can preserve data without power source
Application installation and data files
Shared disk resourceInterfaces - SCSI / SAS /
SATADrive form factors3.5”
2.5”
5.25”Height – half height or low profile
Mass Storage Devices
1.2 Storage Devices
15Slide4
Hard Disk Drive (HDD)
Platters, tracks, sectors, and cylinders
Advanced Format / 4K
Revolutions per Minute (rpm)15,00010,000
7200 / 5400
Access time (milliseconds / ms)Seek time
Rotational latencyInternal transfer rateExternal transfer rate
Capacity (Gigabytes / GB) or Terabytes (TB)1.2 Storage Devices
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Enclosure /
Backplane
1.2 Storage Devices
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Small Computer System Interface (SCSI) Parallel SCSI
SCSI-1
SCSI-2Fast / wide SCSIActive termination
SCSI-3UltraSCSIFirewireFiber Channel / iSCSI
SAS
SCSI
1.2 Storage Devices
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Parallel SCSI Configuration
HBA (Host Bus Adapter)
Signaling
Low Voltage Differential (LVD)Single Ended (SE)
High Voltage Differential (HVD)
TerminationIDs and LUN (Logical Unit Number)Drivers / config utility
1.2 Storage Devices
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IDC50 - a 50-pin internal connector used with early SCSI devices (SCSI-1)
CN50 - a 50-pin Centronics-style connector used for external connections in early SCSI devices
HD68
- 68-pin connectors used for internal and external ports. 68-pin adapters support Wide SCSISingle Connector Attachment (SCA) - an 80-pin connector that incorporates both a power connector and configuration wires, allowing for hot swappable drives
Parallel SCSI Connectors
1.2 Storage Devices
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SAS
Serial Attached
SCSI (SAS)
Dominates enterprise server market3, 6, or 12 GbpsBus can host SATA devices
Configuration
Dual port (redundancy)Single- versus multi-lane
1.2 Storage Devices
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SFF 8087 - internal mini connector for both adapter card ("host") and 4 drive or backplane ports ("target
")
SFF 8088 - external mini connector for both adapter card and drive enclosures
SFF 8484 ("Multilane") - legacy 32-pin internal or external HD connector (host) supporting four 7-pin lanes (target). The remaining pins are used for "sideband" signals (LEDs and status monitoring)
SFF 8470 ("
Infiniband") - legacy jackscrew connector for both internal and external use
SFF 8482 - internal connector compatible with both SAS and SATA drives. This type of connector would be used principally to attach SATA devices (such as DVD drives) to an SAS bus
SAS Connectors
1.2 Storage Devices
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SATA
Serial
ATA (SATA)Desktop market / cheaper servers
1.5 / 3 / 6 GbpseSATASATA and SAS
1.2 Storage Devices
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Solid State Drive (SSD)
Drive using flash memory for solid state storage
Single Level Cell (SLC
Multi-Level Cell (MLC) / Enterprise MLC (eMLC)
SSD interfaces
SATAPCIe (PCI Express)
SATAe (SATA Express)Advanced Host Controller Interface (AHCI) versus
Non-Volatile Memory Host Controller Interface Specification (NVMHCI) / NVM Express (NVMe)
1.2 Storage Devices
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HP SSD with SATA interface
(Image © 2014 Hewlett-Packard
Development Company)Slide13
Use profileReads versus writes
Sequential versus random I/O
Input / Output Operations per Second (IOPS)
Wear leveling
SSD Performance
1.2 Storage Devices
25Slide14
Describe the features and performance characteristics of server-class hard disks and solid state drives
Describe features of the SCSI interface and know how to configure devices correctly
Describe features of the SATA and SAS interfaces and know how to configure devices correctly
1.2 Storage Devices
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