Description
Overview of the Dell UN939 Raid Controller Standard Bracket
The UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller is a hardware device designed to provide enhanced data storage capabilities to servers. This device is specifically compatible with the Poweredge 840 model and comes with a standard bracket. In this article, we will provide a detailed explanation of what this device is, what it does, and how it works. Before delving into the specifics of the UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller, it is important to understand what a Raid Controller is. Raid stands for Redundant Array of Independent Disks. Raid controllers are devices that help manage multiple hard drives by distributing data across multiple disks. This makes data access faster and more reliable than using a single disk.
The UN939 Dell SAS Raid Controller
The UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller is a hardware device that enables Raid functionality on servers. It is specifically designed to work with the Poweredge 840 model of servers. This device connects to the server through a PCI-Express slot and provides enhanced data storage capabilities.
Single Channel
The UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller is a single-channel device. This means that it supports one channel for data transmission between the controller and the hard drives. In other words, it can manage only one set of hard drives at a time.
PCI-Express
The UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller connects to the server through a PCI-Express slot. PCI-Express is a high-speed serial computer expansion bus standard that provides a fast and reliable connection between hardware devices and the motherboard. The PCI-Express slot on the server must be compatible with the device for it to work properly.
SAS
The UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller uses SAS (Serial Attached SCSI) technology. SAS is a point-to-point serial protocol that enables communication between the controller and the hard drives. SAS is faster and more reliable than the traditional SCSI (Small Computer System Interface) technology.
Raid Levels
The UN939 Dell Perc 5/IR Single Channel PCI-EXPRESS SAS Raid Controller supports various Raid levels. A Raid level is a technique for distributing data across multiple disks. The different Raid levels offer different levels of performance, reliability, and data protection. The supported Raid levels for this device are Raid 0, Raid 1, Raid 5, and Raid 10.
- Raid 0 Raid 0 is a technique that uses two or more disks to store data. Data is written to the disks in a way that enables faster data access. This technique does not offer any data protection or redundancy. If one disk fails, all the data on the array is lost.
- Raid 1 Raid 1 is a technique that uses two disks to store data. Data is mirrored across the two disks, which means that the same data is written to both disks simultaneously. This technique offers data redundancy, which means that if one disk fails, the other disk can continue to function as normal.
- Raid 5 Raid 5 is a technique that uses three or more disks to store data. Data is distributed across all the disks in the array, and parity information is also stored. Parity information is used to reconstruct data if one disk fails. This technique offers data protection and redundancy.
- Raid 10 Raid 10 is a technique that uses a combination of Raid 1 and Raid 0. Data is mirrored across two sets of disks, and the sets are striped for faster data access.
General Information about the Dell UN939
- Brand: Dell
- Model Number or SKU# UN939
- Type: Controller
- Product Type: PCI-E
Technical Information
- Device Type : Storage Controller Plug-In Card
- Host Bus : PCIE
- Interface : SAS
- Data Transfer Rate : 300 MBps
- Supported Devices : Hard Drive, Disk Array (Raid)
- Channel Qty : 2
Expansion / Connectivity
- Interfaces : 2 X SAS ( Internal )
- Compatible Slots : 1 X PCI Express
- Compatibility Information : Dell Poweredge 840
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