Dell RAID Controllers

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Solutions

PERC 4e/DC
The PERC 4e/DC provides ultimate performance, data protection and scalability for internal and external SCSI RAID applications. It features a high-bandwidth x8 PCI-Express host interface, 128 MB Transportable Battery Backed cache and supports RAID levels 0, 1, 5, 10, 50. Its two U320 SCSI channels can be used for internal connection on PowerEdge servers or for external connection to PowerVault 220/221 Direct Attached Storage.PERC 4/DC
The PERC 4e/DC provides ultimate data protection and scalability for internal and external SCSI RAID applications. It features a 64-bit, 66MHz PCI host interface, 128 MB Transportable Battery Backed cache and supports RAID levels 0, 1, 5, 10, 50. Its two U320 SCSI channels can be used for internal connection on PowerEdge servers or for external connection to PowerVault 220/221 Direct Attached Storage.PERC 4e/Di
PERC 4e/Di provides high performance data protection with better scalability than PERC 4e/Si. It has two 320 MB/s SCSI channels and 256MB of cache. The controller has internal and external connectors and supports RAID levels 0, 1, 5, and 10. This controller is an option for PowerEdge 2800, 2850, 6800 and 6850 servers.PERC 4e/Si
The PERC4e/Si provides high performance data protection. It has one 320 MB/s SCSI channel and 256MB of cache. The controller has an internal connector only and supports RAID levels 0, 1, 5, and 10. This controller is an option for PowerEdge 1850 servers.PERC 4/SC
The PERC 4/SC provides quality data protection, with connection to either internal or external drives. It features one 320 MB/s SCSI channel and a 64-bit, 66-MHz PCI host interface. It also has 64MB of cache and supports RAID levels 0, 1, 5, 10, and 50. It is available on value-focused PowerEdge servers.PERC 320/DC
The PERC 320/DC provides quality data protection for internal drives. It features two 320 MB/s SCSI channels and a 64-bit, 66-MHz PCI host interface. It also has 64MB of cache and supports RAID levels 0, 1, 5, 10, and 50. It is available on select PowerEdge SC servers and Precision workstations.PERC 4/im
The PERC 4/im solution is specially designed to provide RAID 1 functionality for PowerEdge 1855 blade servers. Utilizing SCSI hard drives and its Write-Journaling feature, PERC 4/im provides quality data-protection for two-drive configurations.CERC SATA 6 Channel
This solution provides a great price/performance balance, supporting up to 6 SATA hard drives internally with RAID levels 0, 1, 5, and 10. It is targeted for Precision workstations, PowerEdge SC and value-focused PowerEdge servers.CERC SATA 2S
This solution provides RAID 0 and 1 functionality to SATA hard drives. This solution utilizes the integrated SATA controller on select PowerEdge and PowerEdge SC systems, so there is no need for additional hardware.OS RAID
Operating System (OS) RAID provides RAID 0 and 1 functionality. OS RAID is a software RAID solution and so it utilizes no additional hardware. OS RAID is available with Windows or Linux operating systems and management tools are specific to the chosen operating system.

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Memory

I’m working on specs for some servers that will run MS SQL server. I have discovered some interesting things about memory.

FeatureDetailsFAQGlossary
System RAM, or memory, refers to the amount of data that can be stored on its journey from the hard drives to the processors, and vice versa. With more RAM, the processor will have to retrieve information from the hard drives less often, speeding the overall performance of the system. While some applications, such as email, require more RAM than others, all applications can benefit from increased memory. Dell servers feature DDR2 memory, which enables systems to improve performance and reduce power consumption.

Select the right amount of memory based on your application and number of users
4GB8GB16GB+
File sharing/print50-200 users200-500 users500+ users
Messaging and Collaboration – Email50-200 users200-400 users400+ users
Web Server/Caching200+ users
Infrastructure/Systems Management200+ users
Database50-150 users150-250 users250+ users
Host Multiple Applications50-150 users150-250 users250+ users
ERP, CRM, or other business applications25-100 users100-250 users250+ users
Virtual Environments4-8 virtualized servers>8 virtualized servers

What’s the difference between Memory Mirroring, and Memory RAID?

Memory Mirroring can be thought of as RAID1 for memory – where a pair of DIMMs is copied exactly by another pair of DIMMs. In the event that the first, or active, pair reaches a high error threshold, the secondary, or backup pair is activated. Memory RAID is like RAID5 for memory. It is not on a 1:1 ratio, and requires that all DIMMs be populated. The final pair of DIMMs serves as the backup pair, while all others are active. If any pair exceeds the error threshold, the backup pair activates.

When would I choose Single-Ranked DIMMs, and when Dual-Ranked DIMMs?

This is a matter of price/performance versus scalability. For example, on the PowerEdge 2850, if you selected 8GB of RAM on a system as Dual-Ranked DIMMs, they will address all the memory “ranks” available, thereby maximizing performance for that 8GB of RAM. This while populating only 4 out of 6 slots. However, if the system only had six slots, the 2GB Dual-Ranked DIMMs would consume four of those slots and would disable the two empty slots, essentially maxing out the RAM at 8GB. Meanwhile, 8GB on Single-Ranked DIMMs, which also would consume four slots, would leave the remaining two slots fully usable, allowing you to add more RAM later. However, only two-thirds of the ranks would be addressed, offering less overall performance than the Dual-Ranked 8GB of RAM. So if you think you might need to upgrade your RAM later, Single-Ranked DIMMs are probably the way to go. But if you’re looking for more bang for your buck, and you don’t plan on adding RAM later, Dual-Ranked DIMMs are a great option.