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Questions tagged [controller]

98 questions
14
votes
7 answers

What is a (raid-controller-) BBU for?

I am wondering what's the purpose of a BBU. My first understanding was, that it enables the cache to write the data to the disc during a power failure. But some specifications say that a BBU can hold its data for up to 72h. I'd expect the data to be…
tanascius
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12
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1 answer

ssd firmware, linux: updating large batch of drives

I was recently hit with a fatal firmware bug that affected dozens of Crucial SSDs deployed in my datacenter. Many of the affected machines use LSI or other proprietary SAS controllers, which Crucial's bootable ISO does not recognize. None of the…
wryfi
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6
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2 answers

Verifying if a DC is a RODC

I'm in a situation where I'm trying to help out a friend who has little knowledge of his system. He is trying to install a program onto his domain controller and it gives an error stating that it cannot be installed on a RODC. This is the only DC…
JArrington1
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5
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4 answers

Setting up a Secondary DHCP Server, for failover

Possible Duplicate: Can I have multiple DHCP servers on one network? Current Environment: Windows Server 2003 (Primary Domain Controller) Primary DHCP Active Directory Print Server Exchange 2003 Windows Server 2008 (Secondary Domain…
Anicho
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5
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1 answer

Smart Array P400 battery failure

The P400 Smart Array controller in my HP DL380G5 is indicating: Battery Status: Failed, Replace Battery 1 in the System Management Homepage. Also the IML indicates: POST Error: 1794-Drive Array - Array Accelerator Battery Charge Low I do have…
RobIII
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5
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2 answers

Nearline SAS on SATA controllers

I know that SAS drives cannot operate on a SATA controller. I know that SATA drives can operate on a SAS controller. But can Near-Line SAS drives, being SATA drives with a SAS controller, be used on A) only SAS controllers B) both SATA and SAS…
Vincent Vancalbergh
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4
votes
1 answer

Recovery from i8042 no controller found during boot?

I have a set of identical hardware, Dell R210s. To replicate their configuration, I use a method to image /dev/sda from a working machine, and then apply that image to a new machine. It has been accomplished many times without a hitch. As root on…
dacracot
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4
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3 answers

Difference between FBWC capacities?

When buying a FBWC storage controller such as HP's P420, you can choose either a 512MB, 1G, or 2G capacity. What differences do these capacity sizes provide? Is there a metric I can use to choose between them? Is it related to an 'all-the-time'…
Nicholas
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4
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2 answers

How does a SAN architecture work and more importantly scale?

I'm trying to understand some SAN infrastructure and I was hoping some of you with more experience than me could help me understand scaling with a SAN. Imagine that you have some computer servers that have a HBA. They connect either directly or via…
Spence
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0 answers

Which USB controller is device plugged into on ESXi host

I need to pass through a USB controller (not just the USB device) to a guest on an ESXi 6.7 host. Is there a way (without trial and error) to determine which controller a device is plugged into? So if I wanted to pass through the controller which…
TSG
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3
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1 answer

Monitor the Garbage Collector of an SSD

The SSD controller triggers the garbage collection routines on a specific ship or block when a certain threshold of either invalid pages or written pages is met, based on the GC policy (my guess is that most SSDs use the greedy policy). I am trying…
SamTh3D3v
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3
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1 answer

Windows Server 2012r2 virtualized domain controller

My work environment contain a single forest with two domains DomainA and DomainB. DomainA contain the following: DC01 holds all FSMO roles for the domain and forest, Global catalog and is forest root DC02 is Global catalog DomainB DC03 is…
Shad
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3
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1 answer

Configuring Cisco AIR-CAP-2602i as the only WLAN AP on the network

I apologise in advance I'm about half way through CCNA so I may be using incorrect terminology. I've been tasked with putting in a new network at work, topology as follows: Router Cisco 887VA-M-K9 | Switch Cisco SLM2024T | WLAN AP Cisco…
Nobo
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3
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2 answers

HP SmartArray 410i controller slow?

Have just had a new HP DL380 G6 server set up. This has a SmartArray P410i controller and seven 2.5" 146Gb SAS 10k RPM disks, configured as three RAID1 arrays and a floating hot spare. Problem: I did a disk performance test on the drives using…
Quango
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3
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1 answer

HP DL380 G7 RAID controller detecting bays incorrectly - port or mobo?

I've been passed a DL380 G7 which appears to work fine (all usual checks come back OK, Linux boots OK, LV creation is OK and disk access is OK) -- except the left hand four bays connected to port 1 of the controller don't report correct IDs. There's…
Chris Woods
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