RAID stands for Redundant Array of Independent Disks.

RAID is data storage technology that allows multiple drives to be used together as a single virtual drive for reasons such as fault tolerance, reliability and performance.

There are several different levels of RAID that determine how the data is stored and the level of redundancy achieved across the drives.

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Hello, All.

Before I go any further with the RAID 5 configuration that I currently have set up.

What is the best array to run for a web server running?
IIS, SQL Server, Mail Server, etc...

I currently have 4 - 500GB drives in the ARRAY.

My RAID card gives me these options.

RAID 10,
RAID 50,

I have another server that will be brought into the network by the end of summer, and another server by Christmas.
So, whatever information I get here from this thread, will most likely be used across all servers.

Suggestions are greatly appreciated.
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Increase Security & Decrease Risk with NSPM Tools

Analyst firm, Enterprise Management Associates (EMA) reveals significant benefits to enterprises when using Network Security Policy Management (NSPM) solutions, while organizations without, experienced issues including non standard security policies and failed cloud migrations

I am still somewhat new to Virtualization and I am currently in the process of upgrading/expanding my VM server farm. I was going through some documents and in of the documents it mentions that I should have a separate disk array for each virtual machine on a multiple virtual machine system.

My question is what do they mean? I have a 6 disk server and would like it to host 3 VM's. From how I read the statement above I should configure server into 3 RAID 1 configurations where normally I would configure either a RAID 5 or 10 then split the array into however many disks I need for the 3 VM's.

What is the correct way? Right now I have all of my VM servers configured as RAID 5 the chop up the array into drives for the VM machines
Hello, All.

OK, I have the following.
VMWare 6.5 Update 1 (Free version)

Adaptec RAID 6805T

I have it configured for a 4 drive RAID 5.
However, it is not showing up inside of ESXi.

I found this driver.
Adaptec RAID Driver v1.2.1-52040 for VMware

However, the driver is for versions of VMware 5, 5.5, and 6.0
I have 6.5 update 1

Also, if this driver will work with 6.5 u1
How would you install it into the FREE Version of VMWare?

I also found this information as well.
I just want to make sure that this is going to work before I attempt it.
How to install 3rd Party RAID controller drivers in VMware ESXi 6.0

I would like so input on this before I attempt to do this.
As this is on a production system, and I prefer not to mess anything up.

Mac user.
User had an old, no longer supported Promise RAID5 that had a drive stop working.
I inserted a replacement, but after 3 days the RAID didn't rebuild.
I pulled the new drive, but even though I was able to see the folders, no files could be accessed.
I called Promise.
Because the RAID was an older model, Promise had no Promise software was able to run on any Mac to do diagnostics.  They told me to find a backup, attach the drive to a Windows Machine, and only use it with Windows.

This is a disappointment.  I had a backup on BackBlaze, but it takes days to recover 2 TB

I need to choose between:
  • Finding an old Mac that will run the old Promise software, reformatting the Pegasus RAID 5, and assuming that the error was a one-show
  • Buying a new Pegasus 2  Thunderbolt - connected unit
  • Buying a CRU RAID one, and connecting it with a Thunderbolt to Firewire 800 connector, or else USB 3

User has a collection of Videos that they want to keep on a RAID.
They do not add videos very often, and may do some simple editing from time to time.

I realize that the RAID 1 would allow them to pull a drive out for safe keeping, and then rebuild the mirror.
I am wondering if CRU unit with USB 3 connected directly to a 3 year old iMac would have the throughput necessary to play Quicktime MOV files

Hi, I have a Dell server RAID 5 with a PERC S110 controller.  I have two questions, can I get a walk through on replacing the failed drive?  Also do I have to use the same exact Sata drive, or can it be bigger?  The drive now is Dell MG0.ACA110.

Thanks a ton guys.
how do i fix a failed disk

on disk management on windows server 2008 it does not show an error but in server administrator the disk shows failed . see snapshots
hello experts
We have a Dell PowerEdge R510.  RAID battery is showing a "Missing" error.  is this most likely a bad battery?

Thank you,

I'm looking at purchasing a server to run hyper-v, originally i was going to go with 8 x 900Gb 15Kpm SAS drives in raid 10. then my boss mentioned about some more projects, meaning I have now needed to look at more space. I'm now looking at 10 x 1.2Tb 10Kpm SAS drives in raid 10.

due to the 1.2tb 10k being about the same price as a 900gb 15k, I'm stuck in a dilemma over space and speed.

so i looked up a raid calculator

8 x 900Gb RAID 10 will give me 3.6Tb with speed gain 8 x read and 4 x write - but note they run at 15k speed drives

10 x 1.2Tb RAID 10 will give me 6Tb with speed gain 10 x read and 5 x write - but note they run at 10k speed drives

does the rpm of the drive matter when you can see an increase in the bandwidth of the drives ?
Hi ,

we have Fujitsu server, vmware exsi 5.5.0 has installation..
 while booting up its shows the error below:
error loading s .v00 fatal error 8 device error.
I can reinstall exsi 5.5.0 , if i reinstall exsi 5.5.0 from SAN storage my all VMs server will be erased or raid configurations will be changed.

please help me resolved the issues please.

I have a Dell PowerEdge R510 server running Server 2008 R2 Standard.
It has a 5 HD Raid 5 configuration and 2 virtual discs.

VD1 1843.20 GB Windows Disc1
VD2 17.72 GB Windows Disc2

I noticed there were faults in the OMSA whenever I rebooted the server, however the fault was cleared in the next log entry:

Fault detected on Drive 3 in disc drive bay 1.
Drive 3 in disc drive bay 1 is operating normally.

There is no hot spare, so I decided to install a hot spare in the event one of the discs goes bad.
I purchased a drive, inserted it while the server was on. OMSA created a virtual disc named NONE.
I therefore deleted the NONE virtual disc and proceeded to Assign/Unassign Dedicated Hot Spare to Virtual Disc 1.
In OMSA Virtual Disc 1 began to rebuild and subsequently failed.

Unfortunately, from the logs it appears that the virtual disc was no longer redundant so when it tried to rebuild it failed.
I've attached all the logs.

I have a barebone windows backup and backed up the data that we will need.

At this point, I do not want to reboot the server since it is running. I also suspect that I will need to rebuild this server from scratch.
Unfortunately a Windows update caused the Windows Server Backup wbadmin.msc component to stop working.

I would like to get another opinion based on the logs.

Is there a way to recover from this or does this server need to be rebuilt?

Reboot prior to hot spare attempt
Log after reboot - prior to hot spare attemptdescrip stor5 - data redundancy lost - @rebootdescrip stor0212 - device failed - @rebootdescrip pdr211-storage medium error-@reboot and post hot sparedescrip vdr110-unrecoverable storage medium-@rebootdescrip vdr11 - config hot spare - @reboot
Post hot spare addition
Log post hot spare attemptdescrip pdr211-storage medium error-@reboot and post hot spare
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My RAID 0 array consisting of 2 X 2 TB WD Caviar Greens has failed! When I dissembled the drives from the desktop and connected them on a PC running a copy of windows both the drives are being shown in diskmanagement, however I am not able to see these volumes. Please help me out, banging my head around this problem for more than 3 days but it still is resilient. I have even tried recovering it using that linux mdadm method but that too doesn’t show the volumes, Is there any way out?
Looking for advise/recommendations on what to use as additional external storage for a (Veeam) backup repository. I have a W7 PC with 4 x 4Gb SATA drives as RAID 5 (on board controller) which is used exclusivley to receive backup copies from a Veeam server. The PC is in a remote location so is used instead of a plain storage device so it can run the Veeam agent and perform deduplication and caching. I would like to increase the storage by adding an external enclosure as the internal slots are full. The additional storage would require its own RAID controller. Suggestions/advice sought. Thanks.
Exists any problem if I combine 5 WD NAS HDD and 5 Segate NAS HDD the same speed and cache to create a RAID?  or they need to be the same brand?
I have an Adaptec 1405 SAS controller on an ASUS P8Z77-V LK motherboard. The device manager shows the controller needs a driver update.

My problem is I am using Windows 10 and there are no 1405 drivers available for windows 10. There are 1405 drivers available for Windows XP.

How can I update the SAS controller drivers so I can install Windows XP in a new SSD hard drive?

Thanks for your help!
Once of the DELL VMWare hosts running a RAID 10 4-disk array appears a problem drive.  They had not installed DELL System Mgmt VM app or configure the IDRaC interface, so I am only able to look at the VSphere client interface. The info showed within is confusing to me. The majority of disk status lines show "Normal" / green check mark, there are alerts associated with multiple drives, and references to "Parity Check in Progress - Deassert" and "Rebuild Aborted", "In Critical Array - Assert". I have included screen shots below.

In looking at the front of the server, only 1 of the 4 disk trays has a amber light. The other 3 look fine.

I was gong to just hot swap the amber one, but the VShphere messages are giving me pause. Can anyone provide some insight for me?

Sever spec
Disk messages
Hi guys,

One of the harddrive in  server(HP Proliant ML 350 Gen 9- server 2012 R2)has failed.

Server is configured with RAID6 setup with 5 hardrives. I got a replacement harddrive from HP with similar size.

I just want to know how to replace it and rebuild it??
Can I just switch off the server and replace the harddisk and switch on server back again? Or can i swap the harddisk as its running live without turning off as raid 6 - 2 harddisk can fail.
or do I need to do anything else in particular ?

As this is the first time I am swapping a harddisk, any help would be great.
I have Server 2008 on a poweredge 320. The server would hang on the loading screen but I left it on all night and it finally booted. In the event manager Im seeing "the driver detected a controller error on device harddisk2 dr2. I opened open manage and im not showing any errors in the raid. What else can I do? It takes way to long to boot.
I need to replace a battery on a Dell PERC 6/1 RAID Controller.

I am very concerned that while I'm performing the above action, I will lose the RAID 10 configuration and all the data  residing on the drives. This is a single Dell server working in a live business environment.

Am I correct in believing the RAID configuration resides in the BIOS (supported by the mother board  CMOS battery), not the RAID controller itself?

What is the battery's function on the PERC 6/I RAID controller? Is it just to cache data to ensure speedy access?

Can I literally shut down the server, disconnect the hard drives, pull the card, replace the battery, reconnect all, boot the system and return to my original normal environment?

Is there anything I need to watch out for?

 I have two servers with six 600GB SAS hard drives. Two of them are on RAID 1 and four of them are on RAID 10.
 I keep new brand 600GB SAS hard drives in stock and have been replacing failing hard drives in both servers.
 However I am going to retire one of two servers and naturally have six 600GB SAS hard drives available.

 My question is if I can use these left-over used hard drives (say from 2nd server) to replace failing hard drives (say in 1st server) in the future?
 Whenever I replace a failing/failed hard drive with a brand new one, RAID system begins "Rebuilding" process automatically.
 Can I expect the same when I plug in a used hard drive that has been a part of another RAID configuration or should I somehow re-format these used hard drives before the use?

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I have a customer that I just installed a new server for.  The system is setup with RAID 1 and he understands that the drives are mirrored but he wants me to show him that there is actually data on both drives.  Is there anyway to do that?  The server is a Dell T330 with 2 x 2TB 3.5" drives.
I had this question after viewing Can't initialize hard drives in Adaptec array configuration utility..

That's the closest matching issue I've been able to find.

Up/Down arrows do not work in Adaptec RAID BIOS on the "Create Array" page.
They work just fine EVERYWHERE ELSE in the BIOS nav menus and on every other settings page. They just don't work on "Create Array"
Drives are shown, and I can select the first drive with INS and remove it with DEL, but I can't move up or down to choose any other drives for an array.

Hard MoBo BIOS reset back to factory settings.
4 different keyboards.
Reflashed Adaptec BIOS (Latest Build 18948).

It's a Standalone Homemade Desktop repurposed as a server.
MoBo: Asus P5K Deluxe
Q6600 CPU
Adaptec ASR-5405 SATA2 RAID Card

This server WAS WORKING. I powered it off, it sat unused for a while, and now I'm pulling it back out for a new project.

I can't get a new RAID array setup to even begin with an OS setup. Like I said ALL OTHER MENUS and settings work fine. It's only the "Array Configuration Utility" > "Create Array" page.
I have installed an Intel rs2wc080 RAID controller card in a server.

There are two 6 TB SAS drives connected to this controller card.

It takes a long time for the controller card to initialize during the POST.

Then after around 10 minutes, a message appears that says "No Mega RAID adapter installed."

I have pressed CTRL-G  in an attempt to enter the configuration utility for this RAID controller card but I am not able to enter the configuration utility.

What can I do to further troubleshoot and fix this issue?
What URLs can I use to download drivers for an Intel rs2wc080 RAID controller card for Server 2016?

I have already visited the website and have downloaded and installed several drivers.

However, this device appears with yellow exclamation points within Device Manager.

Where can I obtain the proper Server 2016 drivers for this device?

Intel SATA controller conflicts
I have a HP ml310e gen8 v2 server with 2 disk raid.Disk 2 had failed and i decided to replace that drive I shut down the server and replaced the drive. the server would not boot replaced the old drive and the server still wouldn't boot. i ran the acu and it says the raid is ready for rebuilding,  after the server initialises the raid card it says  1778 drive array assuming automatic data recovery process. this is with the the failed drive. it then goes through a disccheck  and moves on to  automatic repair.and I seem to be going around in circles. i am not great in raids so I must have screwed up someplace. is there any way i can get the working drive back running again?
Does everyone else get sick and tired of reading through all the crap when researching for solutions nowadays? I mean... Jeez..  I am looking for a NAS device with 6T capacity. Meaning I want available capacity of 6T in one volume, when all is configured.... RAID etc..  Looking for one where I don't have to deal with any Cloud, or other software nonsense on the unit itself... just a clean...6T of storage hanging off the network or eSATA attached to the router.
I start reading and I get all the OS , server, and cloud and FTP and streaming flap...  
I have not installed a lot of NAS, I guess I am a NooB at this. But I remember a Synology unit from a few years ago I had to fight with to get my capacity as I wanted it.
What I am asking guys is.... I know RAID is probably mandatory, and I understand that benefit and thats not an issue as long as I can build 6T with parity in the RAID so I can rebuild if a drive fails, With MINIMUM nonsense and OSes and This and that getting in the way. I have an imaging software I will use from the 9 workstations to backup to the NAS daily.
Its a NooB question and I truly appreciate any answers or direction to product, ideas, you may have. Thank You.


RAID stands for Redundant Array of Independent Disks.

RAID is data storage technology that allows multiple drives to be used together as a single virtual drive for reasons such as fault tolerance, reliability and performance.

There are several different levels of RAID that determine how the data is stored and the level of redundancy achieved across the drives.