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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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I am running a Dell PowerEdge T310.  I have 2(qty) RAID 1 setups.  The Hard Drives are Hot Swap.  The first RAID runs the O/S and the second my data.  One of the drives in the first RAID has a blinking amber light and states there is a predictive failure.  I can see this through the Dell Server Admin login on the Server O/S.  I am purchasing a new drive that is the same model, size and speed. My question is do I simply just pull the Hard Drive with the Predictive Failure out and insert the new one or should I run the Dell Server Admin and set the Predictive Failure drive to offline and then replace?  What would be the safest/proper way to replace this drive?
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Hi there,

I´m struggling with an issue on my exchange server 2007 regarding a database that is in a dirty state. the problem is that this DB file is on a server with a RAID 0 and one of the disks is failing. I´ve managed to force the disk to "malfunction" in order to be able to get the file from it. If I manage to get a copy of the file (db.edb) (the log files are in another drive) will it be possible after rebuilding the RAID with another disk and restoring the volume name and file to access the exchange console and do an ESEUTIL to try to repair the excahnge DB? how can I recover my mailboxes? this is URGENT as we only work with emails and as I write this everything is stopped

I am trying to diagnose an occasional paging file error I am receiving on an HP Proliant ML150 Gen 9 server running Windows 2012 Server R2 Standard.  The warning message is:

warning:  eventid 51
An error was detected on device \Device\Harddisk3\DR291 during a paging operation.

I am trying to figure out which physical or logical device this is pointing to on the server.   Note that the number following DR changes every time there is an entry for this paging error in the system logs.

 I took over administering this server earlier this year.  The server uses an embedded B140i RAID controller for the physical drive connections. The physical disks are set up as follows:

4 X 1 TB SATA drives in RAID-5 array, total available storage c. 2.7 TB
array is split into 2 logical drives:  

  drive C: at c. 400 GB
  remainder is drive N: at c. 2.3 TB

There is also an external Seagate USB 5 TB drive, total available storage c. 4. 7 TB, split into 2 logical drives:

  drive X: at 2.3 TB
  remainder is drive Y: at c. 2.4 TB

I'm attaching a PDF with screen shots of the DISKPART  screen showing disks and volumes as the server sees them, Computer Management / Disk Management screen, My Computer / Drives screen, a Device Manager disk drives summary, and also a tech doc at the beginning of the PDF that provides some decent info on this message but doesn't quite solve it for me.  As per the recommendation of the tech doc I also ran a WMOBJ listing of the …
I have 5 Kingston KC300 240 GB SSDs.  I have a LSI Megaraid 9285CV-8e RAID card version 5.5.  My motherboard is ASRock E3C204-4L with latest available BIOS.  

The SSDs are not detected by the RAID card.  I also tried a Seagate 1 TB HDD and also did not detect it.   I loaded the UEFI defaults in the BIOS but they are still not detected.  On bootup the POST screen says 0 logical drives detected and after logging into the server and launching ServerView RAID Manager, it sees the card but no drives.  All 5 drives are connected to the ports using SFF8087 cables.

Any suggestions?
Hi I have some servers that are using software raid on Server 2012 R2.  I was looking for a software program to email me if one of the drives goes south.

Thanks all.
Please provide me with guides on where to download and how to configure HP ProLiant DL360 Generation 10 servers so I can view and configure their RAID settings within Server 2016.
Dell PowerEdge T620 Failed Disk. The server boots up to a foreign configuration. Asking to select "C" or "F". The system will boot up after selecting F to import foreign config. Server 2012r2 boots up then blue screens critical process died. The system config shows that the virtual disk is offline and 1 disk is ready and 1 is foreign. I am attaching pics of the config page. I have a new drive to install for the one that has the amber light  flashing on it. Any help on getting the RAID fixed and server started would be awesome. IMG_3141.JPGIMG_3142.JPGIMG_3143.JPGIMG_3144.JPG
I have a server 2012 with a Raid 1 hosting a virtual machine. Total allocated disk is 460 gb and the virtual machine disk space was filled up somehow very fast. Hyper.v machine wont boot as a result. Can I pop another hard drive in that server to reallocate a larger raid disk size to increase the space? If I put a 2tb in there can I somehow fix this?
I have a new LSI 9381-8i with 8-7200rpm  NAS drives running on windows 10 and my throughput is ~ 30 MB/s. If I copy to a single SATA drive on the same system, I get about 110 MB/sec.

Writing to 8 drives in raid 5 should be a lot faster even with parity calculations. Why is my raid set so slow compared to a single drive? Does LSI require some kind of configuration setting I'm unaware of? At that speed my system can't cope with the video feeds I'm sending to it.

Thank you for any help.

Lots of comments I have read on EE and Googleiiinggg about Hardware SSD Raid 1 is a massive performance hit because the TRIM feature is lost.

As a means to keep redundancy, software RAID in Server 2016 is seen as a serious option. Still supports TRIM for the fast performance.

Please can I have some comments as I am about to commit to this in a 2x SSD and 2x SAS drive config in a server.


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I have a Dell 5810 workstation with Win 10. Drive c: = 1tb ssd. Drive d: = 1tb ssd. I have slots for two mechanical drives. One has failed and instead of replacing it with one 6 tb drive I was wondering if I purchased two 4tb WD black drives and used them in a raid 1 configuration that it would be my best solution. I do not need speed on the two mechanical drives. They would essentially be shown as a single 4tb drive, each with the same exact data for safety. I spoke to Dell and they said it is definitely possible. I do not want to affect my c or d drives at all. So, my question is: What software is super simple to use in order to implement raid 1 on the two new identical drives?
I have an existing RAID 5 4xTB Sata 3 in a hypervisor with 4x VMs.
Report sluggish behaviour from users.

HPDL360e Gen 8 Smart P420 1GB RAID.

I am considering breaking this into 2x RAID 1's to improve performance.
Any easy way to do this apart from:

a) copy data
b) kill array
c) new arrays
d) copy data



What is the best RAID with 8 hard drives SAS 600GB, 15k tr/min 6GB/s (HP 517354-001) for virtualization server (VMware ESXi 6.5) ?
Basically we have multiple applications (MS Active Directory, Terminal Server, Oracle, basic file server,...) , one with intensive Oracle Database operations
There's two others array RAID5 SSD total 1TB and RAID1 300GB
Thank you.

Best Regards.
i had a nas storage unit and the mother board on the unit died.

i wwas wondering if i purchase another nas storage without the drives will the new unit accept the drives and will ii be able to have access to the data on the drives.

in simple will the new box identify the raid5 and allow me to copy the data off
I have an HP Gen 9 server with 8 1.2T 10k sas disk (Local) and VMware installed on internal SD card, all disks are currently in RAID 10.
We're having an issues with our SQL server preformance and from what I've read and understand we need to separate the locations of the DB files from the log files, the problem is that even if I'll create a new drive it will still be on the same disk array so it's the same as putting them on the same drive.
My question is this :
Should I break the RAID and create new RAID 10 based on 4 drive each and then put the DB file with the OS on Data store 1 and create a new drive for logs / tempDB and put it on Data store 2 ?
Or do you have any other suggestions?
I can't replace the drive s to SSD because of the price is too high at the moment.
Any help will be appreciated.

Thanks in advance
Trying to install Server 2016 on a HP DL360e Gen 8 v 2.

Cannot boot with images. Intelligent Provisioning cannot see anything useful on the USB stick.

Tried using Rufus, NLite, Windwos 7 USB tool.

Also trying HP USB Key, but when I select the ISO, it says not supported.

I am using Action Packs ISOs downloaded. Also even tried putting RAID drivers on a custom boot using NLite as suggested by someone with the same problem.

I have an embedded RAID and also p420 1GB.
So I have made some logical drives on the P420.

Any ideas anyone... I am a little foxed at this stage.


We have a DELL PE R630 server with PERC H730P RAID controller. It has a RAID 1 VD containing Server 2012 R2 Standard. It has 2 more RAID 5 Virtual Drives containing data. Can an additional Virtual Drive be added with a group of new physical hard drives?

I’ve had two PC’s have an issue where I get the error
From the RAID controller:

RAID -foreign configuration found all drives lost.

The 1st time, not being familiar with the error. I gave the user a new PC, thinking the HD failed.

The 2nd time, I imported the foreign configuration and all seems well.

So my basic question is, does the error:

RAID -foreign configuration found-all drives gone

Mean the drives or controller is failing or unreliable or something else?

Any insight into this issue would be greatly appreciated

Thank you
I have a Windows 8 PC, where the D Drive is a RAID 1 array, using the onboard RAID.  About a week ago, I updated the BIOS, which inadvertently switched my ATA mode from RAID to AHCI (hence breaking RAID).  I didn't notice right away since Windows did not assigned a drive letter to the other disk.  I attributed the boot up failures to the UEFI update, and Windows was able to self correct the problem.

Once I found the problem, I went into the UEFI, changed ATA back to RAID.  The Intel management software showed that the disks were syncing, but it apparently caused corruption in the NTFS partition.  I have lost about a week's worth of data in my Access file, and my backup software (iDrive), has not been backing up my data as I thought it was.  My last successful backup of my Access database was about 2 weeks ago.

Is there anyway of recovering my Access database?  I tried using recuva, but it was run against the RAID array, which showed no recently deleted files.  I might send the hard drives to one of those hard drive recovery companies, but am hoping that there is a cheaper solution available.

Any ideas what I can do to resolve this issue?
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Hi I wanted to use software mirroring to mirror a Windows 10 drive, system actually.  I'm going to use like a 250 ssd, don't think that matters.

I know the older version of windows didn't let you software mirror unless you had Ultimate, or maybee Pro.  

Question, Windows 10, what version comes with the mirroring capability.
I purchased a "YK838 - RAID Controller PCI-E SAS 2-Channel SAS6/IR PowerEdge R510 by Dell."

The Amazon URL of where I purchased this adapter from is here.

What kind of cable adapters will I need that will allow me to connect two Serial Attached SCSI (SAS) hard drives to this PCI controller card?
I have two disks in Predictive Failure on a Dell Poweredge C2100 (Using Open Manage 8.2). We got new SAS drives to hot swap in. I started with the Global Hot Swap (in Predictive Failure) and replaced it with the new drive.

At first it gave the Green Check Mark, "ready" and i could assign it to the Global Hot Swap in the Physical Disks Section but got the attached Caution message. It still allowed me to assign it as a hot swap but was not being recognized as a virtual Disk in the Raid Array. Prior to swapping we could see disk 12 in it's own "Global Hot Swap" section under the other 11 disks in the array.

When i tried the "Create Virtual Disk" and "Assign/Unassign Global Hot Swap" options in Virtual Disks it would not show up as an disk i could select.

When i went back to the "Physical Disks" section the new drive is now showing as "Foreign" and i don't see an option to reconfigure it.

Help is very appreciated.

I have a Dell R720XD running a Perc H710p raid card.

I am in the process of setting it up and want to ensure i can increase the raid capacity at some point down the line.  I have read the H710p user guide (attached) which states that if i use Raid 6 i can add more disks and do an online capacity expansion.

To make sure i have setup a Raid 6 using 4 x SAS drives.

I have then turned the server off and installed a further 4 x SAS drives (Same model and capacity).

When i then go into the raid config using either the OSMA or the CLI there is no reconfigure option or even tasks option as per the below link.


The server and raid controller are running the latest bios versions.

I have also attached a screen shot of what i see in the OSMA.

Please help, thanks

I have what I hope is a quick, easy question.

But not being familiar enough with RAID HD controllers, I wanted to check.

Currently I have a  Dell desktop with a RAID controller and an SSD.  The drive, for the user is nearly full, so I wanted to add another SSD.

What is the best way to add another SSD to a RAID controller so it adds to the  HD space available to the user.

I just wanted to confirm I don’t, somehow do something that combines the drives and clears the current windows install of the SSD already in place.

Thank you
We are setting up a new sql server in our office.  It is a Dell PE R440 w/ 32GB RAM and 4 Hot Swap 3.5" drive bays.  We have four SATA 2TB drives in each bay.  The system has a PERC H730 controller for RAID.  We configured a RAID 5 (3+1) with the last drive being designated as the Hot Spare.  The RAID configure without issue, just a little overhead which brought down the over volume size to just under 4TB.  We are using Windows 2016 Standard Edition.  We boot of the disk and start the install.  The problem is that when it comes to choosing the drive to install too, it shows two Drive 0 drives in the install.  One is 2048GB and the other is 1677GB.  I am assuming that is is due too a 2TB limit but Im not sure.  I know there is a way for the system to recognize the full 4TB but I have not been able to find that information out.  We upgrade the System BIOS to the newest version but still the same issue.  Could us some help on this one as we do not want to setup two separate drives for this server.


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.