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 want to change megaraid_sas code to change some behaviour of my Lsi raid card but till now i am even unable to study the exact behaviour of this code. There is no way to study and change the code.

Please guide me the correct way to go through this code.
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We have OptiPlex 790 with RAID1 which uses 2.5" 7200rpm 16MB buffer 250GB Seagate hard disks ST9250410AS. One of them has failed and we no longer have warranty and I am not able to find replacement in UK (or replacement I found is almost £100 comparing to £50 for much bigger disk).
The computer is working fine on one disk but we need that failure redundant protection so we have to replace the faulty hard disk.

Can we replace it with any size 2.5" 7200rpm  hard disks and it will work but only use 250GB of that new hard disk?

I have Snology DS414 with raid 10 configured, how can I convert it to raid 5.

there are 4 bays and 4 hard drives. I see 7.2 TB (each hdd is 3.7TB) .

Is raid 10 actually mirroring of raid 5 ?
I have 6 1TB hard drives that I intend to use in a RAID 5 (So 6TB minus 1TB for parity is 5TB usuable space.
On the 5TB, I am planning to install Windows 2012/2016 server and use the rest of the space to store hyper-V VM servers.
My question is, are there any likely problems with this disk configuration?
If so, what should I do instead to avoid problems?
Hi Friends,
I have a motherboard with Hardware RAID (Megaraid) in my server,
I installed StorCli for management it in Centos 7 ,
so, when i get disk properties from Storcli, it show wwn for disk,
next, i create disk as JBOD for Show in centos,
when i list my disk as:
ls -l /dev/disk/by-id/

it dont show same WWN in Output StorCli,

can you help me for relation between WWN in output StorCli and in output OS , please?

Thanks for your helps,
Ok, I've set up a RAID 10 four disk array of identical 160GB 7200 HDDs, built on a Gigabyte GA-970A-DS3P Mobo to edit video, but it appears that I've got a problem, Windows 10 Home reports I have three Logical Disks, Disk 0 Basic of 295GB which is online, Disk 1 Basic of 295GB which it also reports is offline because of a signature collision, and Disk 3 Dynamic of 160GB which is online and which it reports as unallocated.

The RAID BIOS has a Logical RAID 10 Drive called Windows, which lists the following

Drive 1 Port 3 160GB
Drive 2 Port 4 160GB
Drive 3 Port ? ?GB
Drive 4 Port ? ?GB

What has gone wrong?  How do I recover from this?
I have an HP DL 380 G7 server, with a mirrored set of SAS drives, with a P410i RAID Controller.

Can I pull one of the SAS drives from a mirrored set, and install a Samsung SSD for better performance?
Is this a terrible idea?
Will it just work?
Is the controller capable of detecting faults on an SSD and kicking it out of the RAID like it would for a spinny SAS or SATA drive?
Does the RAID controller prefer one drive over another when handling read requests?
Is there something special I need to do in order to make it work properly?

I think those are all the questions I can think of for now. We are a small office of 5 people, so we don't have heavy I/O, but would like better performance on our database if we can do a simple upgrade like this with some drives we have on hand.

Thank you
Hi Experts

we have EMC networker and we have EMC data domain DD2500

this type of solaution cost us alot every year for license and support and hardware for data domain

now we are searching for a cheap solaution as a replacment for our data domain

for Newrker we are thining to bug Veeam

but now my quastion only about data domain

i want to ask if i can buy server with huge amount of local HDD disks with raid controller  and 1000 ethernet interfaces

and configure it as NAS server and then we can backup to disk VIA NAS

and here we miss the dedaplication software

any idea about have cheap good solaution to backup to disk

kindaly advice
windows server 2012 r2 installing on hp z440 raid 1 cannot see the drives
Need to replace the raid controller with different type ,I need instructions for how to install without loos data ?
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The user is a photographer and presently has an 8 TB RAID, which is physically carried between two locations every few months.

They now have a decent cable modem connection in the remote connection they use, with an upload speed of 10-15 mbs

Their activity consists of loading in 2-15 gigabytes every week or so, cataloging and adjusting the photos with Adobe Lightroom.  Computers are MacOS X, maintained to the latest version of the operating system that supports Lightroom.  

What's the best way to keep two copies of the RAID in sync over the Internet?  I can set up a VPN.

Hello - I have a server PER710 that I will use for a FTP server. I have c drive set on a RAID 1 and I'd like to have my FTP dir on my DELL Compellent SC220. How would I create a volume on Compellent and have it recognized on PER710 Server?


Hi , I need your help and thanks in advance
I have server 2008 R2 on Dell Poweredge 2950 with 3 SCSI HDD and RAID 5
It made from few weeks blue screen with error code 1E i changed the RAM and it worked again but from time to time made same blue screen error
yesterday i tested all RAM's and when i finished my work and turned on the server it didn't work windows
after control-E screen made a black screen and can not ping on it IP
I have a client with 2 Dell T630 Servers (practically identical boxes purchased about 6 months apart). One runs Server 2012 R2 Standard, the other Server 2016 Standard. Both run Hyper-V. Each box hosts one VM (VHDX files).

I have multiple backups of the 2012 Server (Altaro VM backups, Macrium backups of the physical box, and I’d also make direct copies of the VHDX files as well before proceeding).

The 2016 box hosts a VM with Server 2016 Standard acting as a Domain Controller. The 2012 box hosts a VM running Server 2012 Standard joined to the domain. It is not a secondary DC, etc. – it is only a member Server that runs a database program that multiple users access.

Note - the host boxes are not joined to the Domain – just the VMs are Domain members.

The 2012 R2 box has a hardware RAID 1 array for the OS (Dell Perc H730p Controller). Storage Spaces handles the Hyper-V VM files. The Storage Pool was created as a mirror using 4 Samsung PM863a SSDs.

I needed to add space to the pool. Added 2 more PM863a drives to the Pool. The problem is that 2012 R2 Hyper-V cannot optimize the storage space used, so the 4 original drives are ‘full’ (i.e., they show as being 99% full) and the 2 new drives are practically empty. As I understand it, the 2 new drives will get allocated any new storage as needed.

I’d like to take advantage of the new features of 2016 Hyper-V (one of which is the ability to optimize the storage pool). My question is how to best accomplish the …
This is going to be a fun one...

We have a client that has an HP ML350 G5 running RAID 5 and Server Essentials SBS 2011.  So, we got a call from them that there files on the server all no longer accessible.  When I went out there, I found out that there was 3 sticks of bad memory, but the system would still turn on.  We replaced the bad sticks and I could not get into Windows.  That's when I determined that the array was bad due to a failing hard drive in bay 1 (3 drives total).  We got in a replacement drive and I was able to boot to Directory Services Restore Mode.  The drive was rebuilt and is now part of the RAID.

Told you it would be fun.  Now for the part I'm stuck on.

Hardware is easy, but software is a pain.  I cannot get it to boot into Normal Mode because the Active Directory is broken somehow.  I need assistance on repairing it to get them up and going again.

If it helps, the reason they have a server is for backup purposes of their data.  They only connect to it as a file server, not as a user on the server (if that makes sense).  Though, they do from time to time access it remotely (Web Access).
 I have DELL Poweredge T420 Server with H710 RAID  and like to update all drivers and firmware - BIOS, Chipset, iDRAC, Lifecycle ... etc. Instead of downloading necessary files on each component individually, is there some type of utility program that I can use to install firmware/drivers all together?

Hello, so my 4 drive hardware backplane or RAID card is experiencing a failure, two ports are malfunctioning which caused the RAID to go in degraded state and cause a passthrough disk to fail.  SeaTools didn't find anything wrong with the drive, so I narrowed it down to either the RAID card, the cables, or the backplane, so yeah, rather than spend a lot of time with trial and error, I thought it might be worthwhile to replace all 3 components and try a different setup.

My existing Hyper-V setup involves two RAID arrays on separate cards, a RAID-5 (Areca ARC-1210) and a RAID-1 (Areca ARC-1200).  Both arrays are using Seagate Constellation drives.  The hypervisor boot drive is a standalone disk.  The RAID-1 is used for boot VHDs and RAID-5 used for Data VHDs.  So what I am looking at is replacing my current Areca ARC-1210 with an ARC-1220 which would get me 8 ports.  This would be enough to setup two RAID-5 arrays on the card and then I could stripe them in Windows Disk Management for RAID50.  I already have the six hard drives needed for this.

Let me be clear this is not a production environment, this is just a home lab.  Are there any pitfalls to look out for using RAID-50 with VHDs besides losing two drives on one array?  I don't have enough slots in the case to do RAID-60 and RAID-10 would leave me short on disk space.
This is virtual disk in Raid 5, where Disk 7 is hotspare.
When Disk 11 removed (failure disk), Disk 7 is Rebuilding.
Should I wait for Disk 7 rebuild completely, or I can insert new Disk 11 now?
Dell PowerEdge R510 with PERC H800 Adapter
Many thanks!
I'm installing a Dell PowerEdge R730 Server with 6 units of 2TB SAS drives on PERC H730 Mini controller. I created RAID-1 with 2 drives and installed Win2016 successfully on it. On the remaining 4 drives I created a RAID-5 virtual disk which came to about 6TB. When I boot to windows and go to Disk Management, I  see the 6TB RAID-5 volume split into 2 volumes of 2TB and 4TB respectively. The 2TB can be allocated but the 4TB is grayed out and can't be allocated. The boot is set to UEFI. I need to access the 6TB virual drive as a whole volume with NTFS, kindly advise
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hello i have ibm server where i by mistakely change raid option in bios to ahci..and now when i restart thge server it does not go to login page and it gives me error boot manager failed...can anybody give me the solution..i have in problem.
Hello Experts,

On out Dell MD 3260 we are needing to add the last 13 unassigned drives to build one final array.  Is the process of creating the new Raid a pretty strait forward process?  The host mapping is not something I have worked with in the past. There is a setup tab that has "Create Storage".  Is this the wizard I am looking for?
Hello -

I have swapped out bays 0 and 1 with SSD Drives (850 EVO) and using existing drives 2, 3 4, and 5. I am in the process of setting up RAID on the server. I selected Ctrl + R, got into RAID config screen, selected disk group/controller and pressed F2. I was able to create new VD. I selected RAID 1 and selected all availiable disk I want into RAID 1 (0 &1). All looks like it accepted the change, however I have Disk 2, 3, 4, 5 that I'd like to put into a RAID 10. I cannot select F2 on those drives. It is not letting me configure a new device group. I do not wan to proceed in installing my OS Server 2012 and not have the remainder of disk setup in a RAID. ANy reason why this is not allowing me to setup?



running a Dell R 610 with 2 Disk (Raid 1), I had one disk failure (blinking orange).
computer was shut down, disk was replaced.

after the disk was changed:
 -  RAID 1 was set-up (F10 - sytem service) using express wizard,
 -  computer was boot on Windows 2003 server CD for Windows installation.

when Windows set-up is asking to define the partition, I can see the following:

285562 MB Disk 0 at Id 0 on bus 1 on percsas (MBR)
 - unpartitioned space 285562 MB
55 MB Disk on disk (MBR)
- unpartitioned space 55 MB

As I understand this "55 MB disk on disk (MBR)" is the MBR set-up from the newly installed disk which is keeping its previous MBR configuration (from previous computer. Would you know how to get it removed in order to see only the main disk and only one "unpartitioned space"?

I have seen scattered info but nothing definitive and that has step-by-step instructions.  The obvious hurdles are:
-How do you install Windows when it won't recognize the RAID Array in the Windows installation?
-Can you partition a C: drive at 100GB and a D: drive at 3.9TB? If so how?
I want to get an optiplex - 3050? 5050? to use as a 'server' in a workgroup running win 10. I want that machine to have RAID 1 (enabled in the bios / running intel matrix storage software) I don't see dell offering that setting on their website as you build the machine to buy it.  So the 2 drives you include are JBOD.

I'll have to image the hard drive, configure the array in bios then restore the image?

is there a way to get them to build it as raid 1? or is that a sign that the machines don't support hardware raid?

I do see this page:

that says most desktops can do this... and then tell you how to do it yourself.  vague.


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.