RAID

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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Proliant ML350 G5 with Smart Array 200i embedded.
Firstly the cache battery failed and was replaced with no problem.
The Raid is set up as 2 logical drives with 2 drives in each - mirrored. Logical drive 1 is composed of 2 SAS drives with Windows Server 2012 R2 on it. Logical drive 2 has 2 SATA drives mainly with data.
One of the drives failed in Logical drive 2 with a warning in Smart Storage Administrator and an amber light on the drive. 2 SATA drives identical to the remaining one were purchased and one was inserted with the server off. F1 was pressed on re-starting the server in order to rebuild the array and all seemed to go well, however when it finished Smart Storage Administrator reports 'Logical drive 2 is queued for rebuilding' and on rebooting I am asked to press F1 again to rebuild which it tries to do again.
The second purchased SATA drive was thoroughly tested using WD software and a full delete was carried out. This was then inserted to see if the fault was with the first replacement drive but exactly the same has happened. The rebuild seemed to finish at around 87% complete.
I have looked at what is on the first replacement drive and it looks as though it did mirror successfully. There are no errors in the Smart Storage Administrator reports other than the drive queued for rebuild and the lights on the drive seem to be acting normally.
Any advice would be appreciated.
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I have installed Server 2012 R2 and created 2 VMs (VM-1 a DC and VM-2 a member computer) both running Server 2012 R2. The test bed server I am using has 2-120 GB SATA SSD for the OS in a RAID 1 and 2-1 TB SATA hard drives in a separate RAID 1 configuration for the data storage. They are controlled by the Dell PERC card. I would like for the member computer, VM-2 to be able to access the data volume and see it as just another hard drive with a drive letter. This is a work in progress for me as I am learning and reading articles on how to do this. As a side note when I created the Hyper V folder (300GB) to hold the VM files, I was able to see the data volume from the Hyper V host and located the Hyper V folder there. I was not sure of how much space the VM files would require as the system space requirements grow. I would have preferred to locate them on the SSD...however.
On the member server VM-2, SQL Express, RDS and a business management application will be installed. It should have about 500GB available. All of this will be required to be backed up nightly. Your help and comments are appreciated.
Thanks - HBee3
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Have a desktop, Dell XPS Studio, that came with 2 1TB hard drives set up as Raid 0. One of them is now failing & it won't boot, get the error message "AHCI Port0 Device Error Press F2 to Continue". F2 brings you to the BIOS setup and it's just stuck in that loop.
The client said it boots up every now and then but i've tried it at least 20 times & no joy so reckon it's after getting worse.
Any way of extracting the files from this as they've no backup?
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I was building a small-time home-brew server today from parts laying around and I have a build that is practically brand new. Never used but once or twice. But everytime it powers down, I have to reset CMOS for it to power back up. Aside from that, it works well. I can soft and hard restart it. my RAID array is fine. But if I power it down, I need to reset the CMOS to start it back up.

Any ideas as to why this happens?
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I'm trying )remotely) to help a client check things on a RAID cotroller

I have downloaded the Intel RST Raid Ctrl sofwtare from here http://support.lenovo.com/us/en/downloads/ds041872 but it only shows me the CDRom disk

Is there a sofwtare that can display the RAID config under Windows Server 2012? or do I need to boot into the RAID controller?
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Hi,
 
 I have HP DL360 G5 server with P400 SAS RAID Controller with five 147GB hard drives. It is running VMWare ESXI 5.1. One of the hard drives failed and it showed in amber color. I replaced the bad hard drive in timely manner, but I like to be able to monitor RAID status in a graphical fashion. Beside the VMWare box did not even beep when the hard drive failed.
 In VMWare box, I have several VMs - Windows 2008, Windows 2003 and XP desktop IS.
 I can also utilize a separate workstation PC (running Windows 7 or 10) to run RAID management software if necessary.
 Can you guide me into the right direction?

Thanks.
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Hi,

I am getting this error in HP P410I smart array controller. I have replaced a faulty drive out of 6 with raid 5

Error 785 Background parity initialization is currently queued or in progress on Logical Drive 2 (2.3 TB, RAID 5). If background parity initialization is queued, it will start when I/O is performed on the drive. When background parity initialization completes, the performance of the logical drive will improve.

Please help me. attached the diagnostic report.

Thanks

Sreekanth
ADUReport.htm
ADUReport.txt
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Hello Experts,

Does anyone know the procedure for backing up the Raid module configuration on a Dell MD3260?  We are replacing the Raid module controller battery and have it listed in the steps to save a copy of the configuration file in the MD Management console but it does not have any further instruction.

Thank you,

GTS
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I have three virtual servers running on a pretty hefty machine among like 5 other physical machines. each virtual has its own NIC and it plugged into one of our three switches somewhere. We are having some major slowness on two of these virtuals as far as transfer speed across the network. The virtuals are all server 2012 R2 and all are located on a raid 5.
    My first thought is that we dont have enough throughput between our switches which are Managed Cisco Switches. im about to use LAG to connect these together with increased throughput. Im seeing less than 200MBps to the slow ones and well over 300 up to 600 at least for the rest. i have seen 85 MBps on one virtual and unfortunately that was our DC. i will be putting all the servers on the same switch soon which should not limit throughput as much. is there any settings i need to look for in HyperV manager that could impact this.
   Again all my virtuals are on the same physical machine in a Raid 5. each Virtual is connected to its own NIC as well. the Server and the Switches are all less than a year old. Im using LAN Speed Test from Tutusoft for my testing and we test from multiple servers to another server to have multiple speeds to look at
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I recently replaced a bad disk on a PERC 5 in a PE 840.

The system has been running very slow over the past couple of months and after I ran a chkdsk ,it took over an hour to run on a raid 5 4 X 250 GB disk array.

The company I bought the disks from sent me Dell branded Seagate SATA to replace the Dell WD RE 2's that went bad.
So it looks like I've got 2 WD and 2 Seagate drives(both Dell branded).
The performance seems to be sucking.
My gut feeling is there is a firmware issue with these drives and the controller.

The leds are on all the time on the disks even when it's not busy.

My question is would mixing different Dell OEM drives cause this issue?
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When deploying Exchange 2016, what speed drives did you use for the operating system partition (which also will include Exchange binaries and transport logs if going with standard preferred architecture).  Did you use 7.2K drives, or go for 10K/15K/SSD?  My instinct is to go for faster drives for the OS, but that limits the size which means I have to push the logs to another raid 1 set, which means more servers and increased cost.
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So I made the mistake of buying an R720xd which I now regret, as good 2.5" drives are so much less common and much more expensive.

We have SAS drives for the OS and important stuff, but we need some cheap storage for other files which dont get accessed much. I wanted to opt for 2x WD Black 2TB in RAID 1, but these do not come in 2.5", so I looked around and found a 2TB Seagate firecuda SSHD which was reasonably priced, bought them and they installed fine, setup the raid, RAID controller seemed happy. Boot into Windows and they instantly drop out of RAID and the bays start flashing orange. Ok fair enough, I tried, time to get the Blacks.

So after some research everyone seems to be of the opinion that the 2.5" WD Blacks are no different from the 3.5" model, even stumbled accross a few threads where people where running the 2.5" models in RAID 10 and other configs. So went ahead and bought 4x 1TB WD Black 2.5" and they are now doing the exact same thing as the firecudas, dropping out when Windows boots.

Is this actually a HDD issue or am I missing something?
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How to see the SAS hard disk serial numbers in a Raid 5 configuration array on System x 3650 IBM Server
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Hello,

I have the following situation for Dell Server 2950 with Perc 6/i Raid Controller, the server has 3 Disks Configured as Raid 5 with SAS 300 GB  each and one SATA Hard Disk configured as Raid 0 .
When Clicking Virtual Disk using open manage it shows the following :
Physical Disk 0:0:0 - Online
Physical Disk 0:0:1 - Online
Physical Disk 0:0:2 - Online

Physical Disk 0:0:1 down , we tried to replace it with 600 GB but it did not rebuild but it shows like this in Physical Disks : 0:33 (check attached) Online
We assign it as as "Global Hot Spare" (which is Wrong) and new hard drive has been built as hot spare.

Today we received new 300 GB, so we replace the 600 and it has been built without issues, the Led blinking Amber instead of Green and Virtual Showing like this :

Physical Disk 0:0:0 - Online
Physical Disk 0:0:1 - Removed
Physical Disk 0:0:2 - Online
Physical Disk 0:33 - Online

And status of Virtual Disk is Green, I am attaching some images for more info.

Is this OK ? Can we restart the server ?

Thank You
virtual-disks.JPG
Virtual-disk-0-components.JPG
physical-disks.JPG
Physical-disks-.JPG
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Hi we currently have had a failed harddrive in our server i have replaced the drive i no seem to be gettin a warning as posted below thanks chris
Untitled.png
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I 'm stuck in this problem and have no Ideas.
Can somebody help me, please?
Thank you
Uli
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i have ibm x3200 m3 server with hardware raid 5 configure (4 hdd) with simple swap . so how to know all 4 hdd status. & what to do if os is crash
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Hi,

I bought HP DL380-G4 server from eBay and it seems to work but I'm having problems installing Win 2003 OS- I've 6-hd @ 146 GB/ - I created the RAID containers- 2-RAID-1 and 3-RAID-5.  I tried to separate 6th had as a spare but I unsuccessful or couldn't figure out how to-?
This is my home network- lab I want to practice with it before joining the server team in a month or so.  
I tried to run SmartStart 8.70B for x64 and booted to the CD but it ran for a good 5-7 minutes loading but then I was left with a HP screen and no activity. So I decided the power down the server.
Windows is not able to see the hard drives? What am I missing here?
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I have a problem to resize my hardisk from the Raid bios. There is no option to resize. So I move to command line.

The actual size of the disk is 1TB but Virtual disk only show 571GB.
root@main [~]# MegaCli -LDInfo -Lall -aALL


Adapter 0 -- Virtual Drive Information:
Virtual Disk: 0 (target id: 0)
Name:
RAID Level: Primary-1, Secondary-0, RAID Level Qualifier-0
Size:571250MB
State: Degraded
Stripe Size: 64kB
Number Of Drives:2
Span Depth:1
Default Cache Policy: WriteBack, ReadAhead, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU
Access Policy: Read/Write
Disk Cache Policy: Disk's Default
Virtual Disk: 1 (target id: 2)

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The disk that should be raid as below;
root@main [~]# MegaCli -PDList  -aALL

Adapter #0

Enclosure Device ID: 252
Slot Number: 4
Device Id: 22
Sequence Number: 1
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
Raw Size: 953869MB [0x74706db0 Sectors]
Non Coerced Size: 953357MB [0x74606db0 Sectors]
Coerced Size: 952720MB [0x744c8000 Sectors]
Firmware state: Unconfigured(good)
SAS Address(0): 0x73a13c2fa27fc39f
Connected Port Number: 4(path0)
Inquiry Data: ATA     WDC WD1003FBYZ-01V03     WD-WCAW3K9A34RC

Enclosure Device ID: 252
Slot Number: 5
Device Id: 21
Sequence Number: 2
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
Raw Size: 953869MB [0x74706db0 Sectors]
Non Coerced Size: 953357MB [0x74606db0 Sectors]
Coerced Size: 952720MB [0x744c8000 Sectors]
Firmware state: Online
SAS Address(0): 0x738d3620a180a892
Connected Port Number: 5(path0)
Inquiry Data: ATA     WDC WD1003FBYZ-01V03     WD-WCAW37322576

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I have add another disk and using below command to resize.

root@main [~]# MegaCli -LDRecon -Start -r1 -Add -PhysDrv[252:4] -l0 -a0

Failed to Start Reconstruction of Virtual Drive.

Open in new window


I read from this link : https://serverfault.com/questions/729711/lsi-replace-disk-in-raid1-with-larger-drives-how-to-expand-raid-to-use-free-spa 
I could expand to use Free disk space but unfortunately not working as expedted.

root@main [~]# MegaCli -LdExpansion -p100 -Lall -aAll
Invalid input at or near token -LdExpansion

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Appreciates that anyone could help.

Thanks.
0
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I have this server with 1 tb x 4. Inside I have 4 cables in one
I also have another 1 tb

How to raid all five in one?

In F2, three is option to select raid with 4 drives by a click
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Hi,

I ejected each of the two disks in my Readynas NV+ v2 NAS in order to remove dust in the bay. Following this my NAS no longer mount the drives.

When I insert one of the drives it says "new disk added" in the lcd display. Is there any way to recover the content of the disks?

Web interface also stopped working and only shows "permisson denied" message when I try to access the site without presenting a login screen.
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I have a customer with a Dell PowerEdge T320, the main drives are running RAID 0 and then they have (3) 1TB drives running RAID 5.  Last week, drive 4 came up with a PDR1101 error but everything seemed to work.  When I had this before, I just swapped the drive with a new one and RAID took over and wrote everything to the new drive.  This time, I swapped it and everything was working fine - I could access all the mapped drives so left the site.  Today they tried to get into their programs and there is only one mapped drive showing and it says that new drives must be initialized.  I tried to put in the old hard drive but get the same message - thoughts?  The system is running SBS 2011
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I have a hp ML350 g9 server which is configured with RAiD 5.  It has 4 SSD hard disks.  recently we had a power outage and our master boot record is damaged, and I can only get to "the drive where windows is installed is locked.  Unlock the drive and try again.  I cant fix this, so wanted to restore the whole windows backup I have.  

When I launch from the CD, I go into the option to restore, but when I select the target destination, there is no drive showing.  I went into the HP untility and can see the array there, but not when I launch from CD and try to run the backup.  

i did a fresh install just to another single disk, and still when I launch off the CD, i cant see the disk when I try and run the recovery.  I think im having the same issue where the drive cant be seen because I don't have the drivers for the smart controller.  I tried those links you provided, but they are just executables.
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I have a hp ML350 g9 server which is configured with RAiD 5.  It has 4 SSD hard disks.  recently we had a power outage and our master boot record is damaged, and I can only get to "the drive where windows is installed is locked.  Unlock the drive and try again.  I cant fix this, so wanted to restore the whole windows backup I have.  

When I launch from the CD, I go into the option to restore, but when I select the target destination, there is no drive showing.  I went into the HP untility and can see the array there, but not when I launch from CD and try to run the backup.  

i did a fresh install just to another single disk, and still when I launch off the CD, i cant see the disk when I try and run the recovery.  I think im having the same issue where the drive cant be seen because I don't have the drivers for the smart controller
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Hi,

I have a HPE ProLiant DL360 G7 Server which has stopped responding so its been powered off/on and its not picking up the boot drive. The server has 4 drives in raid 5 and all of the drives are showing online and good health (no amber or red leds). How do I fix the raid array so it detects the boot partition etc? Its currently booting up and then just trying to boot from CD Rom or Network. I cannot get as far as windows. the server is out of warranty so I need to work out how to resurrect it without loss of data etc.

Is there some raid utlities which can be accessed?

Thanks
SycamoreIT
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RAID

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.