RAID (redundant array of independent disks, originally redundant array of inexpensive disks[1][2]) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels", depending on what level of ...

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RAID 5 Recovery software help - Test Disk

on the test disk website: http://www.cgsecurity.org/wiki/TestDisk it states that it can be used to recover data off raid 5 has anyone found any guides on how to do this? or if someone knows how ...
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Server 2008 RAID 5 Write Speeds

I recently configured a RAID 5 partition in Server 2008 with 4 RAID 5 disks. These disks are connected through a SATA expansion card that uses PCIe. This morning, I checked and they had finally ...
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Windows 2008 R2 server software RAID-5

After one of the reboots (normal one after windows update) Windows 2008 R2 marks software RAID-5 disks (OS-Based) as "Invalid". RAID structure is intact - I can see it via R-STUDIO. All data are OK ...
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What counts as a 'large' raid 5 array?

A recent issue with a Buffalo TeraStation NAS here in my office has got me investigating Raid 5. I've found a few different articles talking about the unsuitability of using raid 5 in large arrays, ...
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How can you force linux software raid not to disable a disk for recovery?

I'm trying to recover data from a RAID5 array. 2 of my 4 disks unexpectedly failed at the same time. I am able to start the array by forcing it. mdadm --assemble --scan --force The array starts up ...
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Can a RAID5 be corrupted if Drive 0 has been failed and how could this be fixed? [closed]

I have configured RAID5 on an ASUS server and installed VMware ESXi 4.1 on it. The attached photo indicates that Drive 0 resides in a Failed state. All Hard Disk Drives (HDDs) are running Normal. ...
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1answer
33 views

Can I pull raid 5 disk from IBM X365 to put into another X365

I have an IBM X365 that is sitting in a corner. It has the same size drives as the IBM X365 that has a failed drive. Both have Raid 5. Can I pull drive from the one sitting in the corner and ...
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1answer
35 views

Raid 5 URE rate [duplicate]

I've recently read this post: http://www.standalone-sysadmin.com/blog/2012/08/i-come-not-to-praise-raid-5/ tldr; It basically says that the error rate of a RAID system is tied to the hardware, and ...
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1answer
36 views

Optimize unused space in RAID5 due to bigger HDD in spare parts change

I have started with 3x250 GB SATA array, but the old HDDs failed one by one and when the spare parts came they where bigger disk inside and I recently ended up with 3 HDDs of 500 GB. I see ...
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2answers
198 views

How to identify which hdd to be replaced in RAID

Our RAID5 (using Adaptec 3085) stopped working because one of the hdd is broken. How can I identify which one it is?
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7answers
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RAID-5: Two disks failed simultaneously?

We have a Dell PowerEdge T410 server running CentOS, with a RAID-5 array containing 5 Seagate Barracuda 3 TB SATA disks. Yesterday the system crashed (I don't know how exactly and I don't have any ...
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1answer
389 views

Repair HP SmartArray p410i

i have an HP proliant server and in the last 4 years i never had a single problem with it. but yesterday i found out that i cant remotely login to my server so i went over and found that one of three ...
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1answer
65 views

When exactly does a RAID5 reconstruction happen?

Let's assume the following scenario: A RAID5 array consisting of 3 disks is happy and running One of the disks crashes We replace the broken disk with a spare one The system is up and running again ...
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1answer
1k views

Cannot reactivate RAID-5 volume: The size of the plex member is invalid

We had a 3-drive Windows Server 2008 R2 RAID-5 fail (operating in redundancy mode): WDC 1 TB WDC 1 TB WDC 1 TB We removed the failed hard drive, and put a WDC 1 TB drive (that we had standing by) ...
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1answer
29 views

Reading /proc/mdstat

I just built my first raid5 yesterday (with 4 hds) and was reading about monitoring with /proc/mdstat. My understanding is an ideal dispaly with 4 drives should be [UUUU] however mine reads [UUU_]. ...
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4answers
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How do I configure RAID 5, especially stripe size, with 24 x 1.2 TB drives for CentOS 6?

For a Dell R920 with 24 x 1.2TB disks (and 1TB RAM), I'm looking to set up a RAID 5 configuration for fast IO. The server will be used to host KVM VMs that will be reading/writing files of all sizes, ...
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2answers
567 views

3Ware 9500s Raid array not visible in Windows 7 x64 disk management - latest firmware and drivers

I bought a used 3Ware 9500s-4LP raid controller from Ebay (the old 3ware 8506-4lp didn't support RAID arrays over 2TB, but it was working), installed it in my server and attached it to the SATA ...
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2answers
307 views

What steps should I take to best attempt to recover a failed software raid5 setup?

My raid has failed, and I'm not sure what the best steps to take are in order to best attempt to recover it. I've got 4 drives in a raid5 configuration. It seems as if one has failed (sde1), but md ...
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0answers
47 views

Server 2012: Should I use Cached Exchange Mode with Terminal Server?

The setup is a (all brand new) single physical Dell server, with 32GB RAM, running Server 2012. This has a single 3-disk RAID 5 array (DELL PERC) mapped to 3 volumes in Windows. They are SAS disks. ...
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1answer
170 views

DELL PowerEdge 2950 stuck on BIOS

My DELL PowerEdge 2950 is Stuck on BIOS 2.7 screen and does not advance at all, keyboard is not responding either. How should I troubleshoot this issue? Here is the screen
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1answer
38 views

Is it possible to install OS during RAID scrubbing?

One of our servers crashed a few days ago. I had to recreate the RAID container with the remaining disks. Currently the system is running the scrubbing process (screenshot below). I would like to know ...
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1answer
535 views

Dell PowerEdge R720 - Corrupted RAID

Apologies in advance for the lengthy question. We have a Dell PowerEdge R720 server with: 2 x 136GB SAS drives in RAID 1 for the OS (Ubuntu Server 12.04) 6 x 3TB SATA drives in RAID 5 for data A ...
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1answer
165 views

Large write with dd fail on RAID-5

I have a server with a RAID controller which connects to a JBOD over SAS. JBOD is populated with 16 SAS-HDDs of 3TB (8 of one make and 8 of other, same rpm). I have configured 3 logical drives with ...
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3answers
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Recover from a Punctured RAID array

here is my situation. I have a Dell Server with a Dell Perc 7i controller, (LSI Controller). I had a drive give me an Failure Predicted warning so I called their support and they came out and ...
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1answer
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Replacing Hard drives/RAID array Dell Poweredge 2900

I have a Dell Poweredge 2900 that I'm upgrading from 4x SATA 250GB Drives in a RAID 5 situation to 2x SATA 1TB Drives in a RAID 1 situation. The box is running Windows Server 2003, with a PERC5/i ...
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4 Disk - RAID(5) - 1 alleged faulty drive

I have a OWC Mercury Pro Elite Qx2. I have 4 4TB Hitachi drives setup on a RAID 5. One day, the red light came on indicating that my C drive has failed. I took it out, and put it on my docking ...
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1answer
69 views

LSI Raid 5 with 2 disks “not synced”

I have a system with a LSI 1064e SAS raid. The system is not booting, and when I enter the raid configuration utility, It says, that has 2 disc "Not synced". I didn't find the option to resync them, ...
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64 views

Raid 5-Disk Faulty [closed]

I have the following Raid-5 Configuration with one disk faulty. http://i62.tinypic.com/2z6rxck.png I need to do a swap out. Not sure with the current configuration if it will affect the other disks, ...
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1answer
39 views

Raid 5 on two scsi buses with different maximum speeds

I'm quite a noob, I'm trying to set up as a study machine an old HP ProLiant DL385 G1. I've configured a RAID 5 out of six SCSI 3.5" HDDs using: - Smart Array 6i controller; - (4 x SCSI Ultra320 ...
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2answers
497 views

Risky to have RAID5 with 3x3TB drives? What alternatives should I be considering?

A drive dropped out of my raid 5 array yesterday. It looks like the reason was due to a bad controller so I switched it out and attempted to re-add the drive but mdadm claimed it couldn't do it. So I ...
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1answer
105 views

Removing all disks from RAID5 and adding new disk for access/data destruction - will RAID be preserved?

We have a RAID5 array and limited resources. It has been suggested, for data destruction of a SAS drive with a bad sector, to remove ALL drives from the RAID5 array, and then place this 1 drive into ...
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Which is better: RAID5 + 1 Hotspare / RAID6?

Just curious, I have 6 x 1TB 7200RPM Near Line SAS for my new server. I can either configure it as RAID5+1 Hot Spare or RAID6. What should I choose?
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Migrate unix-system to hardware RAID-5 possible?

At the moment, I have a Intel SR2500 with 5 disks running at home. 4 of the disks aren't used at the moment due to maintenance-reasons. Because it's an expeiment-laboratory-machine where I can try ...
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3answers
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What are the main points to avoid RAID5 with SSD?

My understanding is that an SSD has a limited amount of writes. RAID5 performs many writes due to parity information across the drives. So reasoning states that RAID5 would kill and lower the ...
3
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1answer
81 views

how to determine which drive belongs to which slot on raid 5

i have an HP DL380 G8 machine with 4 hard drives of same size and running on raid 5. unfortunately during a service process of our data center one of the junior team members pulled out all four hard ...
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1answer
60 views

Raid 5 verifying

Good day every one, i all ready read this RAID 5 detects write errors? I have raid 5 on "3 ware" controller i want to ask: - do i need run from time to time verify schedule or i can use only ...
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1answer
524 views

logical drives on HP Smart Array P800 not recognized after rebooting

We had a Smart Array P800 configuration working fine (RAID5). Physically, we have a disk enclosure (like this) connected with a Linux Server. Here is what happened: This server was accidentally ...
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228 views

Linux software-RAID4/RAID5 and CPU usage

In case of RAID4 or RAID5, for each stripe of data bits, a parity bit is stored. For example if I write 0 to drive A and 1 to drive B, then parity bit 1 is stored to drive C. Isn't this a huge load to ...
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2answers
148 views

Is mdadm RAID Toast?

I took all my drives out and put them onto a new cpu/mobo. (upgrading) I boot up and mdadm claims it can't boot my degraded RAID. /dev/sdb sudo mdadm --examine /dev/sdb /dev/sdb: ...
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1answer
49 views

2 disk RAID5 Linux software array

(I've posted this on Serverfault as I suspect it a bit to technical for Superuser. If I'm wrong please move it where appropriate) I am remotely looking at a device which identifies as ReadyNAS ...
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1answer
132 views

RAID 5 drive upgrade

We have an HP ProLiant ML350 G5 server with an 8-bay RAID 5 array configured on a Smart Array E200i controller. The system volume and data are on the same logical drive. The drives are 72GB each and ...
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0answers
51 views

Safer RAID5 rebuilds using partially failed disks? [closed]

There have been lots of articles posted recently about how RAID5 is dangerous because of long resilver times, and in particular because of increasing chances of encountering a URE during the resilver. ...
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74 views

dmraid lists disk as “spare”, even though it was part of the array

It was setup as a RAID5, 4 disk array of /dev/sdc -> /dev/sdf. sdf failed, leaving the array in a degraded but operational state. A misguided attempt to restore the array led to one of the working ...
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91 views

Why don't enterprise RAID controllers support migration from RAID 5 to RAID 10?

I've been doing some research on the possibility of live migration from RAID 5 to RAID 10 and I'm curious as to why it seems that most RAID controllers (particularly Dell's PERC controllers) don't ...
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Recovering Linux soft raid 5, disk stays as spare

I got disk failure on my Centos Linux soft raid 5 array (mdadm). I replaced one of the disk and started to rebuild the array. Next time I checked the status, the rebuild was failed. This is the ...
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898 views

How to recovery a 5TB raid 5

We have a 5TB raid 5 virtual disk cluster... I think the MBR got messed up and windows server 2003 no longer is able to view the contents of the virtual disk... All the disk recovery software I have ...
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680 views

Proxmox and PXE boot

I have 10 rack servers, each has an 80 GB hard drive, and a Dell PowerVault with no hard drives. It is possible to take all these hard drives and put them in the PowerVault cluster, then boot proxmox ...
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Expanding a RAID 5 array on Adaptec

Ive got a RAID 5 array setup on an Adaptec 7805. The current array is setup on conn 1 (4 disks). And ive added a new disk to conn 0. All same capacity and type. How can I expand the array on ...
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1answer
34 views

Raid5 status is checking means?

I noticed the following messages on my system: Personalities : [raid1] [raid6] [raid5] [raid4] Md3 : active raid5 sda5[0] sdc5[3] sdb5[1] 3858519040 blocks super 1.2 level 5, 512k chunk, ...
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Deleting Intel RAID 5 Volume Without Losing Data [closed]

I wish to stop using RAID 5 and return to a series of individual drives. How can I do this without losing the data? I'm using intel rapid storage technology