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 ...

learn more… | top users | synonyms

2
votes
1answer
1k views

why does windows 2008 resync software RAID after a power outage?

i had a power outage. before the outage my RAID 5 (4 SATA drives) was fully synced. perhaps I was doing some trivial writes during the poweroutage, but afterwards windows decided it has to do a ...
2
votes
1answer
1k views

Does windows support hard drives larger than 2tb?

I have 6 x 500Gb drives formatted in raid 5. I have installed Windows Server 2003 R2 on 20Gb of this and want to format the rest as a backup drive (2.2Tb) is this possible? I have found the following ...
2
votes
1answer
797 views

Can I boot from a software RAID5 setup with linux?

I am planning the setup of a new NAS system, deciding if using Openfiler or something similar. I've been checking some RAID cards, and thinking about hardware failure or substitution, and I have the ...
2
votes
5answers
1k views

Dell 2950 with 6 disks, is 2 x 3 RAID 5 arrays possible?

I have a Dell 2950 with 6 disks, I'd like 2 RAID 5 arrays 3 disks in each array. The RAID manager only allows me to create 1 array, after the array is created I can't create another. Why would this be?...
2
votes
3answers
4k views

Server 2008 RAID5 resynching

I built a W2K8 R2 server last weekend, and built a R5 array using Disk Management, 5x 1TB drives. For the next 60 hours the status said 'Resynching (X%)' as it built the array. during this time i did ...
2
votes
5answers
589 views

Is it possible to construct a RAID 5 array from an existing disk?

I'm going to get my new small business database server in a couple days. It comes with one hard drive, but I plan on setting it up initially with a 3 disk RAID 5 system. Unfortunately, the extra ...
2
votes
5answers
659 views

Expected throughput when re-building RAID array?

I'm just doing some testing on a NAS RAID array we've been lent to see if we want to deploy it. Just to see whats what, I decided to see what kind of network performance we get when it's re-building a ...
2
votes
2answers
164 views

Failed Dell PowerEdge T410: Move Hardware RAID PERC H700: 3 x 300GB SAS (1 faulty) to 2nd T410 for Disk Cloning & Boot

Failed Dell PowerEdge T410: Move Hardware RAID PERC H700: 3 x 300GB SAS (1 faulty) to 2nd T410 for Disk Cloning & Boot FYI - PRE QUESTION CONTEXT: We barely got the original T410 up once ...
2
votes
1answer
100 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 ...
2
votes
1answer
254 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 ...
2
votes
1answer
383 views

How to resize Windows partition after conversion from RAID 1 to RAID 5?

I'm using Fujitsu PRIMERGY RX200 S6 with RAID controller RAID Ctrl SAS 6G 5/6 512MB (D2616) I've migrated RAID 1 (2 discs) to RAID 5 (4 discs) without any problems and on the fly without restarting ...
2
votes
2answers
957 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 ...
2
votes
1answer
428 views

Partitioning and configuring a RAID array for a dedicated MySQL server

I'll be running ubuntu server on a 3 disks server (450 GB each) and 16 GBs of RAM. My target at the moment isn't configuting MySQL itself, but what could be the best RAID configuration for my case ...
2
votes
2answers
8k views

Windows Server 2008 R2 Software Raid 5, Resynching (4 days so far)

I have a software raid 5 of 5x1,5Tb harddrives, this raid has been made in Windows Server 2008 R2. Now I know that Resynching can take a lot of time to be preformed, but so far have it been running ...
2
votes
3answers
4k views

mdadm: Swapping out small hard drives for bigger ones in a RAID5, How to partition?

So I got the gist of swapping out smaller hard drivers for bigger ones in an MDADM RAID5: Fail and remove one drive. mdadm -f /dev/md0 /dev/sdd1 mdadm -r /dev/md0 /dev/sdd1 Shutdown, swap the ...
2
votes
1answer
1k views

mdadm raid5 failure. set wrong drive to faulty by accident

noticed a degraded raid where /proc/mdstats marked one device as down. so i wanted to set the missing drive to faulty and reattach it. somehow i got the wrong drive, leaving me with an unworking ...
2
votes
1answer
548 views

How long should the initial creation of my RAID 5 Array take? This seems ridiculous

I'm building a raid 5 array with 3 1.5TB drives on CentOS 5.5 using mdadm. Everything seems to be working fine, except it's taking forever and I'm not sure if that's normal. It's going on 6 hours ...
2
votes
2answers
143 views

Expanding a RAID 5 partitions on Dell T610 with PERC 6 with Windows 2008 R2

Here is my dilemma fellas, I have a Dell Poweredge T610 with a PERC 6 RAID controller running on Windows Server 2008 R2. OLD configuration: 3 x 1 TB SAS Drives in RAID 5 configuration I ...
2
votes
1answer
161 views

Replacing a Self encrypting Hard Drive in an IBM xseries server raid

I have a failed drive in a RAID 5 array in an IBM x3650, Machine Type 7945. The RAID is composed entirely of original IBM SED SAS drives, 300GB ea. Unfortunately I am the purchasing Tech, not the ...
2
votes
1answer
110 views

Are RAID 5 systems suitable for larger disk sizes?

Why is it generally considered that RAID 5 systems are not suitable for larger disk sizes? Is the same true for RAID 6?
2
votes
2answers
994 views

Missing VirtualDisk on bootup (RAID)

I have a Dell PowerEdge 2950 with DAS storage attached (MD1000) I rebooted the server to apply window updates (win2008), on restart BIOS detected a VirtualDisk was missing and wanted me to continue or ...
2
votes
1answer
165 views

Building a Server to host Virtual Machines

I'm looking to put together a server with the base OS as Windows Server 2008 with Hyper V. This machine is a development box that will be hosting multiple VMs for development - test instances of ...
2
votes
2answers
4k views

Moving a RAID-5 array from a dead HP ML350 G5 to an HP DL380

We have an HP ML350 G5 with a 3x72GB RAID5 array that we were in the process of decommissioning. After shutting down the server and moving it, but prior to moving the data elsewhere, the server ...
2
votes
2answers
717 views

Growing a Linux software RAID5 array

On my home file server, I've got a 1.5TB software RAID5 array, built from four 500gb Western Digital drives. I've got a fifth drive that I usually run as a hot spare (but have out of the array at the ...
2
votes
1answer
3k views

mdadm raid5 superblock is missing

I had a 3 disk mdadm raid5 volume (made of /dev/sd[abc]) that was in the middle of a reshape, going to 5 disks (adding /dev/sd[df]), when the power to the server failed. this is on ubuntu 8.10 ...
2
votes
1answer
742 views

How to grow mdadm RAID5 into degraded state?

mdadm - v3.2.5 - 18th May 2012 Currently have: Version : 1.2 Creation Time : Tue Jun 25 19:03:31 2013 Raid Level : raid5 Array Size : 2930135040 (2794.39 GiB 3000.46 GB) Used ...
2
votes
1answer
277 views

missing files after reassemble of RAID-5

I had to open my file-server's housing on Sunday to replace a faulty fan. What I didn't see was that one of the sata-cables was not properly connected. The 1st thing I did after a reboot was a check ...
2
votes
1answer
101 views

Is my server toast?

Last night I received an e-mail from mdadm about the possible failure of two drives on my array. The raid array was set up as a 4 2TB drive raid5 with one hot spare. Is this system truly fried? Did ...
2
votes
1answer
770 views

What was the default chunk size in previous versions of mdadm? Is there a way to set data/super offset? Trying to recreate a raid 5 md with all spares

I have a 6 device raid 5 array which had 1 disk go bad and then due to a power outage, the machine shutdown and when it started all the disks were showing up as spares with the following mdadm -E ...
2
votes
1answer
973 views

Windows Server 2008 R2 software Raid-5 slow over network

I'm using Windows Server 2008 R2 for my file server. I put a 7x1TB software raid-5 on it, and let it resynch. OS is installed on a separate disk. Now I'm getting very poor write speeds to the raid ...
2
votes
1answer
80 views

ProxMox with PERC 5/i RAID 5

I recently set up a dell 2950 III with ProxMox. I attached an external hard disk that is used to boot ProxMox and I would like to use the RAID 5 array to store data such as images and disks. How would ...
2
votes
1answer
799 views

HP Code 341 “Physical Drive State: Predictive failure. This physical drive is predicted to fail soon.”

this is my first post so bear with me here :-) Background: I have a RAID5 setup with 4 disks that have been working perfect for years. After one drive failed, I installed new drives which where ...
2
votes
0answers
165 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 ...
2
votes
2answers
243 views

Must a disk be formatted everytime it is removed and reinserted into a raid5 server?

I'm very new to RAID servers, in fact I'm new to any kind of server management, so please forgive me if this question is badly phrased. I'm considering buying a RAID5 server with four 4TB drives. I ...
2
votes
0answers
236 views

raid 5 mdadm drive dropped whilst growing

I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk. ~# mdadm --add /dev/md1 /dev/sdb ~# mdadm --grow /dev/md1 --raid-devices=5 midway through the grow I recieved this in ...
1
vote
4answers
1k views

replacing drive in raid 5 array with non-standard disk

I have a Raid 5 array made up of three HP brand 10k rpm SAS-6G drives with 146 gb size. One of the drives is telling me from its LED that it needs replacement. When I ordered a replacement I found ...
1
vote
4answers
34k views

Can I recover a RAID 5 array if two drives have failed?

I have a Dell 2600 with 6 drives configured in a RAID 5 on a PERC 4 controller. 2 drives failed at the same time, and according to what I know a RAID 5 is recoverable if 1 drive fails. I'm not sure if ...
1
vote
2answers
426 views

Windows 2003 Server R2 system partition full - move and/or expand

PROBLEM: My System (C:) and Data (D:) partitions are full and I need to expand them or move them to larger drives. SPECS: Dell PowerEdge 2900 server Adaptec 39320A SCSI adapters Dell Perc 5/i RAID ...
1
vote
1answer
298 views

RAID5 Array issues - copy data or replace drive first

I have inherited a critical situation as follows. 2 x 16-Disk RAID5 Storage systems (one holding master data, one holding backups) Backup system had no monitoring and two disks failed so all data ...
1
vote
2answers
163 views

Raid 5 fail safe

In a 4 300 GB disk raid 5 setup, the usable space is 900GB. So in the event that one of the hard disk fail, is it that the space available for write will drop to 500GB? It is right to said that in ...
1
vote
4answers
2k views

How do I Change a damaged Disk in a Raid 5 array

I have a server with a 4-drives Raid 5 array; one of the disks is damaged. All the disks are hot pluggable. My Question is, I want to replace the damaged disk with a new one, do I have to shutdown the ...
1
vote
1answer
297 views

Raid 5 and Power Supply damage?

Because I build a RAID 5 atm, I wanted to ask, what would happen if the server with a raid 5 in it (like 4-5 hdds) would have a power supply damage? Can I just switch the power supply and my data is ...
1
vote
1answer
1k 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
1
vote
1answer
924 views

Completely replacing (upgrading) a RAID 5 array of disks on an ESXi server

I have a development server that runs several VM on ESXi 5. It has an array of disks in the RAID 5 configuration where all of the disks are currently the same size. I would like to expand storage on ...
1
vote
4answers
1k views

Raid 5 rebuilding epic fail

Someone has asked me to rebuild a faulty raid 5 on a 3ware raid controller. I have 3 drives, all of them is 160 GB. I've gone through the steps, ie selected the degraded array unit, and then gone over ...
1
vote
2answers
2k views

Is 5MB/s a reasonable speed for Dell Software Raid Controller in Raid5

I have a new PowerEdge T320. Details are: Intel Xeon E5-1410 @ 2.8 GHz 16GB Windows Server 2008 r2 configured as Domain Controller Dell PERC S110 Software Raid 4x 7200 rpm 1TB drives configured in ...
1
vote
1answer
2k 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) ...
1
vote
2answers
2k views

MSA20 RAID5 recovery failure due to URE on another disk

I have MSA20 with one disk array on 12 disks and 3 LUNs on it (each raid 5). A few days ago one disk in one of the LUNs was failed and I replaced it. But raid5 recovering failed at 13% and I see in ...
1
vote
2answers
171 views

NAS Hard drive configuration advice?

Just got a 4 bay NAS. I want to set it up as optimal as possible. I was thinking of getting 3 x 1TB hard drives and setting up as RAID 5. The disk usage will probably be around 1TB max but there is ...
1
vote
2answers
1k views

Smart Array E200 - merging logical drives

Server has Smart Array E200 RAID controller with 8x 146GB SAS 10k drives: I have two logical drives. First set is RAID5 with 3 drives and second set RAID5 with 5 drives. Is there a way to merge ...