A type of RAID redundancy that includes parity data spread across a number of member disks

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Setting up a home shared RAID storage on a desktop Win7 computer

I have a desktop computer running Windows 7 Ultimate. We are several at home to use that computer, mainly to watch movies, listen music, store (hundreds of thousands) pictures of family events through ...
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11 views

hard drives - what is stripe group size given stripe unit size?

If I know a hard drive's stripe unit size is 16 KB, am I able to calculate the stripe group size? For example, is it 4 times 16 as a rule, or does the group size simply need to be some multiple of 16 ...
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1answer
40 views

Is it safe to stop a RAID 5 expansion?

I'm having some issues expanding a RAID 5 array on a Synology DS413. The drive has gone from 3 x 3TB WD Green drives to 4 x 3TB. I started an expansion operation and it's been stuck at about 60% and ...
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2answers
20 views

MDADM says can't assemble RAID5 because missing disks but all disks are there

To start this, I installed a SATA expansion card so I could get more Drives into the computer. I moved the RAID to the expansion card, after attempts failed to get the OS SSD onto them. There was a ...
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23 views

How can I re-establish my RAID5 Array (Intel Rapid Storage)?

I had a RAID 5 array, but two of the drives dropped from the array. (While troubleshooting another issue ASUS suggested I update my MoBo BIOS, but neglected to tell me this would corrupt my RAID ...
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32 views

Migrate Windows Server 2003 to Windows Server 2012 with Raid 5

What should i consider when migrating from Windows Server 2003 to Windows Server 2012. I have a raid 5 configuration, so i don't want to lose any data (+/- 6 TB)
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34 views

How do I fix an ntfs filesystem on a RAID5 volume?

I have a RAID5 volume with an ntfs filesystem of which chkdsk keeps telling me there are 5 unindexed files. I can't take the volume offline during the workday, so I run chkdsk /f on it, and then say ...
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66 views

windows server 2012 span multiple raid 5 arrays

I have some old hard disks that I want to get as much out of them as possible for space. Currently, I have: 2 x 200 GB HDD 2 x 500 GB HDD 2 x 1.0 TB HDD 1 x 1.5 TB HDD If I combine them as ...
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34 views

OCZ Vertex 4 64 GB timeouts on Areca 1880IX-16-4G

I use 3x OCZ Vertex 4 64 GB in RAID5. If they work then it's all ok, but suddenly random drives are dropped from array with timeout errors. Sometimes even two of them which causes filesystem errors. ...
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95 views

Is it possible to convert a btrfs RAID5 to a RAID6 with the same disks without losing data?

How would I convert an existing RAID5 (single parity) btrfs setup to a dual parity RAID6 configuration given enough free available disk space, using the same disks, without swapping out data ? ...
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1answer
27 views

Format system and preserve RAID

I have a system on an SSD, and beside that, a set of 4 disks are connected over software RAID 5. I have a problem with that system now and I'd like to format that system and install a new one. If I ...
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17 views

Extending a raid5

I think i did a horrible mistake while trying to extend my 4 x 3TB raid5 to a 6 x3TB Just after adding the 2 disks with the IRST, I spanned the 2 disks to the initial raid5 with the windows Disk ...
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1answer
5k views

Ubuntu Server 14.04 - RAID5 created with mdadm disappears after reboot

This is my first question on superuser, so if I forgot to mention something, please ask. I'm trying to set up a home server which will be used as file server and media server. I installed Ubuntu ...
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1answer
498 views

RAID5 vs RAID4 purpose of floating parity

I still did not get why is RAID5 better than RAID4. I understand both computes parity bits that are used for recovering if some failure occurs, the only difference is in storing those parity bits. I ...
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44 views

Is it safe to transfer files to a raid 5 array while it is re-synching?

I have a newly created raid 5 array in windows server 2008 (software in windows disk mamanger) and it is resynching... Is it safe for me to start transfering/copy files to the volume while it is ...
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50 views

Skip initial resync on a new Windows software RAID 5 build?

I just added 8x4TB and created a software RAID5 volume. Server 2008R2. Based on progress so far, it's going to take 8 days to complete the resync. I'm not a busy man, but that's asking a lot. ...
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1answer
91 views

Setting up a RAID 5 Array

I am currently trying to convert my drives from just a bunch of external disks, each one individually shared from my (CentOS) server into a RAID array (ideally, RAID 5). At current, my drives are: ...
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46 views

Is it possible to restore lost files from a repartitioned raid 5 array?

I decided to reinstall my server from Windows Server 2008 R2 to Ubuntu Server 13.10. Of course, i took a backup of the (531GB) files on my software raid 5 array (4x3TB, no hotswap), however, some ...
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15 views

RAID 5 Goofy Partitions

My apologies if this is a stupid question. Hopefully the answer is stupid too. Brand new Windows Server 2012 with RAID 5. Everything is properly configured and installed, running great... I think. ...
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3answers
780 views

In a RAID 5 disk array, does recovering a drive increase chance of another drive failing?

If you have a basic RAID 5 array of 3 or more hard drives, and one fails, does this increase the chance of one of the other drives failing and making the full recovery impossible? If every one of the ...
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200 views

Is Btrfs vulnerable to RAID write hole effect?

If not, does it mean that Btrfs in RAID mode is fully resistant to power failure?
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348 views

Secure a server - Raid-5 encrypted with BitLocker? [closed]

I look after a small office, and when I say small I mean SMALL. The have a 2008R2 Windows Server running a domain and shares for about 10 people. They handle some pretty sensitive information so ...
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125 views

Raid5 reconstruction is extremely slow

Three days ago added another drive to my RAID5 array with 3 drives, each drive is 4TB. Since then than only 42% has been completed MegaCli64 -LDRecon ShowProg L0 -a0 ...
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85 views

Pegasus R6 - No Physical drive in the Enclosure

I have a Pegasus R6 (an external thunderbolt connected RAID array). I am trying reactivate 2 "dead" drives with the help of a shell and the command PromiseUtil. Phydrv -a list gives the message: No ...
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628 views

Assembling an mdadm array with “possibly out of date” disks

I've recently moved house and have had some power problems after switching on my file server that's using a mdadm RAID5 set up. The file system I'm using is ext4. It seems that at some point two (of ...
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1answer
46 views

Onboard RAID w/ Recovery

I am looking at purchasing the ASRock Z87 Extreme 6ac and I was unclear on if I should use onboard RAID or a dedicated card. My system will be well enough off that I won't have to worry too much on ...
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318 views

Restart degraded RAID array after crash

I've had to (temporary) reduce my RAID5-Array, so that there are four out of five disks available. Things getting worse as my system crashed during write process. After reboot the system wants to ...
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183 views

How to mount software RAID-5 created by Windows under Linux? [closed]

At our university we have a Windows FTP server that was implemented with software RAID-5 technology, but we decided to migrate to Linux. How can we mount and modify it under Linux?
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1answer
2k views

Bad superblock on /dev/md0

I have an mdadm RAID 5 array running on Debian Wheezy. It's comprised of 3x 2TB drives. I've obviously done something stupid, because now I can't mount it and it's throwing up the following error: ...
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19k views

How do I reactivate my MDADM RAID5 array?

I've just moved house which involved dismantling my server and re-connecting it. Since doing so, one of my MDADM RAID5 arrays is appearing as inactive: root@mserver:/tmp# cat /proc/mdstat ...
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2answers
69 views

How picky are RAID controllers when replacing a drive?

I had a drive fail in a RAID5 array and I'm working on finding a replacement. It's an older drive that's fairly hard to find, and most of them out there are used. How close of a drive do I need to the ...
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180 views

One unknown drive in previously operational RAID5 array

I have a RAID5 array on my computer, 3X 200GB sata drives. Everything has worked great forever but all of a sudden when I turn it on the BIOS shows that only two of the three drives are functioning. ...
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298 views

Is it possible to use grub2 with a linux root partition under Soft-RAID5?

I need some more space in my computer, therefore I want some basic changes be done. One of those is setting a RAID up for all files to be a bit more robust (I have just had a hd crash, so I am a bit ...
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2answers
1k views

mdadm: safest way to grow RAID 5 (4x2TB) with 2x4TB

My situation:I am currently running a RAID 5 with 4x2 TB disks and would like to grow the array with 2 x 4 TB disks. The goal would be that there is a RAID 5 with 4 x 4 TB (the two 4 TB disks and two ...
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4answers
834 views

Upgrading from poor performing RAID5 array

After much investigation and the purchase of PCMark7, I believe I have identified the root cause of my PC system's performance issues -- my RAID5 disk array. The PCMark7 scores are listed below. My ...
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1answer
400 views

Interesting Windows install issue with RAID and an SSD

I have been trying for days to solve this issue, so any help would be appreciated. Here is the issue: I have a Gigabyte GA-890FXA-UD5 motherboard. Here is a link to the manual and pages starting at ...
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333 views

Data Recovery from RAID5 disk - Promise Pegasus with Apple OSLion and Thunderbolt connection

I have a Promise Pegasus R6 - 12 TB RAID 5 disk for major storage purposes. One of the six 2TB hard disks were dead and the company provided me with a replacement. When the disk was inserted it ...
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1answer
2k views

Degraded RAID5 and no md superblock on one of remaining drive

This is actually on a QNAP TS-509 NAS. The RAID is basically a Linux RAID. The NAS was configured with RAID 5 with 5 drives (/md0 with /dev/sd[abcde]3). At some point, /dev/sde failed and drive was ...
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1answer
584 views

Find files affected by bad blocks with md-raid5 and LVM

I've been doing a lot of research on this topic over the last few weeks - and I think I'm close to completing my recovery, as much as is possible at least. To make a long story short, I'll just ...
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0answers
130 views

Disk utilization 100%, no read or write

Our disks on one of our servers are showing 100% utilization but no read or write. here is the output of iostat -xc 1 and errors on syslog https://gist.github.com/4110533 status info from raid card ...
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1answer
2k views

LaCie NAS failed - Recover Raid 5 From bad device

here is my problem: I have a 5disk (Seagate 2To) RAID5 working with a NAS LaCie 5big. Each disk is still working but the NAS device has failed and it refuses to boot with HDD inside (LaCie helpdesk ...
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3answers
9k views

Why is RAID5 disabled in windows 8?

I want to create a RAID 5 array in windows 8 with 5 Dynamic Hard Disks and it is grayed out. If this is not possible why not hide that option. If it is possible why it is disabled? after your ...
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8k views

How to force mdadm to stop RAID5 array?

I have /dev/md127 RAID5 array that consisted of four drives. I managed to hot remove them from the array and currently /dev/md127 does not have any drives: cat /proc/mdstat Personalities : [linear] ...
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373 views

RAID 5 array degraded - Intel Matrix Storage Manager suddenly says all 4 disks are “Non-raid disks”

Long story short, I have a linux (ubuntu 10.04 LTS) server with a 4 disks configured as a 2 TB RAID 5, set up with Intel Matrix Storage Manager v8.0.0.1038 in BIOS. My power went out, and the UPS ...
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2k views

Debian installation and RAID5

I just bought a HP Microserver for use it as dns, http, vpn, file storage and also for backups of other computers at home. I already have 2 1Tb HDD's, so I thought to buy another 2 HDD's and install ...
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2answers
1k views

FreeNAS RAID5 Server - CPU Choice

What factors should you consider when choosing a CPU for a FreeNAS server? What are the implications and limitations based on CPU in this context? Currently I'm looking to build a FreeNAS server ...
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150 views

Hardware RAID 1 With ERC/TLER/CCTL

I am aware of the problem when using standard consumer-grade drives with RAID levels 5 and 6; if a drive takes too long trying to read and/or repair a bad sector, it will be dropped by a hardware RAID ...
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2answers
2k views

Testing software RAID5 by pulling a HDD live. Bad idea?

I'm running Ubuntu Server 10.10, with software RAID5 and LVM running on top of that. I have four 2TB HDDs. I also have a separate boot drive with incremental full-system snapshots that run every four ...
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0answers
82 views

Intel Matrix Raid and Raid5

I suffered failed raid0 and now I'm buying 3x1TB drives to setup raid5 on Intel matrix storage manager that comes with my MoBo (Ausus 5pk-e). The questions is: how safe am I with the decision (raid5 ...
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1answer
4k views

How do I tell mdadm to start using a missing disk in my RAID5 array again?

I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine. When I had it all back ...