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

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Can Intel RST in RAID5 configuration be used for Windows boot drive?

I'm planning to build a new computer, motherboard will be based on X99 chipset. I'd like to set up 4 SSDs in RAID5 configuration, and use that volume for Windows boot. Is it possible now? Can I ...
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2answers
98 views

Raid mode 5+ has collapsed on my Mediasonic HFR2-ASU3S2, how to get data back?

I have this: Mediasonic HFR2-ASU3S2 I set it up with 4x 4tb drives that were meant for NAS, all WD drives. Now when I plug in the Mediasonic HFR2-ASU3S2 I get a warning pop up asking me if I want to ...
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41 views

Repair btrfs RAID? Error: Inappropriate ioctl for device

I have a RAID5 btrfs with 8 disks and a hard disk died and just disappeared from the list. Now I tried removing it but got an error: ERROR: error removing the device '/dev/sdb' - Inappropriate ioctl ...
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24 views

No extents were found for the plex, when setting up Soft RAID 1 with RAID 5 on Windows Server 2012

I did find a similar question on this, but it did not really answer my question or fix the problem, so i'm starting up a new questions on it. This is my setup now: You can see if i have RAID 5 ...
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72 views

QNAP TS 410, is it rebuilding RAID?

The QNAP TS-410 had a failed disk the other day and went into degrade mode. So I bought a new disk. Former disks were Seagate, but I bought a Western Digital now which it approved by QNAP in its ...
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39 views

How to make a cheap and speedy raid 5 drive without case

I'd like to turn my old 4 to 5 80gb sata hdds into a raid 5 drive. 4 to 5 bay NAS cases can be about $300. But I should not need one. What would it take to essentially build one of those $500 5 bay ...
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40 views

I can't access my LVM partition after RAID recovery

I need help after an accident with my RAID 5. I recreated it with: mdadm --verbose --create /dev/md2 --level=5 --chunk=64 --raid-devices=4 /dev/sdb4 /dev/sda4 /dev/sdd4 missing My array seems to ...
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1answer
47 views

Recovering data on 20TB RAID 5 NAS, overwritten by 500gb RAID 1

I have a Linux gateway with 2 500gb drives in software RAID 1 for system. /dev/sda = RAID 1 /dev/sdb = RAID 1 /dev/sdc = RAID 5 (NAS 12 drives iSCSI, /home directories) While replacing sdb, weird ...
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29 views

Degraded RAID 5 array, can't add replacement drive

So I've had two drives that have been marked as faulty spares in my RAID, I've removed them then I tried to --force assemble the RAID but this came up - mdadm: /dev/md0 assembled from 2 drives and 1 ...
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97 views

ZFS (RAID-Z1) or “hardware” (RAID 5) on Linux system?

I have never put together a RAID array before, but i think i understand the concepts behind most raid types from my reading. Ordering three 3TB drives (WD red) to use in a xeon e3-1231 v3, 16GB ...
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1answer
13 views

re-assemble out-of-date raid5?

I need help with my raid5 after it crashed through bad sectors. Previously I could re-assemble it with # mdadm --assemble --force -v /dev/md0 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdh1 /dev/sdi1 but ...
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107 views

RAID to handle 800 random blocks per second

This is a homework. We are supposed to pick HDD, imagine we are buidling RAID to handle 800 random blocks per second (550 reads/250 writes). I have picked RAID5 made out of 3 HDDs. But it is too ...
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1answer
25 views

How to configure RAID 5 with different size drives?

If I have 3 different drives, for example 10GB, 20GB and 30GB. I would like to configure RAID 5. What would be the size of data disk and parity disk in the array?
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49 views

RAID5 active device failed during reconstruction

I have this Linux RAID5 array with 4 2TB harddisks, with 3 active device and one spare, giving me a total disk size of around 6TB. Recently one drive (sdd) is starting to give me some SMART errors, ...
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98 views

Ubuntu LTS 14.04.01 Software Raid 5 Installation from scratch

I failed installing ubuntu 14.04. lts with software raid 5 and four sata disks. In the end it is not able to install grub2. I am running a hp proliant ml 150 server. It has got old style bios. Ubuntu ...
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1answer
18 views

Trucrypt volume on Raid5

I have a NAS with the system disk on SSD and 8 HDD's in a RAID5 configuration (using an IBM5015 card). The RAID5 volume is encrypted using truecrypt. What happens if the computer dies ? My raid card ...
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37 views

Windows not loading after 1 RAID-5 disk failed

I left my PC turned off for just over a week while I was away. When I turned it back on it said my RAID-5 status was degraded and Windows did not want to load. I replaced the faulty disk and set it ...
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1answer
251 views

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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1answer
36 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
390 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
206 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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64 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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89 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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192 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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159 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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1answer
52 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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212 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
38 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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1answer
10k 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
2k 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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88 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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1answer
130 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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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
2k 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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344 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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573 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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185 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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127 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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1answer
1k 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
52 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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1answer
413 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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213 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
3k 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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37k 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
88 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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2answers
235 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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1answer
390 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
1k 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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495 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 ...