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

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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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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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17 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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18 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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42 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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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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92 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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103 views

Does Btrfs prone to RAID write hole effect?

Does Btrfs prone 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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100 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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34 views

RAID and rebulding

I have the following setup: Raid 5: 1 TB Drive 2 TB Drive 2 TB Drive 3 TB Drive Which give me a total of 3TB. I just set this up tonight and I was testing to see what happens when I ...
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79 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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53 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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270 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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39 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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208 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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155 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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604 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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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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57 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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123 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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223 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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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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508 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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275 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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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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1k 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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418 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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93 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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1k 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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6k 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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5k 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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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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1k 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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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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123 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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1k 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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80 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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2k 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 ...
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416 views

A weird issue relate to ext4/lvm/raid-5 after partition recovery

I have 3 hard disks, in the following paragraphs named /dev/sda, /dev/sdb and /dev/sdc, newest came first. Note: /dev/sdc has one primary partition /dev/sdc1, one extended partition /dev/sd2, and 3 ...
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73 views

GRUB only sees first of 2 identically-configured drives in RAID 5 array?

Has anyone ever come across a case where of the two (virtual) disks that are members of the same hardware RAID 5 array (LSI 9750), GRUB can only see the first? It's a 100% hardware RAID 5, to the ...
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703 views

Safety of Truecrypt for Large Raid5 using ubuntu, mdadm, lvm, ext3?

I'm planning to set up a large (probably 6-9Tb) raid-5 array on ubuntu using mdadm, lvm and ext3. Does anyone have any opinions or suggestions on the safety of using a Truecrypt volume for that amount ...
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269 views

RAID5 + Samba Woes

I'm in the process of setting up a brand-new CentOS 6.2 server. The boot, swap and root partitions live on a 320GB SSD, and my archive files are on a 9,000 GB RAID array. Problem is that if I setup ...
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601 views

Adding Space to RAID5 using mdadm, lvm and ext3

I have seen a few descriptions about using mdadm with lvm to create an easily expandable raid, such as this question, but I still think I'm missing something. Say that I create the raid using mdadm ...
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1k views

Will this RAID5 setup work (3TB Seagate Barracudas + Adaptec RAID 6405)?

As the title states, will this RAID combo work, and if not what needs to be changed? Overall opinions would be most helpful. I currently run a small file server of about 5TB or so. I keep outgrowing ...
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183 views

How to expand Raid 5 on ICH10 - Gigabyte ex58-ds4?

I was wondering if there is a relatively simple way to expand my HD space. My setup is 4 x 640 GB drives. Motherboard has 4 ports on 1 controller and 2 ports on another controller, however they can't ...
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1k views

Filesystem corruption (?) and appropriate use of fsck

Last week at work, our linux server (CentOS 5.5) was unresponsive to log in attempts, so I had to hard shut down it. After pulling out a couple of disks, on boot up it reported a degraded raid array ...
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147 views

ReclaimMe Recovery of the Table used to identify member disk in RAID 5 array

I have seen this issue posted on many forums with only one possible solution (suggested below) and before I attempt I thought the community could weigh in on this solution and then we can share it ...
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1answer
269 views

Restoring Raid 5 Meta data / Table

2 part question at end of this text My problem: My CMOS was cleared, BIOS was set to IDE instead of RAID. My understanding (from other sites) is that motherboard Intel ICH10R data is stored in BIOS ...
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375 views

RAID 5 Recovery Reset CMOS and drives show up as 2 Member 4 non-Member

How do you restore a raid array (not part of your C drive) after resetting BIOS and installing a new C (Windows) drive. My setup: (its a LOT of data, i cannot afford to lose it, most of it is ...
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334 views

Disk durability when using RAID 10 vs RAID 5

Most of the time technical articles about different RAID levels mostly about how redundant they are, how fast on read/write etc. But I can't find information about would a disk in a certain RAID live ...