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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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 ...
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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 ...
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1answer
255 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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368 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 ...
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1answer
179 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 ...
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1answer
94 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 ...
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1answer
617 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 ...
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1answer
230 views

how do i fix progressively slower write speed in a raid 5?

We have a RHEL5 install on a machine with 5 Seagate 1 TB SAS disks. One has the OS and swap on it. The other four are in a hardware Raid 5 (mounted as /home) managed by a DELL Perc 6/i controller. ...
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0answers
99 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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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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85 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 ...
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195 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 ...
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1answer
841 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 ...
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4answers
620 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 ...
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2answers
224 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 ...
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4answers
2k views

Linux Software RAID 5 Random Small Write Performance Abysmal - Reconfiguration Advice

I have 3 1 TB HDDs and 3 500 GB HDDs. Right now each size grouping is in a RAID 5, both of which are in an LVM volume group (with striped LVs). I'm finding this to be too slow for my usage on small ...
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5answers
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Disk failed part way through 3ware RAID 5 rebuild

I have a 3ware 9650SE RAID controller with a RAID 5 array containing 15 Seagate ST31000340NS disks. After noticing ECC errors in the Port 10 drive I replaced it with a spare and began a RAID rebuild. ...
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2answers
126 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 ...
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4answers
1k 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 ...
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1answer
290 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 ...
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1answer
316 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
366 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 ...
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2answers
1k 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 ...
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1answer
119 views

Reshape linux md raid5 that is already being reshaped?

I just converted my RAID1 array to a RAID5 array and added a third disk to it. I'd like to add a fourth disk without waiting fourteen hours for the first reshape to complete. I just did this: mdadm ...
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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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2answers
1k 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 ...
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2answers
139 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 ...
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2answers
883 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 ...
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1answer
72 views

Upgrade no raid server to raid

I have just learned that our PDC has a single drive with 2 partitions. I also know that this drive has bad blocks as recorded in the event log. What I would like to do is to convert this to a RAID ...
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1answer
532 views

3ware card in RAID-5 configuration slow and causes load when writing

I have a 1Gb/s bandwidth between my computers. The source can actually read and send data at 25MB/s via SSH. My test file is 4GB, I use scp without compression for the test transfer. The rate is ...
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1answer
230 views

Linux mdadm RAID5 data recovery with one drive failed, one drive failing

Improbably I had two drives fail in the same Raid5 array within 2 weeks of one another. Which means the array is dead. Yes yes hot spares not being lazy about replacing the failed drive I know. But ...
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1answer
127 views

Migrate Windows Dynamic disk RAID5 to Linux LVM

Is this even possible, do I have the right tool in mind? I have 3 disks that are running as a software RAID5 using windows. I would like to migrate box to Linux without experiencing data loss. Am I ...
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1answer
224 views

Raid 5 recovery

Attempting to recover a 5 Disk Raid wherein 2 of the 5 disks are out of sync. Is it safe to create the raid from 4 of the disks? mdadm --examine /dev/sd*1 > /raid.status grep Role raid.status ...
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1answer
160 views

How can I upgrade the disks in my RAID 5 array on our primary server?

Our domain server/file server has a RAID 5 setup with (3) 450 GB drives configured as 900 GB disk, which is broken into two logical partitions a 25 GB boot partition and an 875 GB storage partition. ...
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1answer
500 views

Can I resize a software RAID-5 in Windows Server 2k8 R2 Enterprise?

I want to add a fourth disk to my software storage RAID in server 2k8 R2. I'm not seeing any way to do this with the built in disk manager, Paragon Partition Manager, or EASEUS Partition Manager. Is ...
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2answers
764 views

Debian Raid5 LVM

I want to setup a debian server mainly used as data storage. I have 4 devices: /dev/sda (160GB) - installed debian on it /dev/sdb, /dev/sdc, /dev/sdd (all 500GB) - created a raid5 array with it ...
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2answers
277 views

Moving Raid 5 ISA controller card + 4 Drives to another server while keeping data (not boot)

Due to server failure i would like to move a scsi ISA raid controler + 4 hard drives to another pc to recover the data inside them(raid 5). This raid isn´t a boot raid, there´s another raid holding ...
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1answer
233 views

Expanded 8TB RAID5 in mdadm only showing 3.5TB available

I had 3, 2TB disks in a RAID5 that I expanded to a 5, 2TB RAID5 (details here). This all went fine but when I went to the folder I have array mounted to (/var/media), it only show 3.5TB of space ...
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1answer
2k views

What is the procedure for reactivating a failed mdadm RAID5 array?

I have a three disk RAID5 array managed with mdadm, with an XFS filesystem on it. While I was using the machine, I noticed the machine suddenly become unresponsive (new programs wouldn't start, etc), ...
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3answers
1k views

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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2answers
184 views

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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1answer
43 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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1answer
764 views

Qnap TS-410 deleted folder by accident anyway to recover data (raid 5 / ext4)?

I am not in a very good situation at the moment, and bit stressed! I have a Qnap nas (TS-410), this operates on a Marvell 6281 800MHz CPU, while I SSH'ed into the Nas box, I deleted the wrong folder ...
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1answer
228 views

Recoving from a software RAID 5 disk failure

I'm putting together a cheap NAS box and I've read some articles about raid5 not being as robust as I'd imagined. I wanted to get some answers to the following questions before I proceed. I'm ...
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1answer
2k views

Linux RAID5 Optimal Chunk Size

I bring up, yet again, the ever-present question of how to best optimize disk structures. In my organization, we have a 14TB Linux software RAID array dedicated to storing backups made using Symantec ...
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1answer
2k views

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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1answer
396 views

Failing disks in RAID array - strategy suggestions required

I have a linux based software RAID 5 array. SMART has just started to send me emails complaining that one of the 5 disks has a Current Pending Sector Count of 9 and also an Offline Uncorrectable Count ...
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2answers
557 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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3answers
168 views

Is this a possible/good RAID setup?

Earlier this week, one drive in our office's 2-year-old RAID5 array (4x 750GB Seagate drives, HP ProLiant 110 with Smart Array controller, running Windows Server 2003) failed. From what I know, RAID5 ...
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4answers
305 views

Ubuntu Server: Partitioning large hardware raids

I am trying to set up a storage server which has a hardware raid controller and 15x3 TB harddrives. This server is a dedicated server from hetzner.de and I am using the default setup routine ...