Tagged Questions

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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5answers
2k views

How should I sanitize a SAS drive that I removed from a RAID 5 Array?

I had a disk experience a predictive failure. As a result, I removed the drive and replaced it. Now that I have the drive removed, I would like to sanitize it. What is the easiest way to go about ...
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2answers
213 views

shell script to get raid controler details

How can I get the RAID 5 controller array details using a shell script command?
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4answers
995 views

Running swap on RAID10 or RAID5?

In follow-up to this previous question (and it's excellent answer), I am curious to know if running swap on a RAID5 might not be better than on a RAID10. My thinking is that you might lose a bit on ...
0
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1answer
236 views

Create superblock for software raid-5 array

I have created a raid 5 array with mdadm. I created partitions on all five of the disks created a raid-5 array with mdadm on these five partitions). Everything seems fine however when i try to mount ...
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2answers
867 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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3answers
857 views

Problem with RAID5 (mdadm) - disk detached

Having these lines in /var/log/syslog Apr 18 16:53:05 Server kernel: [4487878.816036] ata4: EH in SWNCQ mode,QC:qc_active 0x1 sactive 0x1 Apr 18 16:53:05 Server kernel: [4487878.816058] ata4: ...
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1answer
132 views

Can I replace a failed RAID disk with a used spare?

I have a Dell PowerEdge 2650 with hardware Raid - two drives in Raid 1, four drives in Raid 5. Originally, all six drives were the same size, but a while back I upgraded the Raid 5 array and kept the ...
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3answers
560 views

SATA I on 4x 2tb RAID5 array does it matter its 1.5gbs SATA I not 3.0gbs SATA II

Just installed 4 2tb Hitachi 5K3000 drives into a IBM x3500 7977 server. It's got a adaptec 8k serveraid card. Turns out it doesn't detect the drives as Sata II 3.0gbs. It only see's them as Sata I ...
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2answers
350 views

Sources of bottleneck for Linux RAID5 software array

I created a 7-drive RAID5 array with mdadm and put LVM2 on the array should I want to expand it in the future. I formatted as XFS. I basically followed this tutorial line for line: Easy to expand ...
0
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1answer
1k views

mdadm on ubuntu 10.04 - raid5 of 4 disks, one disk missing after reboot

I'm having a problem with the raid array in a server (Ubuntu 10.04). I've got a raid5 array of 4 disks - sd[cdef], created like this: # partition disks parted /dev/sdc mklabel gpt parted /dev/sdc ...
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1answer
1k views

Recover data from PERC 6/i RAID5 array using software RAID

I have 4 hard drives from a RAID5 array from a Dell server that suffered physical damage to the PERC 6/i RAID controller card. The 4 disks themselves are undamaged and I've created 4 disk images ...
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2answers
6k 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
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1answer
2k views

Why does MDADM Raid 5 require a spare

From the mdadm man page: "When creating a RAID5 array, mdadm will automatically create a degraded array with an extra spare drive. This is because building the spare into a degraded array is in ...
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3answers
260 views

What happen when you replace a broken harddrive with a bigger one into RAID5

Given I have a raid 5 of /dev/sda, dev/sdb, /dev/sdc, now with the same size (said 250G) But later, /dev/sda failed, so I replaced it with /dev/sdd of 500G. What happens? If Later I replace /dev/sdb ...
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2answers
712 views

Rosewill RSV-S5 and it's transferespeeds

I have just bought a Rosewill RSV-S5, I have installed 5x1,5Tb Western Digital Green disks in it. After that have I created a Raid5 on them all with the software that followed with the hardware. Not ...
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2answers
125 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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3answers
2k views

How do I stop and repair a RAID 5 array that has failed and has I/O pending?

The short version: I have a failed RAID 5 array which has a bunch of processes hung waiting on I/O operations on it; how can I recover from this? The long version: Yesterday I noticed Samba access ...
0
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2answers
142 views

Data integrity after RAID5 crash

After a hard drive died on a RAID5 setup on a legacy system, the Vmware Virtual Machine on it kept on running for a period of 6 months. Needless to say, finally it crashed bad. Now, the dead hard ...
2
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5answers
8k views

Replacing a dead hard drive in RAID 5 with a different type

One of the drives failed in my server configured with RAID 5, and I can't find a exact replacement. From my understanding, RAID 5 supports drives with different sizes. Is this safe? Any ...
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4answers
1k views

Can I use 2x 1TB 64MB Cache and 1x 1TB 32MB Cache in a RAID 5 setup?

I've been told the drives have to be identical for RAID 1, but when searching for additional drives in local stores to match: WD 1TB Caviar Black 7200rpm SATAII w/ 32MB Cache They say they don't ...
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2answers
3k views

RAID 5 setup not being noticed with Windows Server 2008 R2

I have just received a new DELL PowerEdge R310 Server and according to my job I need to set up all 4 500GB drives to run using the RAID 5 configuration. When I go into the controller configuration ...
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5answers
1k views

Detecting raid setup in centos 5

We have bougth a server off of Iweb web hosting and its supposed to have raid5 hardware installed. At this point so many things have gone wrong with IWeb we are just not sure we have our raid at all. ...
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1answer
1k views

Understanding blinking LED of Hard disk SATA configured in Raid 5

on a HP Proliant ML 350 G4p are installed and configured 4 hard disk SATA in RAID 5 mode. Two of the four hard disk have green LED blinking irregullary, one off and another green LED ON without ...
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2answers
758 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
499 views

Proliant ML350 G3 System board failure

My ProLiant ML350 G3 Tower server's system board has gone bad after it had an inch of its lower edge in rain water. I have a SCSI controller Smart Array 532 with six (36GBx3 and 146GBx3) under RAID5 ...
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votes
4answers
458 views

mdadm: Replacing array with entirely new drives

I have a server with three 500GB drives, with most of my data in a RAID5 configuration spanning the three of them. I just purchased and installed four 1TB drives, and the intention is to move off of ...
0
votes
2answers
497 views

How to identify RAID (5 or 6) controllers that allow dynamic resize of the array

I'm building a server with a RAID5 array, based on a hardware controller. I want to be able to later add additional disks and have the array rebalance across all of the disks, enlarging the usable ...
6
votes
3answers
25k views

RAID 10 or RAID 5 for multiple VMs - what is the best choice?

I have just ordered a new rig for my business. We do a lot of software development for Microsoft SharePoint and need the rig to run several virtual machines for development and test purposes. We will ...
1
vote
3answers
630 views

RAID 5 heavy IO hard freezes Ubuntu: Why?

I have a software RAID 5 partition on LVM in Ubuntu (desktop, actually, but I'm using it as a server). I have been rsyncing a ton of data to it, and the computer was hard freezing, as in I needed to ...
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vote
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 ...
0
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2answers
126 views

/home partition stuck

I have development box with apache and userdir mod enabled. Sometimes, entire /home partition becomes inaccessible. Apache can't access scripts stored there, and I cant cd to /home nor ls its ...
2
votes
1answer
161 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 ...
1
vote
1answer
202 views

moving mdraid from failed Buffalo NAS

I've been tasked with restoring a RAID from a failed Buffalo NAS. the NAS box has failed, but our understanding at this point is that the drives are still functioning. I believe that Buffalo's NAS was ...
1
vote
1answer
4k views

How do I replace a disk marked as removed from a linux md raid-5 array?

I had some recent computer issues and somehow one of my disks ended up not being recognized in my array anymore. It identifies fine, and both smart and some other disk checking utils all say its fine, ...
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2answers
1k views

Software RAID 5 with different sized hard drives

Is it possible to use Linux software raid with different sized hard drives? What will happen? Related
0
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2answers
911 views

How to recovery a 5TB raid 5

We have a 5TB raid 5 virtual disk cluster... I think the MBR got messed up and windows server 2003 no longer is able to view the contents of the virtual disk... All the disk recovery software I have ...
4
votes
3answers
1k views

Which RAID level (5 or 0+1) should I use with 3 disks and why?

This is specifically for backup storage but, for informational purposes, I would like to know why would you chose one over the other? Five minutes ago, I was not even aware that RAID 0+1 was an ...
0
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1answer
218 views

Raid5 Write cache - Nvidia motherboard

I can't figure out where to enable write-cache for nvida's raid. When using an intel motherboard with ICH10, there is a setting in the raid-software that enables write cache. I can't find that setting ...
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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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2answers
276 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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3answers
4k views

RAID 5 with big SATA disks. Do or don't?

Is it sane to build a machine with RAID 5 expecting to hold around 5 Tb (and able to grow) with 1.5 or 2 Tb SATA II disks? It will be used as audio and documents storage. I already have chosen a ...
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vote
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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votes
4answers
389 views

Which RAID format is best for data privacy during RMA?

So there are several RAID configurations to chose from, and I was wondering, eventually I expect some 25-45% of my drives may need to get swapped for a warranty repair. I know that there is no hope ...
3
votes
1answer
868 views

Growing a RAID5 using mdadm with multiple drives?

I have a RAID5 array that consists of 3, 2TB drives. I want to add 2 more drives. The tutorials involve adding a single drive to an array, such as this: https://raid.wiki.kernel.org/index.php/Growing ...
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4answers
17k 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 ...
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vote
1answer
1k views

How to make partition, raid5 and filesystem on 6x2TB WDC-drives in Linux

I'm getting confused by this "Advanced Format" (4KB sectors) talk of bigger (2TB) drives - and I am wondering about how I would resolve this if I'm building a new software (mdadm) RAID-5 array. The ...
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3answers
3k 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 ...
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2answers
2k views

Intel Rapid Storage Technology - Raid5 is very slow

I build a computer with a raid5, using the motherboards raid controller (ASUS P7H57D-V EVO - intel Rapid Storage Technology). The read and write are however very slow, when using the raid controller ...
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 ...
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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), ...