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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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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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 ...
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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 ...
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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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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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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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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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996 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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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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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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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 ...
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469 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 ...
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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 ...
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618 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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1answer
70 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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125 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 ...
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160 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 ...
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183 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 ...
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3k 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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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
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866 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 ...
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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 ...
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216 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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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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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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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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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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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 ...
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801 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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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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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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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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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 ...
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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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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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Rebuilding RAID 5 in HP Proliant ML 370 G5 Server

One of our customer having HP Proliant ML370 G5 server with Windows 2003 SBS.That having 2*72GB(Single Port10K Serial SCSI) and 3*146GB(Dual port10K SAS) harddisks.Now that is going to full.I want to ...
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Software MDADM RAID 5 - Inactive MD0 showing

I have Linux (Crunchbang 8.10) set up with 3x1TB Hard drives set up as software RAID5. It has recently suddenly stopped working. cat /proc/mdstat shows the following: Personalities : [linear] ...
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957 views

Does windows support hard drives larger than 2tb?

I have 6 x 500Gb drives formatted in raid 5. I have installed Windows Server 2003 R2 on 20Gb of this and want to format the rest as a backup drive (2.2Tb) is this possible? I have found the following ...
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How to recover from RAID 5

there are 5 disk-array. i've lost the data of one of them. How can i recover? I don't know where to start?
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How to recover from RAID 5 [duplicate]

Possible Duplicate: How to recover from RAID 5 there are 5 disk-array. i've lost the data of one of them. How can i recover?
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Is it safe to shutdown a machine while rebuilding/recovering/growing a RAID5 array that was built with mdadm

I have recently started a recovery on my 5-drive RAID in my file-server, and it says it'll take 691+ minutes to complete. I was wondering what would happen to the process if the machine lost power - ...
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495 views

How long should the initial creation of my RAID 5 Array take? This seems ridiculous

I'm building a raid 5 array with 3 1.5TB drives on CentOS 5.5 using mdadm. Everything seems to be working fine, except it's taking forever and I'm not sure if that's normal. It's going on 6 hours ...
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MDADM RAID 5 data recovery

Thanks for reading this thread and I thank you in advance for any help you can provide. So this is what happened... I noticed that my MDADM RAID 5 array with drives ordered: /dev/sd[EFGHIABCDKJ]1 ...
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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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Moving a RAID-5 array from a dead HP ML350 G5 to an HP DL380

We have an HP ML350 G5 with a 3x72GB RAID5 array that we were in the process of decommissioning. After shutting down the server and moving it, but prior to moving the data elsewhere, the server ...
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understanding RAID Level 5

Just wanted to clear my understanding on RAID 5, suppose we have 100 GB of data to be stored in SAN in RAID level 5, does the actual storage means 100 *5= 500 GB ?, or it is the 100 GB only which is ...
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242 views

Multiple RAID arrays in x346

I have an x346 server with 3 x RAID 5 73GB U320 HDD's running ESXi with 2 VM's on it. 1 VM is an exchange server running IIS and SQL2008. The other is an applications VM running IIS. I have another ...
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Can I boot from a software RAID5 setup with linux?

I am planning the setup of a new NAS system, deciding if using Openfiler or something similar. I've been checking some RAID cards, and thinking about hardware failure or substitution, and I have the ...
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How do I calculate the disk subsystem i/o capacity

I am trying to figure out the number of 8K page i/o capacity for a disk subsystem. The drives are SATA 7200 RPM - 4 drives in a RAID-5 configuration. I am not sure about the SCSI controller but the ...
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242 views

Older raid controllers in raid 5 vs. Jbod and SW raid

I'm in the fortunate position to have 6 Supermicro older VOD servers with the following config: Supermicro 3U case, 3xPSU Dual Xeon 3ghz P4 class cpu (5 years old.. havnt checked the exact type) 4GB ...