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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Fsck Errors on raid 5 Enclosure

We have a server (running ubuntu), with an eSATA attached 5 disk enclosure, running hardware RAID 5, that has (had?) an ext4 file system on it. So the enclosure uses RAID 5 to mux the 5 drives ...
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1answer
112 views

What is the Mean Time to Failure (MTTF) of a RAID5?

Given the MTTF T of an individual drive (say, 100000 hours) and the average time r it takes the operator to replace a failed drive and the array-controller to rebuild the array (say, 10 hours), how ...
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78 views

wrong # of devices in raid set after dmraid -ay ubuntu 10.04 server

After restarting my server i got (initramfs) prompt. Then i did dmraid -ay for activating raid devices. Then am getting errors as follows, wrong # of devices in raid set " device name" /dev/sda ...
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188 views

Recovering RAID5 array after zeroing wrong superblock

I have a raid5 array on 4 disks, sda1, sdb1, sdd1 and sde1. sdd1 was removed but is a healthy drive. While attempting to re-add it, I accidentally zeroed out the superblock for sdb1. sdb1's data is ...
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61 views

2 identical systems but different harddisk benchmarks results

I have 2 Dell pe2950 with a raid5 configuration. They are identical inconfiguration, however if I do a harddisk benchmark with ATTO Disk Benchmark I get very strange results. Both machines are of ...
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168 views

Get S.M.A.R.T. Info on Marvell Controller (RAID 5)

I have Windows 2003 R2 x64 and RAID5. Array controller is Vendor 11ABh Marvell Technology Group Ltd. Device 6485h MV64460/64461/64462 System Controller, Revision B Subsystem ...
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1answer
905 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
50 views

Preparing for RAID5 failure [closed]

I've got an Ubuntu system with a bunch of hard disks in it acting as my home router, DHCP server, file server, etc. Twice in the past 24 hours it has suddenly decided to set the root filesystem to ...
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3answers
70 views

Raid 5 scsi fault

I have no much knowledge about servers and I was looking all day around the internet about finding a solution to my raid 5 problem. All of a sudden two disks failed. The server won't boot (HP ...
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1answer
225 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
141 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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2k views

What Block Sizes and Stripe Sizes will cause performance issues using RAID5?

I'm trying to understand Block Size and Stripe Size. I realize this could apply to more configurations than just RAID5, but i am interested in RAID5 specifically, because I'd like to understand the ...
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1answer
47 views

replace a healthy drive in Raid5 on NAS

Good day! I have a 4 disk Iomega NAS. The config is: 4x2TB RAID5, 4.4 allocated, 2.3TB used, and i kept 1TB as available, but not allocated. Nothing has failed, but while 3 disks are 7200 rpm and ...
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50 views

3ware Raid Driver for Redhat

I am trying to install RedHat 5.6 64 bit on SuperMicro Server. And I created Raid5. But when I started the OS installation . Redhat prompted me to select the Driver for Raid which i downloaded. But it ...
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1answer
275 views

Grub2 w/ RAID5 and btrfs “error: unknown filesystem”

I have a Virtual Machine (in ESXi 5.1) running Ubuntu Server 12.04. When I try to boot my system I grub2 tells me "error: unknown filesystem". I've tried booting a Live CD then reinstalling grub from ...
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1answer
950 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
77 views

RAID5 Bad Superblock, not booting to OS

I've been running Ubuntu 12.04 LTS for about 6 months on a computer that has 3 180gb SSDs in EXT4 RAID5 configured through the motherboard's BIOS. The OS froze and computer had to be forced down. On ...
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1k views

What are the main points to avoid RAID5 with SSD?

My understanding is that an SSD has a limited amount of writes. RAID5 performs many writes due to parity information across the drives. So reasoning states that RAID5 would kill and lower the ...
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1answer
187 views

Will configuring a server with RAID 5 and (2*500gb) + (2*1TB) work?

I'm currently setting up a DELL server, which came with 2*500gb disk drives but is configured in RAID 1. I want to increase the total capacity of the disk storage to at least 1TB. Now with it being ...
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2answers
404 views

Are ext4 RAID5 tuning options useful under LVM?

I'm setting up a system with a system with a mdadm RAID5 which is the sole PV for a VG which hosts 4 LVs. When I make the filesystem, would the mkfs.ext4 -E option be useful? Or is its effect not ...
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1answer
51 views

Age of hard drive via software tool on Windows 7

I an running Intel Raid 5 on Windows 7, and one of my hard drives is reporting an error. This is the second time I've had a hard drive error, and last time I replaced the problem drive. Now I've had ...
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1answer
93 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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3answers
708 views

Convert RAID 5 to RAID 10 without data loss

I have a Windows SBS 2011 server on a Dell R610 with RAID 5 configuration [3 disk]. Is there a way to convert it to RAID 10[4 or 6 disk] without losing anything or needing to re-install the whole OS ...
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3answers
277 views

Raid 0, Raid 1, Raid 5, Raid6, Raid 10 Read/Write performance? [duplicate]

Assume a single disk has a baseline of 1W & 1R performance, how does the different RAID configurations behave? My initial guess: Raid 0: 2W 2R Raid 1: 1W 2R Raid 5: ? ? Raid 6: ? ? Raid 10: ...
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1answer
142 views

Can I recover data from a RAID5 after accidental changed of disk order? [closed]

An intern yesterday accidentally changed the disk order, now we get there error, "Following containers have missing required members and cannot be configured. Container #0 RAID-5" Then no boot device ...
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1answer
99 views

Setup 1x RAID5 array with multiple LVs and differnt filesystems?

Centos 5.9 - 2.6.18-348.3.1.el5 i686 Raid5 - 4 Disks + 1 Spare (all WD RED 3TB) Does it make sence to create multiple LV within the same VP and configure them as differnt filesystems: Example: LV1: ...
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2answers
387 views

Proliant Server E200i Raid Controller does not see array

Help! My server was configured with 3 arrays: array 1 and 2 were each 136Gb raid 5 using the first 5 drives. 3 x 72Gb and 2 x 300Gb. Array 3 was 3 x 500Gb using drives 6 7 8 for 1Tb. I had a ...
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1answer
406 views

RAID: replacing a disk before it fails

We have a RAID 5 setup (Megaraid SAS ROMB) with 4 930 Gb physical disks running as a 2.7 TB VD. Recently (a few months back) we had a drive fail and had to leave it in degraded mode for ages (various ...
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3answers
156 views

Migration of HDDs in RAID 5 from a P410 Controller (Urgent)

I'm kind of totally lost right now. I have a server with a P410 Controller (256 Mb) and 4 Drives in RAID5. The server don't start :/ I need to find a solution in emergency, but don't know wich one ? ...
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1answer
205 views

Missing 2 Disk out of software RAID 5

I have a Debian squeeze installation with 6x 3TB Disks. On the SW RAID5 are 4 partitions. First for gpart BIOS, RAID 1 for "/", RAID5 for swap and the biggest part RAID5 for files. While the ...
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161 views

Can I remove and test hard drive from Raid5 controller without rebuilding?

I have a new PowerEdge T320: 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 Raid5 I have ...
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2answers
741 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
151 views

How to resize Windows partition after conversion from RAID 1 to RAID 5?

I'm using Fujitsu PRIMERGY RX200 S6 with RAID controller RAID Ctrl SAS 6G 5/6 512MB (D2616) I've migrated RAID 1 (2 discs) to RAID 5 (4 discs) without any problems and on the fly without restarting ...
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1answer
95 views

how to Recovery RAID 5 storage that deleted array by console [closed]

I have A IBM DS3400 Storage this storage deleted array by console command. My Question is how to Recover data From this storage. thank all.
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1answer
199 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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164 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
153 views

Building recovery plan for HP DL380 G7 server [duplicate]

Possible Duplicate: Disaster recovery plan development best practicies or resources? I need your help to find out best practice to maintain my server and be ready for any kind of disk error ...
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70 views

Is it possible to perform a clean install without losing software RAID 5 data?

I have a machine running Ubuntu 12.10. It has 3 1TB drives running software RAID 5 (each drive has a main,and swap partition. 3x main partitions are raided and mounted as /, 3x swap partitions are ...
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1answer
321 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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1answer
368 views

RAID-5 or RAID-6 - is RAID-5 really that bad? [duplicate]

Possible Duplicate: Which is better: RAID5 + 1 Hotspare / RAID6? I need to decide myself between RAID5 and RAID6. The servers have a hardware-RAID controller and 6 drives each. The ...
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1answer
61 views

Arch Linux on Software RAID, can't find VolGroupArray

I am trying to install Arch Linux on a Software RAID that I am building following their instructions on the Wiki. I built as far as the Logical Volumes and after that switched to the Installation ...
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1answer
195 views

Dell Perc 6i raid5 array: replace drives and expand VD?

I have a Dell T300 with a Perc 6i, to which 3 500Gb drives are connected. The are assembled into a raid 5 ~1000Gb VD. This setup is working fine, however system is filling up and I would like to ...
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1answer
106 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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3answers
6k views

How to replace failed drive in RAID 5 array in HP DL380 G4 server

Sorry for not providing more information when I previously posted this question. More detail is provided below. Any feedback would be welcome. I have a HP DL380 G4 2U server which has 6 drive scsi ...
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1answer
972 views

2 Disks lost from RAID5 on P212! How can I recover the array without losing data? [duplicate]

Possible Duplicate: All servers flooded by salt water, is it possible to recover data from multi-platter drives? I am an individual user of HP P212/Zero Memory Smart Array Controller and I ...
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2answers
367 views

Windows Server 2008 Software Raid 5 - Data integrity issues

I've got a server running Windows Server 2008 R2, with a (windows native) software raid-5 array. The array consists of 7x 1TB Western Digital RE3 and RE4 drives. I have offline backups of this array. ...
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2answers
623 views

Proxmox and PXE boot

I have 10 rack servers, each has an 80 GB hard drive, and a Dell PowerVault with no hard drives. It is possible to take all these hard drives and put them in the PowerVault cluster, then boot proxmox ...
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78 views

Single drive LVM to RAID6 LVM

I cloned my entire LVM volume group from a single drive to a RAID5 array with 3 disks. The VG is formed by these logical volumes: root swap home ... and other volumes of some XEN virtual machines. ...
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1answer
112 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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2answers
657 views

Terminal Server disk performance

Our users experience slow session performance at times during normal work hours. Applications (IE, Office Apps etc.) are slow to respond so is switching between them. This problem happens sporadically ...