Questions tagged [raid5]

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 redundancy and performance (via parallel communication) is required. RAID 5 is a specific implementation.

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Recover RAID 5 data after created new array instead of re-using

Folks please help - I am a newb with a major headache at hand (perfect storm situation). I have a 3 1tb hdd on my ubuntu 11.04 configured as software raid 5. The data had been copied weekly onto ...
Brigadieren's user avatar
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2 answers
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Failed Redundancy for RAID 5 Disks

I'm facing difficulties in regards to some disk issues if you guys can help me. I am using Windows Server 2003 for my File Server. For the past few days in Disk Management the status of two of my (...
Mujtaba Omarkhail's user avatar
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2 answers
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Installing VMware vsphere 5 on multi raid array server

We recently bought a new server that came with 2 600GB disks in a Raid 1 and 5 2TB disks in a raid 5. Initially this was going run Windows Server 2008 R2, however, it was decided to now run VMware ...
Web's user avatar
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raid5 samba upload write slows down

I have Samba installed on a server, that has 8 2TB HDDs in raid5, os is debian 2.6.32, 64bit. When I copy a 3.5GB file to the server, the first GB is transferred with about 100MB/s, but afterwards the ...
titus's user avatar
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1 answer
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Software Raid 5 in Enclosure - Server Crash - Hope?

I'm a software guy. I have inherited a Windows 2008 server that had a 4 disk raid enclosure (one of those Rosewill ones from NewEgg I think) connected to it via eSata. The Windows server was ...
Scott Davis's user avatar
3 votes
6 answers
3k views

Server RAID died. How would you recover data from its drives?

We have 9 machines at the moment. One of them had an electrical fault which fried the board but the drives seem ok. I'm not entirely sure how I would even attempt to recover data from it. The drives ...
samdunne's user avatar
1 vote
2 answers
218 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 ...
user915831's user avatar
-2 votes
2 answers
796 views

Ideal RAID1+RAID5 configuration?

What is the optimal RAID1+RAID5 configuration and why? My thinking is: RAID 1 SAS 15k 146GB drives for the OS. RAID 5 SATA 7.2k 300GB drives for the data. My opinion is that the OS partition should ...
Kryptonite's user avatar
1 vote
1 answer
289 views

Linux software RAID-5: failed drive doesn't degrade the array

I have a CentOS 6.0 install sitting in a Hyper-V VM. I'm trying out some of the software RAID features of Linux and I've got a RAID-5 array made up of virtual SCSI disks. Most of it works fine: if I ...
Adrian's user avatar
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7 votes
3 answers
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Is it safe to transfer RAID 5 disks from one server to another?

I have (what I assume) will be a relatively simple question. I have an old file server that I've decommissioned and replaced. I would like to re-use the hardware from the old file server at our ...
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mdadm and RAID-5 recovery

I am encountering some problems with my RAID-5 array, using mdadm and Debian. First of all, I lost a drive (completely, it is not even recognized by the BIOS), then I replaced it with a new one; ...
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5 votes
5 answers
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Is it safe to mark a disk ok, in a degraded RAID 5 array?

Intel Matrix Storage Console 8.9 showed a degraded array with one disk failure. Yet it offers the option to mark the disk as ok and rebuild the array? When would it be appropriate to do this? Does it ...
datatoo's user avatar
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2 answers
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Increasing capacity of RAID5 array [closed]

Assume that I built an 2TB RAID5 array and its running and some data is stored on it. Now I need to increase its size to 5TB. Can I increase capacity (By adding extra drives)? How? If Yes is it ...
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1 answer
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Trouble resizing LVM volume after expanding Areca 1220 RAID 5 array

Thanks ahead for any help. My original setup was an Areca 1220 RAID card with (5) 2TB drives in RAID 5 with a hot spare, making only 4 of them part of the array for a total of 6TB. I then created an ...
mitnosirrag's user avatar
1 vote
1 answer
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Add Automatic hot spare to Windows raid5

Ive been searching all over and cant find anything on this subject. I have a Raid 5 configured in Server 2003 using 3 1.5Tb drives, I have a 4th drive I want to add as a hot spare and I would need to ...
Brian Tacker's user avatar
-5 votes
1 answer
702 views

Debian Squeeze with RAID 10 [closed]

I'm trying to do a fresh install of Debian Squeeze on a server and set it up with RAID 5, or RAID 10 if possible (4 disks). I'm having difficulty finding detailed instructions on how to do this. I'm ...
Brett's user avatar
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8 votes
1 answer
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Configure Windows RAID-5 "drive failed" timeout?

Background When a hard-drive controller detects an error, and needs to remap a sector, the drive normally becomes unresponsive for the seconds (or possibly minutes) it takes to try to complete the re-...
Ian Boyd's user avatar
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9 votes
7 answers
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How long should a RAID Reconfiguration take? (Adaptec 6805)

I'm experimenting with various RAID configurations of a new Adaptec 6805 (not the 'E' model) Attached are 8x Hitachi 5400RPM 2TB SATA 6Gb Drives using the miniSAS to SATA cables provided. I created ...
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1 answer
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Windows 2008 R2 raid 0 over hardware raid 5

I am consider using windows raid 0 and raid 1 over two hardware 4x2tb raid 5 arrays. (thinking Seagate green drives). 2x Rocketraid 2680 controller but that could easily change. So, that would give ...
Sleeper Smith's user avatar
2 votes
4 answers
4k views

2008 R2 Software Raid 5, writing during resynching

I'm build a software Raid 5 under Windows server 2008 R2 with 4 x 2TB SATA2 (i3-540 4GB) I launched the process 24h ago, but the resynch progress is 27% only; - Is there a problem, or is it a normal ...
Kryane's user avatar
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2 answers
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Debian squeeze, mdadm. Degraded RAID5 array after each reboot

/etc/mdadm/mdadm.conf ARRAY /dev/md0 level=raid5 num-devices=4 metadata=00.90 UUID=54e55d36:c3971e21:d484c166:6e86c3d7 devices=/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde MAILADDR root mdadm -D /dev/md0 ...
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1 answer
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Intel RAID Controller Rebuild RAID 5 While Windows Running

We have a RAID 5 array (3 drives) one of which failed this morning. If we take that drive out the system can boot into Windows Server '03 fine. Problem being we don't have anywhere to go if another ...
MikeMurko's user avatar
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2 answers
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Windows 2k3 server RAID 5

I've got a server at home running Windows 2003 Server. I use the server to house my media collection and backups from other PCs on my LAN. The server has 4 1TB drives along with a smaller system ...
haukurhaf's user avatar
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2 answers
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Can I do a Raid 5 with a SAS6i/R?

I have a PowerEdge 2970 server with a: SAS6i/R Integrated Controller for PowerEdge 2950/2970, x6 Backplane http://accessories.dell.com/sna/products/cables/productdetail.aspx?c=ca&l=en&s=corp&...
aron's user avatar
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1 vote
1 answer
281 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. ...
Lewis's user avatar
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5 votes
3 answers
12k views

How can I view Server 2008 Software RAID 5 Resync Progress?

Skipping over the pros/cons of RAID 5, I have a software RAID-5 array made from 3x 2TB disks. I started the sync and nearly 12 hours later the sync is still going. Is there any way that I can view the ...
tombull89's user avatar
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3 votes
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Replacing a Hard Disk in RAID 5 Array with Newer Version

Recently, 1 out 4 disks in my RAID 5 array failed. I searched for a replacement part and learned that only a newer version of the hard disk is available. This "newer" version has the exact same specs ...
Ari's user avatar
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2 votes
1 answer
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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 ...
murgo's user avatar
  • 133
0 votes
2 answers
423 views

NAS software options?

I want to build a NAS that supports hard links (linux based, NFS?) due to the software that will use it. I need some kind of RAID in case of a single drive failure. I really like FlexRaid, but it ...
Scott Szretter's user avatar
1 vote
1 answer
749 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 ...
shifuimam's user avatar
6 votes
2 answers
7k views

Ext4 superblock corrupted after successful(?) mdadm grow and resize2fs

Some system details AMD Phenom II X6 1090T, 16GB DDR3 1600 running 11.04 natty, 2.6.38-8-server Raid in question consists of 5 SATA drives; 4 Samsung, 1 Western Digital; 500 GB each Drives are ...
lose_the_grimm's user avatar
4 votes
5 answers
6k 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 ...
SLY's user avatar
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1 vote
2 answers
299 views

shell script to get raid controler details

How can I get the RAID 5 controller array details using a shell script command?
Arunjith's user avatar
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3 votes
4 answers
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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 ...
warren's user avatar
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0 votes
1 answer
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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 ...
Martijn v E's user avatar
1 vote
2 answers
2k 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 ...
MatBanik's user avatar
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1 vote
3 answers
1k 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: ...
DimitrisD's user avatar
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1 vote
1 answer
308 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 ...
Randy Orrison's user avatar
0 votes
3 answers
690 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 ...
Garuda's user avatar
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2 votes
2 answers
486 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 ...
ensnare's user avatar
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1 answer
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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 ...
Ben Williams's user avatar
1 vote
1 answer
3k 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 ...
Kenners's user avatar
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3 votes
2 answers
12k 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 ...
Androme's user avatar
  • 411
3 votes
1 answer
5k 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 ...
Gary's user avatar
  • 163
2 votes
3 answers
277 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 ...
Phuong Nguyen's user avatar
0 votes
2 answers
923 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 ...
Androme's user avatar
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1 vote
2 answers
348 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 ...
ito3's user avatar
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4 votes
3 answers
3k 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 ...
Ben Hymers's user avatar
0 votes
2 answers
165 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 ...
Uku Loskit's user avatar
6 votes
5 answers
65k 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 ...
jassuncao's user avatar
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