RAID stands for Redundant Array of Independent Disks, and is a technology which can provide increased reliability, performance, and/or redundancy by utilizing multiple hard drives simultaneously. RAID can be implemented in a computer via either a hardware or software controller.

learn more… | top users | synonyms

1
vote
1answer
143 views

Usability of solid state drives after long term storage without without power

So, I was recently hired on to a company that has shipped out several 24/7 always on servers with solid state drives. I understand that SSD longevity has been improved upon, however to my knowledge ...
1
vote
1answer
3k views

Changing default cache policy online on LSI Megaraid

I am having a RAID 10 with 6 Harddiscs in my server. I had set the default cache policy to write through. After setting up the OS, i came to know the I/O rates are too slow. I read in some forums that ...
2
votes
2answers
4k views

Can I setup two RAID arrays on a single intel z97 controller?

Let me preface this by saying that I have never setup a RAID array myself, other than by using software RAID 0 in Windows for a set of storage drives. I purchased a new ASUS Maximus VII Hero ...
0
votes
1answer
135 views

What's the difference between a RAID enclosure, and a JBOD enclosure connected to a RAID controller

I've currently got an Areca ARC-1222 raid controller card connected to an iStorage Pro JBOD enclosure via miniSAS, on a mac, used for video editing. I'm speccing out a PC to replace it and have become ...
1
vote
1answer
128 views

RAID 0 or btrfs on two SSDs?

I have two 500 GB SSD's, and I would like to combine the two in some way to have 1 250 GB NTFS partition, and 1 750 GB btrfs or ext4 partition. As far as I see, I have two options: the Intel Rapid ...
1
vote
1answer
66 views

Linux RAID on top of LVM

I have LVM configured on top of RAID, but I was wondering how one would do RAID on top of LVM. Here's the scenario: I have a RAID 6 array with 4 X 3TB drives. 1 drive failed, badblocks reported 73 ...
1
vote
0answers
58 views

RAID array failure. False positive?

Background: I have 3 storage units in my PC: an SSD that contains my operating systems a 1TB hard-drive that is about 5 - 6 years old a 1TB hard-drive that is only a few months old The 2 big ...
3
votes
2answers
391 views

Is RAID1 or similar needed for btrfs/ZFS to protect against bit rot?

I'm running a file server using Linux software raid, set up as raid6. As filesystem I've chosen btrfs. However, I'm not using btrfs own raid6 implementation as it's not very stable yet. So basically, ...
2
votes
1answer
70 views

Difficulty removing corrupt directory

I have two disks in raid 0. I ran fsck on them and long story short, didn't fix it completely. I found it is all in a single directory. I dont mind losing this dir completely so i tried to rm it. I ...
1
vote
1answer
31 views

Using Small RAID5's to prevent data loss

I'm currently using 3 RAID5 controllers in each of several media systems. This is being done in an attempt to preempt future data loss. I store large amounts of scanned, video and audio historical ...
1
vote
1answer
38 views

Format system and preserve RAID

I have a system on an SSD, and beside that, a set of 4 disks are connected over software RAID 5. I have a problem with that system now and I'd like to format that system and install a new one. If I ...
1
vote
0answers
126 views

Install Ubuntu on Hardware Raid 1 server , message partition disk

The installer has detected that the following disks have mounted partitions: /dev/sda/ Do you want the installer to try and unmount the partitions on these disks before continuing? If you leave ...
0
votes
0answers
54 views

Moving an existing windows8 installation onto raid

I've tried moving my current windows installation onto a raid0 array and I've run into issues I'm guessing have to do with drivers for the raid not being installed. I used gParted and dd to: backup ...
0
votes
1answer
70 views

What is the difference between “RAID10” and “RAID1 (With more than 2 disks)”?

What is the difference between "RAID10" and "RAID1 (With more than 2 disks)" ?
0
votes
1answer
292 views

Do I need to be worried about these SMART drive temperatures?

I have 5 hard drives in a machine sitting in a cupboard. /dev/sda is a 500GB Seagate drive, and is the boot disk. /dev/sd{b,c,d,e} are 2TB drives in a raid6 configuration. smartctl is showing ...
0
votes
0answers
872 views

Why does my linux box randomly reboot?

I recently had a raid5 array fail (two of four drives failed) on a headless machine I have sitting in a cupboard acting as a file server. I didn't have adequate monitoring in place, so missed the ...
1
vote
1answer
87 views

Windows recovery can't find Windows install

I'm trying to repair my boot loader for Windows after a Ubuntu install killed it. I'm trying to use the Windows Repair CD (actually USB stick), but Windows recovery can't find my Windows install. I ...
2
votes
1answer
85 views

Will hard disks go bad if not used? (Not connected)

I have a Seagate hard drive that I purchased in 2011, but not even taken out of its original packaging. This one was to be used as a spare disk, in case one of two similar drives in my RAID enclosure ...
0
votes
1answer
38 views

Best RAID Solution for dual boot?

I've seen this topic talked about before on this site but with other users using 2 drives for the active partition (booting from the same HDD thats got RAID) however my situation is a bit different. ...
2
votes
1answer
914 views

RAID 0 Volatile Volume Cache Mode configuration

I discovered that in IRST there is an option to set a cache mode for my 3 ssd raid 0 array. I've read the documentation by Intel and have some questions: Are there any overall benefits/risks from ...
0
votes
0answers
294 views

S.M.A.R.T. diagnostics recommends firmware upgrade

I have an Ubuntu server with a RAID-6 array. 3.13.0-27-generic #50-Ubuntu SMP Thu May 15 18:06:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux I was checking out the S.M.A.R.T. diagnostics for the ...
0
votes
1answer
223 views

Intel Rapid Storage Technology missing drives when trying to create a new volume

I had 2 non-bootable HDDs in a RAID 1 configuration through Intel Rapid Storage Technology. Recently IRST started giving out warnings about the S.M.A.R.T. data of one of the drives so I decided to ...
0
votes
1answer
469 views

Disable RAID Controller at BOOT and Partition Each Disk

I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since ...
5
votes
2answers
135 views

Would an array of SSD drives be able to succesfully substitute the system memory?

I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the ...
1
vote
1answer
77 views

RAID 1 (mirroring) [closed]

I just bought a second HDD for backups, it is exactly the same model as the first one. Both drives are secondary, I have SSD for the system. My motherboard is an Asus Gryphon Z87. My questions: ...
0
votes
1answer
386 views

Running OS image from Dell Laptop (set to RAID mode) in VirtualBox [duplicate]

I have two SSD images from two different modern Dell laptops that use the new BIOS that allows you to set your boot mode to "legacy" and then set your SATA mode to AHCI or "Raid mode" (Intel Rapid ...
0
votes
0answers
92 views

Recover Hardware Raid Disk

I have an issue with a raid disk and I was not able to find a solution. I have an Asus Rampage IV Extreme with an Intel controller for raid. I was using 2TB disk in raid 1 with multiple partitions, 2 ...
4
votes
0answers
214 views

mdadm: Win7-install created a boot partition on one of my RAID6 drives. How to rebuild?

My problem happened when I attempted to install Windows 7 on it's own SSD. The Linux OS I used which has knowledge of the software RAID system is on a SSD that I disconnected prior to the install. ...
1
vote
0answers
262 views

Do SSDs have to have AHCI to maximize performance?

After my last post concerning my motherboard's RAID, I'm considering purchasing an additional dedicated RAID controller, but I have a few concerns about what to buy, because I'm facing yet another ...
0
votes
2answers
62 views

RAID Configuration 'seen' through

I have a RAID0 (striped) configuration with the following: 64GB SSD 128GB SSD 640GB HDD I'm turning my PC into a hackintosh, and the installer loaded properly, BUT The installer saw the ...
0
votes
1answer
38 views

Why is RAID rebuild/recovery tied to a specific RAID card?

I would assume that although the RAID specification itself does not detail the implementation, the manufacturer of the card would like to write the RAID implementation just once and reuse that in all ...
0
votes
1answer
95 views

At what point are hard drive bad sectors actually bad?

I'm kind of freaking out here, so I'm sorry if this question may be panicked. So, today, when I started my system up, I took a look at one of the drives in my Raid 0 setup. It showed 7 bad sectors. ...
0
votes
1answer
239 views

Can I move a RAID drive to another Sata port?

I currently have a Windows Server 2008 R2 machine with 4 x 1TB drives in software RAID5 controlled by WS 2K8. I am planning to upgrade to 4 x 3TB in the same software RAID5. Clearly 8 sata ports (9 ...
0
votes
0answers
404 views

No hard drive detected during Debian installation

I'm having problem in installing debian 7.5.0 on Supermicro server running on raid 1 whereby the hard drive is not detected. This server is running 2x 600GB hdd and i'm using DVD images of ...
0
votes
0answers
209 views

How to recover a 12TB RAID 10 array that's showing up as two uninitialized 6TB drives in Windows 7?

I have an ASUS Maximus VI Formula motherboard which was giving me trouble with it's USB 3.0 hub (Intel) so as part of the trouble shooting process I upgraded the BIOS to the latest. Big mistake, ...
1
vote
0answers
250 views

mdadm partiton not large enough to join array

I've used Linux on and off for the last many years, mainly as dual boot or as Virtual Machines, but when I decided to build a Dev Laptop I though I'd bite the bullet and put Linux on as the base OS. ...
-3
votes
1answer
627 views

Reliability of 4 SSD in RAID 0 -vs.-SSD Boot+5440 HDD - in laptop

Question: What are the benefits of SDD RAID 0 over SDD boot with 5400 HDD? Goal: Decision between internal storage options Needs: Ability to seamlessly use multiple graphics and coding programs ...
0
votes
1answer
40 views

external raid 1 system basic questions

For my cubox-i I would like to have external RAID 1 system in order to have a reliable storage. Do RAID external systems work out-of-the-box or are any additional drivers required? Is there ...
0
votes
2answers
106 views

RAID terminology

In the most general sense what is an array and what is a group (also what's a virtual drive)? From here: Redundant array of independent disks (RAID) is a storage technology used to improve the ...
0
votes
0answers
36 views

When setting up RAID, what does the option “data protection” mean?

I'm setting up a RAID and it has the option "data protection". By default it's disabled but can be changed to enabled. I google searched and found this Data Protection: Use this item to enable or ...
0
votes
3answers
443 views

Adaptec Raid Controller 6405E slower than onboard raid?

Running on Windows 8.1 x64. Raid is 0 on two Samsung Evo SSD. Both read and write cache is enabled. Here's result from onboard raid (ASUS-P9X79-E-WS): And here's from the dedicated raid controller ...
0
votes
1answer
105 views

Can't read from the source file or disk on RAID 1 drive

I am getting the following error "Can't read from the source file or disk" when trying to copy a large file. I get the same error no mater what other drive I try to copy it to (which makes sense as ...
0
votes
1answer
59 views

Bios Raid and Windows that wants to format them

I shutdown my PC improperly by holding down the power button. Now Windows sees 2 HDD's with a RAW filesystem instead of my RAID. After the fast shutdown my raid went though the "Verify" stage with 0 ...
1
vote
1answer
99 views

Automatic ESXi backups, is this possible?

Since ESXi does not support software RAID, the only option would be to use a hardware RAID controller. However, I would like to avoid buying one for a while, until I finally decide to keep using ESXi ...
2
votes
1answer
560 views

On-board RAID vs Hardware RAID

They technically are both "hardware" raids, but what really sets the two apart? Wouldn't on-board raid basically be a software raid since they share the same processor.
0
votes
1answer
106 views

Hardware RAID vs. Software RAID [duplicate]

What is the big difference between software RAID and hardware RAID at the low level? What is really going on that sets the two apart? As far as I know, the only difference is the RAID card can have ...
1
vote
1answer
1k views

Does windows 7 disk manager mirror disk or partitions?

My servers Raid 1 disappeared when I did a bios update, And now in order to get it back I have to format my 2 * 3tb hard drives. Which isnt really a solution for me. So I have desiced to try and make ...
1
vote
1answer
2k views

RAID5 vs RAID4 purpose of floating parity

I still did not get why is RAID5 better than RAID4. I understand both computes parity bits that are used for recovering if some failure occurs, the only difference is in storing those parity bits. I ...
1
vote
1answer
81 views

How to determine which drive in a firmware RAID is failing

I have two drives in an Intel ICH10 RAID 1. They are not enterprise-level drives; just regular WD Caviar Black drives. Recently, reading/writing to the mirrored volume has become extremely slow and ...
1
vote
1answer
819 views

How can I restore RAID 0 on my DELL laptop?

I have been formating my dell laptop for quite a while, I bought it back in 2012, with one year warranty, it ended last august, but I think since the moment I formatted it to windows 8.1 I probably ...