RAID 1 is the official name for mirrored disks or volumes
12
votes
2answers
4k views
combining SSD and hard disk in software RAID1?
Does it make sense to build a Linux software RAID-1 (mirroring) using an SSD and a normal hard disk? I want to combine the advantages of SSD (fast transfer rates, fast access times) with the ...
12
votes
7answers
9k views
Simple mdadm RAID 1 not activating spare
I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin.
The command sudo mdadm --detail /dev/md0 used to ...
11
votes
11answers
54k views
What's the difference between RAID 1 software mirroring and Fake RAID?
I've just ordered two new hard drives for my main desktop and a copy of Windows 7 Professional 64-bit. I'd like to do a clean install of Windows 7 onto the new drives (leaving my old Windows XP ...
10
votes
2answers
5k views
Does software RAID 1 in Windows 7 improve read speeds?
Does software RAID 1 (mirroring) in Windows 7 improve read speeds?
I'd like to set up RAID 1 to help protect my important documents (yes, yes, I know it's not a backup), but performance is also ...
6
votes
3answers
2k views
Practical RAID Performance?
I've always thought the following to be a general rule of thumb for RAID:
RAID 0: Best performance for READ and WRITE from stripping, greatest risk
RAID 1: Redundant, decent for READ (I believe it ...
5
votes
4answers
12k views
Can a mirrored (RAID-1) disk be plugged into another system to be read?
If I have some disks in a RAID-1 configuration, can I just take out one of them and plug it into a different system to be read?
I mean treating it on the target system just like an ordinary disk, ...
5
votes
3answers
3k views
In Ubuntu, how to get email notifications about (software) RAID problems?
I know getting email notifications should be possible, and perhaps even enabled by default... But how to make sure alerts are properly configured, and if, for any reason, they arent't, how to set them ...
5
votes
5answers
956 views
RAID 1 not performing as expected
I recently bought a new 320Gb hard drive for my computer to set up RAID 1 on it for some added security. Installation went as smooth as could possibly be (plug in power, plug in data cable, start up ...
5
votes
3answers
3k views
Hybrid SSD/HDD RAID
I just read about Hybrid RAID arrays consisted of SSDs and common HDDs which are supported by Adaptec's RAID controllers. Is such RAID configuration real advantage? Isn't write performance downgraded ...
5
votes
3answers
4k views
Can I take my ReadyNAS drive in Raid1 and plug it straight into new different machine?
I would assume that I can just take my HDD out of my NAS (in raid1 mirror) and plug it into another enclosure and have it work off the bat but I'd like to make sure...
Any ideas?
Edit:
My current ...
5
votes
1answer
1k views
A ZFS or LVM or MD redundant heterogeneous storage proposal
I have the same problem most people have: how to create a reliable personal storage solution with the fact that:
Hard drives fail with alarming regularity. Losing files is unacceptable.
I will buy ...
5
votes
2answers
251 views
Do newer Mobo's do RAID in a way that allows the disks to be viewed as a normal non-RAID HDD if transferred to another computer?
I built a new PC this weekend, and one of the joys I had was to transfer my RAID 1 array to the new system with a different mobo. The disks were not recognized at all, by either the mobo (no ...
4
votes
5answers
28k views
How to install RAID drivers on already installed Windows 7?
64-bit Windows 7 Ultimate
6GB RAM
Intel i7 920
Intel X25-M SSD 80GB 2,5"
Club 3D Radeon HD5750
GA-EX58-UD4P Motherboard
I've been running fine with Windows 7 installed on the SSD. I wanted to ...
4
votes
2answers
773 views
4
votes
1answer
566 views
SSD in RAID 1 Questions
I want use SSD drives in RAID 1 setup. Although performance is important, reliability comes first, so I'm going with Intel drives (either the 320 or 510 series).
This will be installed in a Dell ...
4
votes
1answer
2k views
What exactly does a RAID 1 resync do?
I just have a quick question about RAID 1 resyncs. When a RAID 1 array performs a resync is it actually copying all the data from one disk to another or is it just analyzing the data on the disks and ...
4
votes
1answer
175 views
Is TRIM disabled even with Windows Soft RAID 1 (Windows Dynamic Disks)
I am looking to build a Windows 2008 Server and wanted to use a RAID SSD array, either via SATAIII or PCIe.
Everything I've seen that RAID does not allow TRIM commands to be passed to the SSD, ...
3
votes
3answers
5k views
Removing raid 1 (mirroring) and leaving data on both drives
I have two drives in a raid 1 (mirroring) array. Hardware raid using whatever is built into an Intel motherboard. (asus P5BE)
I'd like to remove one drive but keep the data in both (I want to put one ...
3
votes
4answers
3k views
Does RAID 1 protect against corruption?
Does Raid 1 protect against data corruption? For example, let's say that I am keeping all of my important files on a NAS that uses 2 disks in a RAID 1. If one hard drive has some kind of internal ...
3
votes
3answers
319 views
RAID 0 + 1 with 3HDD 2x1TB + 1x2TB
Is it possible to make RAID 0 + 1 with 3 Hard Drives
I have currently setup raid 0 with 2x~1TB HDD (1.8TB approx)
Now i got 2TB HDD (1.9TB approx) which i want to be as a mirror drive.
Is is ...
3
votes
4answers
9k views
RAID vs AHCI on Windows7 x64 ASUS
I have an ASUS p5ke-wifi/ap which has built-in RAID controller. From the BIOS, I can choose between 3 controller types:
IDE
RAID
AHCI
In that order. This setting was set to AHCI when I installed ...
3
votes
2answers
340 views
Can RAID 1 have more than two drives?
Recently I had a discussion with a teacher of mine. He was claiming that you could set up RAID 1 with five drives and that the data would be mirrored over all of these drives.
I told him a RAID 1 ...
3
votes
1answer
786 views
Malfunctioning TS-239 Pro II+, how do I recover my data?
I'm in a real bind here. About a week ago I bought a QNAP TS-239 Pro II+ and transferred all my important data across to it. It's a 2 TB RAID 1 array, because I really don't want to lose this stuff.
...
3
votes
3answers
2k views
Does RAID1 increase performance with Linux mdadm?
I have a cheap 2-bay NAS with a 2TB HDD. To be robust against disk failure, I'm thinking of buying a second 2TB HDD and putting it in RAID1 with Linux mdadm. The file system is ext4.
Will this ...
3
votes
1answer
147 views
I'm trying to mirror drives of the same model, but one appears to be slightly larger
I'm trying to mirror a drive using Disk Management in Windows Home Server 2011. The target drive (Disk 1) is the exact same model as the source drive (Disk 0), but the target drive appears to be 1MB ...
3
votes
0answers
84 views
Use Intel Rapid Storage Technology with a secondary PCIe RAID card
I have Intel's RST on motherboard using RAID1 (2x2TB) and a boot drive. Trying to add another RAID1 (2x3TB) has failed since RST is limited to 2.2TB for RAID1. Now I've bought another RAID card in ...
2
votes
2answers
824 views
How does RAID 1 determine whether a disk is corrupted?
I've built a RAID 1 array of 2 disks, A and B.
That means that every bit on A is equal to a bit on B. If one disk fails, I can safely retrieve my data from the other disk. But then I started ...
2
votes
3answers
7k views
Motherboard RAID support or Hardware RAID controller?
About a year ago when I was researching how to set up some drives using RAID on a PC I was planning to build, everyone said I would need to purchase a hardware RAID controller, the decent one was ...
2
votes
3answers
2k views
RAID1 Setup - Are Empty/Blank/New hard drives a requirement
I need to setup RAID1 (software/hardware).
I have a 1TB (no space left), can I buy a new 1TB and setup RAID1 successfully without a remote chance of loosing anything on the existing 1TB, as I got it ...
2
votes
2answers
506 views
In Wikipedia, it says RAID 1 has a space efficiency of 1/n. Can that be correct?
right now on Wikipedia, it says RAID 1 (Mirroring) has a space efficiency of 1/n, and
Space efficiency is given as the
amount of storage space available in
an array of n disks, in multiples of
...
2
votes
3answers
4k views
Firmware vs OS RAID (aka Windows 8 Disk Mirroring vs Intel Onboard)
So Windows 8 is out and I have a new motherboard. I wish to create a RAID 1 coupling between two HDDs -- for storage purposes only (my OS is on an SSD) -- but I don't know which is the best route to ...
2
votes
2answers
2k views
How to fix missing RAID1 drive
I had to do some fiddling about with my cables inside thebox and now I am getting a "Critical Error" about the RAID disks during startup. I have a gigabyte GA-MA770T-UD3 motherboard. Aparently the ...
2
votes
1answer
282 views
Can I mix a 15K drive with a SSD drive in a hardware RAID1?
I've got a hardware RAID1 of two Hitachi 15K drives here, forming the array with an Adaptec controller. Let's assume one disk dies and I'd like adopt SSDs. I would then replace the dead drive with a ...
2
votes
2answers
1k views
How does one enable --write-mostly with Linux RAID?
Unfortunately the mdadm and mdadm.conf man pages are not quite up to par. I would like to enable the --write-mostly flag for my RAID, but neither the man pages nor the internet will tell me how. I am ...
2
votes
2answers
431 views
Are there any good software-based RAID 1 mirroring alternatives to Windows 7 Computer Management?
I only have Windows 7 Home Premium, not Professional, so the mirroring option isn't available in Computer Management. Are there any good alternatives?
It's possible RAID 1 is overkill for what I'm ...
2
votes
1answer
423 views
Ubuntu 12.04 boot degraded raid
I've installed Ubuntu 12.04.1 in a new server and set up the 4 hard drives with 3 RAID 1 devices, the configuration is such that the first two drives have md0 (swap space) and md1 (/) with the third ...
2
votes
2answers
516 views
Converting software RAID1 to hardware RAID1 without losing data
I have a home server running Ubuntu Jaunty and housing a 2 x 2TB RAID1 array. It is a software RAID but I'm looking to pull out those drives and put them in a external RAID enclosure to save space. My ...
2
votes
1answer
6k views
RAID 1 - “Add Mirror” greyed out
I am trying to RAID 1, two hard drives in Windows Server 2008.
They are the exact same make and size.
One has data on it the other is blank and formatted.
They are both set as dynamic disks.
...
2
votes
1answer
232 views
Recoverable RAID configuration for Windows 7
I'm getting Windows-7 in the next couple days to install on a home-built 2-disk system. The motherboard supports fake-raid, so I'll be setting up some RAID0 and RAID1 volumes. My hope is to make the ...
2
votes
2answers
1k views
Windows XP SP3 does not recognize my RAID SET?
I have a EP45C-UD3R motherboard and recently installed a Sil3132 PCI-E controller with 2 500GB Sata2 HD, at bios level the controller is recognized and I can setup my RAID SET which I set to RAID1.
...
2
votes
3answers
207 views
Does Firmware RAID negatively affect non-RAID devices?
I am running Windows 8 on a Z77 Chipset mobo, and it's all running swimmingly, but I want to put my documents/music/etc. on two HHDs running under RAID 1.
On my motherboard I have four SATA 3GB/s ...
2
votes
2answers
495 views
How to set up software RAID 1 on Ubuntu 12.04?
My primary partition is sdb. I add new disk (sda) and formatted it as shown below:
fdisk -l
Disk /dev/sdb: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 ...
2
votes
2answers
2k views
Raid 1 mdadm (linux) disk failure recovery: DRDY err (UNC) keeps repeating can't reach login
Over the weekend, I got several emails from our network storage server (just a custom box with CentOS 5 and 2 2tb drives software raid 1) indicating SMART detected issues with one of the drives.
I ...
2
votes
3answers
910 views
RAID-1 and regular drive removal (using RAID-1 as a backup measure)
Is using mdadm's RAID-1 of 2 partitions (one on laptop's internal HDD, one on external HDD) a good idea.
I want the system to work as RAID-1 if both drives are present, work as regular volume ...
2
votes
2answers
1k views
Accidentally set BIOS from RAID -> IDE; now data inaccessible
Update #1
1) Booted into Ubuntu Live CD
2) Connected drive using a SATA->USB converter
3) Very meaningful error message:
Error mounting: mount exited with exit
code 13: $MFTMirr does not match ...
2
votes
0answers
114 views
Windows 8 keeps deleting files from RAID drive
I have an ASRock Z77 Extreme4 motherboard with Windows 8 (not Pro).
Brand-new computer, built from new parts.
I use a 600GB drive (10,000RPM) as boot drive (let's call it HD1) and 2 3TB drives in a ...
2
votes
0answers
158 views
Cloning Ubuntu mdadm RAID1
I would like to clone a pair of RAID1 drives created with mdadm. I've tried Clonezilla, but there's no native support for mdadm, so it resorts to using dd which is incredibly slow. I've looked for ...
2
votes
0answers
501 views
Why does an Intel RST RAID 1 array write faster with write-back cache disabled?
I have two HDDs (5900 RPM) in RAID 1 (mirror). I know, I know, it's painfully slow. I'm currently in the process of replacing them with faster drives, hence this question while I'm testing things.
...
2
votes
1answer
106 views
Booting Ubuntu with a RAID-1 Boot Failure
I'm planning on picking up 2 SSD cards for my file server and installing Ubuntu on them using softRAID-1. I will not be keeping a hot spare, so I want to make sure that, if one drive fails, I can ...
2
votes
0answers
522 views
Is it possible to use software raid in Windows 7 on the boot partition?
I want to use RAID 1 on my workstation configuration at work, and I've been looking at using the build in mirror functionality in Windows 7. When you click on the add mirror option it presents you ...
