RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.
2
votes
1answer
42 views
cleaning /dev/md0 filesystem ( raid)
I have a CentOS server using raid.
The /proc/partitions contains:
major minor #blocks name
8 0 976762584 sda
8 1 104391 sda1
8 2 921600855 sda2
8 3 55054755 ...
1
vote
1answer
29 views
Can I put 2 disks into a raid-0 array without reformating the FS?
We have an existing /dev/sda disk, we are adding an identical /dev/sdb
I want to place these two disks in a raid-0 array.
Can I do that without reformating /dev/sda?
0
votes
0answers
21 views
Move a Whole Ubuntu Server [duplicate]
I have a machine with Ubuntu 12.04.1 LTS 64 Bits installed on a LVM except for the boot partition
the current settings is
/dev/sda1 /boot 1GB
/dev/sda2 lvm
on LVM
/dev/lvm/root 45GB
/dev/lvm/swap ...
0
votes
1answer
79 views
Can I configure software RAID on an existing server without losing the existing partition?
I've got an existing server with 1 disk and Ubuntu 12.10 installed and running.
I want to add a 2nd disk and configure RAID 0 across the two disks using Ubuntu's software RAID. Can I do this ...
0
votes
1answer
36 views
USB Drive Software Disk Mirroring - Is this the right approach?
I have a 1TB NTFS USB Data Drive (no boot, etc...) that I would like to keep a mirror of as a backup in case of hardware failure.
It is always connected to my raspberry pi running the raspbian ...
2
votes
3answers
143 views
Partitioning EFI machine with two SSD disks in mirror
I have two SSD disks, I want to put them in a software mirror RAID.
But whatever I do the OpenSuSe installation keeps telling me that due to the partitioning scheme he won't be able to install the ...
0
votes
0answers
92 views
How do I set up raid0 using extra two drives (not the install drive)?
I have been looking around online for a suitable tutorial to help me set up a raid0 across two (or more) drives, but not moving the actual installation of Mint onto that raid setup (I have that on a ...
2
votes
2answers
288 views
Change Partition Table with GParted
I have an Ubuntu 12.04 LTS server that has 6x600GB SAS drives in a RAID 5 configuration (Perc 6/i).
The partition scheme looks like this:
Partition File System Mount Point Size
/dev/sda1 ...
1
vote
0answers
164 views
Installing 12.04LTS Server on a Fake RAID10
Scenario
Install Ubuntu 12.04LTS Server on a RAID10 with boot on a RAID1.
4 - 2Tb SATA Hard Drives
3 Partitions (/boot, /, and swap)
boot (256Mb from each disk) setup in RAID1 /dev/md0
partition ...
0
votes
0answers
45 views
FS corruption just a coincidence?
Yesterday I replaced one of the HDDs in my remote server. The setup is simple - Debian Linux (testing), software RAID 5, LVM with 4 partitions on it, home, var, usr, and swap.
I pulled the old disk, ...
2
votes
0answers
100 views
Disable RAID auto detect at runtime
In Linux, I'm partitioning two disks for RAID1 with fdisk. The first disk partitioning succedes, but the second fail because the raid starts automatically and occupy also the second disk (why? it ...
0
votes
1answer
101 views
Fresh installation of debian and raid10 array with SSD and HDD
I have one 120Gb SDD and four 2Tb HDD at disposal. I would like to install Debian Squeeze on the SSD and create a software RAID10 array with the four HDD.
According to your experience, how to ...
0
votes
0answers
235 views
RAID Drivers and Support for an AMD SB950 Chip?
I have an Asus Sabertooth 990FX R2 motherboard which uses the AMD SB950 chipset to create a fakeRAID array (setup for RAID 5 in my case). It is recognized as a RAID array in Windows after install of ...
0
votes
3answers
122 views
Automatically run kpartx during boot
I'm running Debian Wheezy on an SSD, and in addition I have two 500GB hard disks in Intel software RAID 0 (fakeraid). Both the SSD and the RAID array have GPT partition layouts. I have set up my fstab ...
1
vote
1answer
133 views
RAID 1 + 0, Solaris 10
I create the meta devices:
metainit d102 1 1 /dev/dsk/c1t2d0s6
metainit d103 1 1 /dev/dsk/c1t3d0s6
metainit d104 1 1 /dev/dsk/c1t4d0s6
metainit d105 1 1 /dev/dsk/c1t5d0s6
then I make the mirrors ...
2
votes
3answers
150 views
Can I create a software RAID 1 with one device
I have a single disk that I want to create a Mirror of, Lets call this disk sda I have just bought another identicle size disk, which we can call sdb. sda and sdb have one partition called sda1 and ...
0
votes
2answers
173 views
Can disks be accessed independently in a RAID-1 volume?
I want to create a RAID-1 array with Debian 6. This array will contain 6 disks, 3 for the OS and 3 mirrors.
I used this RAID before but on windows, and maybe I didn't do it good at all, because I ...
4
votes
2answers
116 views
Where did 47gigabytes of space go?
Clean installation od Debian squeeze 6.0.6 x64 on intel atom 230, with 3 HDDs, with 3x500GB.
df -h shows :
datastore size used free % mounted
/dev/md0 917G 909M 870G ...
0
votes
0answers
110 views
Adaptec 2610SA (RAID controller) is not detected by Debian Squeeze 6.0.6 installer. What to do?
Big problem. I have a Gigabyte GA230CD with intel atom 230 and 3 WD RE4 disks. Problem is, that any disks connected to the Adaptec 2610sa RAID controller cannot be seen in Debian Squeeze installer.
...
0
votes
2answers
182 views
Atom 230 + 2GB RAM datastore for small server = 64 bit or 32 bit debian
would you recommend me for small debian linux with small apache, small mysql and primary datastore with SW RAID 5 just 32bit debian or rather 64bit and why?
I have only 2 GB of RAM, so could that be ...
0
votes
2answers
114 views
Can I mount a microsoft mirrored dynamic disk?
I'm testing out sw raid in windows 7, but I almost always use linux and I would like to know if it's possible to mount such a mirrored dynamic disk.
I can already mount each members separatly but ...
1
vote
0answers
100 views
What chunk size for KVM under Debian linux is optimal with RAID 5?
I would like to know, how to set optimal chunk size for my debian squeeze in future.
I Work with 3x WD RE4 500Gb 7200RPM in SW-RAID 5, under debian squeeze. (in the future maybe under wheezy)
I Saw ...
1
vote
1answer
122 views
How to rebuild a two drive raid 1 array on Linux?
I need to rebuild a two drive (160x2) raid 1 (mirror) array. It was an Intel raid from a 7 year old Dell computer (Windows). Both drives are assumed to be functioning. The raid was created with an ...
2
votes
2answers
407 views
Very slow SW-RAID 5 in Debian Squeeze
I don't know why, but I have big trouble with speed of my raid.
I have 4x WD RE4 7200RPM 500GB. Size of RAID 5 is 1000GB. 1 of HDDs is Spare.
Problem is here:
Every 1,0s: cat /proc/mdstat ...
0
votes
1answer
132 views
SW-RAID 5 - how much CPU time and performance can it take?
I have Debian squeeze 6.0.4, 4x WD RE4 500Gb 7200RPM, Athlon II X4 600E and 24GB RAM DDR3.
Since I work with SW raid 5, it takes much more CPU, than I think is enough.
How can I get know, how much ...
1
vote
1answer
139 views
IO Error on RAID5 member. What to do about bad blocks?
I recently got an IO Error on one of my RAID5 members; on a 3 disk fakeRAID array. I didn't notice at the time - there was only a message in /var/log/kern.log - so I had continued running the machine ...
1
vote
1answer
254 views
Complete install on RAID1 + LVM
When doing a complete install of Linux is it possible to install everything including /boot on 2 software RAID 1s (4 hdds) + LVM?
I haven't been able to figure out whether this is definitely ...
1
vote
2answers
183 views
Can't remount local file systems for read-write (RAID1)
I assembled a new machine on Asus P9X79 motherboard, using its RAID controller to create a RAID1 array of two 500Gb drives.
When booting Arch from an external drive I am able to work fine with ...
3
votes
1answer
264 views
Unable to mount raid on my NAS, trying to rescue the data, how should I proceed?
A short backstory: something happened on my Synology NAS, apparently a buggy mailserver program that came with an update stopped the device from seeing the 2x3TB drives I have. After a lot of ...
2
votes
1answer
139 views
Ubuntu Software Raid5 - /dev devices changed, will mdadm raid break
I had a major server failure. The OS is fine and back up and running. Before I plug my raid drives back in and try and mount it I need to ask this simple question.
The drives that originally mapped ...
2
votes
0answers
253 views
Bad superblock after server crash
My server (CentOS 6) crashed, and it now kernel panics on boot. It's currently using a mdadm RAID1 array with two 1TB drives.
vg_server2422-LogVol01 is /
vg_server2422-LogVol00 is Swap
...
1
vote
2answers
1k views
How to set up disk mirroring in Ubuntu?
I have a computer with two WD 1TB drives and I want to configure disk mirroring on it.
I tried setting up RAID during the installation by creating RAID partitions but that does not work for me.
Is ...
1
vote
1answer
55 views
ServeRAID error in syslog, is it important?
I was checking the logs in server when i came across this message.
Nov 4 12:52:05 SERVERNAME ServeRAID Manager Agent: [338] Periodic scan
found one or more critical logical drives: controller 1. ...
0
votes
1answer
119 views
RAID disk lost in just one machine
I have a Blade Center H and a DS4700 SAN. Today we detected one problem in the mail service in one of the blades. It can't see a particular volume available in the SAN. All other blades can see SAN ...
1
vote
2answers
229 views
Linux software RAID-1 and device name
I want to set up software RAID-1 on my Ubuntu system, and found this example of an /etc/raidtab:
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
...
4
votes
1answer
226 views
Alternatives to LVM
I was thinking about alternatives to combine several HDDs together.
The only options I know so far are using LVM and/or RAID.
The thing is, using LVM, I will most probably lose all data, if one ...
1
vote
1answer
2k views
Raid 0 Linux Installation fails to install grub
I have a Raid 0 setup (striping) via BIOS not through software raid. When I install linux mint or Ubuntu it fails to install the boot loader or set the boot loader to boot. I get an error stating ...
8
votes
2answers
2k views
Whats the difference between mdadm state “active” and state “clean”
I two different computers with different RAID5 arrays. When I run the command
mdadm --detail /dev/md0
one drive reports "active" while the other reports "clean" for the "state" field. What is ...
2
votes
1answer
208 views
Migrating from hardware to software RAID
I have an old PCI-X controller running 8 drives in RAID 5. I'd like to dump the controller and go to software RAID under Ubuntu. Is there a way to do this and retain the data from current array?
...
3
votes
2answers
87 views
RAID Lag-Behind Burst Write
I would like to setup RAID1 so that a ramdisk in the RAID configuration has occasional synchronisation with a physical disk (that is very battery intensive to run, so I hope to let it spinout).
Is ...
0
votes
0answers
57 views
Is it good to have partition of 800GB on RAID1? [closed]
Is it good to have partition of 800GB on RAID1?
I am planning to install a server with
/boot - 500 MB
/ - 50 GB
/opt - 800 GB
SWAP - 8 GB
All the partition with RAID 1 on two WD enterprise HDD.
...
4
votes
1answer
104 views
ext4 directory lists as a file
I'm working with a large (8TB) EXT4 filesystem in linux. After a power outage, the filesystem wouldn't mount. fsck is taking weeks to complete, but i ran testdisk and i'm able to see my partition ...
1
vote
0answers
154 views
Dual/Triple Booting with dmraid and non-raid disk
I currently have 3 hard drives in my computer
The first two disks are in a RAID-1 array, using an Intel P55 chipset, and accessed through dmraid, with the third drive partitioned like so:
Filesystem ...
1
vote
1answer
463 views
How do I know that a /dev/dm-XX device isn't used by anything on SLES 10.4 (64bit)?
I have a device that I can see in the output of fdisk -l:
/dev/dm-XX
(XX is a number.)
How do I know that I can use this /dev/dm-XX to add it to a RAID1 array? How can I be 100% sure that nothing ...
4
votes
1answer
706 views
RAID 10 can not be started
I have a RAID 10 array managed with mdadm which has failed . The symptom was that X has crashed and I was unable to logon from the terminal. I have restarted the computer and /dev/md1 did not start.
...
2
votes
0answers
240 views
Media server RAID difficulties (on FreeNAS)
Disclaimer: I've never used FreeNAS or any type of RAID before, so this is a first.
I've decided to build a media server in my new apartment. I'm going to be going with a total 10TB of space (6x2TB ...
2
votes
0answers
223 views
Software raid checksumming slow
On my new 24 disk array I get 900 MB/s of raw read or write using dd to all the disks.
When I set the disks up as a 24 disk RAID6 I get 400 MB/s write and 600 MB/s read. It seems to be due to ...
3
votes
3answers
1k views
Mounting multiple devices at a single mount point on Linux
Is there a way to mount multiple hard drives to a single mount point? Let's say I run out of space on /home and decide to add an extra hard drive to the computer. How do I scale the space on a mount ...
2
votes
1answer
1k views
Linux: LUKS and multiple hard drives
I have a Debian Linux system (amd64) installed on a RAID-1 system encrypted device (LVM on LUKS) and will have a RAID-6 of >=4 disks where I'll put my data (LUKS and maybe LVM).
I think the basic ...
1
vote
2answers
427 views
Software raid + separate partitions?
I have setup software RAID1-arrays using two 250GB harddrives. There's two arrays - one named md0 in which the system is kept and the other, md1 works as swap:
# cat /proc/mdstat
md0 : active raid1 ...
