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Questions tagged [raid5]

67 questions
6
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1 answer

mdadm checking RAID 5 array after each restart

system info: Ubuntu 20.04 Software raid 5 (added 3rd HDD and converted from raid 1). FS is Ext4 over LUKS. I saw a system slowdown after a restart, so I checked the array status via proc/mdstat, and it show following: Personalities : [raid6] [raid5]…
masterofcards
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5
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How can I mount software raid drive mdX with fstab

I have raid5 configure with gpt partition to allow working with drive larger the 1.6 TB Ubuntu version is 12.04 and the md drive is 5TB. with: mount -t ext3 /dev/md129 /images mount works fine. But when I tried to put the same configuration to…
user245324
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3
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2 answers

NAS Raid 5 Recovery using mdadm: volume and mount issues, please help

Hello this is my first foray into ubuntu, or any form of Linix for that matter, as well as my first attempt to ever recover a lost a raid, but I'm a fairly quick study. I have an 8TB WD Sharespace, four 2TB drives set up on Raid 5 with two "failed"…
Nelliana Calvert
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3
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4 answers

Convert running system to RAID 5

I have a machine with 3 identical disks. I performed a clean installation of ubuntu 12.10 on one disk. How can I convert the running system to boot off a (software) raid5 comprised of all three disks (one of these is in use running the system)? Is…
Ken
  • 133
3
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1 answer

Installing Ubuntu 20.04 (server) as software RAID with three disks

I have a small PC that I'd like to use essentially as a NAS. It has three 2TB drives. I don't know if this is even possible, but I'd like to use software RAID to somewhat secure the data stored on it. More specifically I'd like to use RAID 5 since…
Jonatan Hedborg
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2
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1 answer

Software RAID 5 Disk Failure

I'm going to need some expert help - free beer/coffee to anyone who get's me on my way! My System I'm running Ubuntu 11.10 with a 3 disk software RAID 5 configuration, with 3TB hard drives, in ext4 format. What I Did I recently reviewed the…
user258779
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2
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1 answer

Bash script to check if mdadm is installed if not install it

I am currently working on a bash script to create raid5 with 3 disks and one hotspare. I am confused of how to create a script which first check if mdadm exist, if not it will install it and name it md5. (Raid voulme) Hopefully someone can help me.
user3185936
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2
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1 answer

Raid 5 mdadm --grow drops performance, no increase in disk size

I've set up a Raid 5 system at home for the first time. I've added 3 disks into the pc, and parted them all in 1 partition of 8G, and 1 partition of the remaining 492G then I made 2 raid volumes with each partition Mounted the 16G as swap, and the…
Darghon
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1 answer

grub error: out of disk when booting 12.04 server with hardware RAID5 and gpt

I'm trying to do a new install of 12.04 server on one node of a Dell PowerEdge C6145 with the following spec: 48 cores 512GB RAM LSI MegaRAID 9265 controller 4x2TB disks, configured with RAID5 giving 6TB in total American Megatrends v02.69…
Kieran
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2
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2 answers

Activate spare for RAID-5 in Disk Utility

I have a RAID-5. I'm trying to replace a failing drive in Disk Utility GUI. I added a new drive as a spare, then did "Remove Component" for the failing drive. How do I tell it to actually use the spare (write all the parity data, etc)? I tried…
Colin
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1
vote
1 answer

Change disk in raid 5 system

I have installed raid 5 on my Ubuntu server (software controller). I've used a 250G and two 1TB disks for it (I know it's quite a waste of memory). Can I replace the 250 G hard disk with a 1TB hard disk in the future so that I have more memory in…
user737215
1
vote
1 answer

Combine/Extend 2 raids

I have two Raids, raid5(md0) and a raid1(md128). How can I extend "/"? OS is now on raid 5. root@backup:~# cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid10] md128 : active raid1…
Andrei
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1 answer

Cannot create RAID5 Ubuntu Server 14.04

I'm trying to configure RAID5. I know this question has been asked before but I have been stuck on this for 3 days. Input: sudo mdadm --create /dev/mdo --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1 Output: mdadm: cannot open /dev/sdb1:…
FishCommander
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1
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1 answer

Slow raid5 resync with WD Green drives

The Question Why is my initial resync so slow? Initially cat /proc/mdstat reported ~ 30000K/sec. I then increased /sys/block/md0/md/stripe_cache_size from 256 to 16384. That increased the speed to ~50000K/sec. I changed…
derabbink
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Help with RAID5 array - gone after reboot

I'm newly back to Linux after >20 years. First install was with a beta kernel in ~1992. I've build a home media server with a 4-drive RAID 5 array with the latest workstation version of Ubuntu (server install failed!?!). Set it up fine and started…
Mike
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