Tagged Questions

1
vote
1answer
116 views

ZFS about 7.2% disk space is lost

I know that ZFS reserves 1.6% disk space for copy-on-write. However, I am losing more than that. I have a ubuntu server with native ubuntu-zfs installed. The server has 45 drives, each 3TB. I am ...
0
votes
1answer
55 views

Mirror two software RAID volumes

I have two software RAID volumes of differing speed and reliability on Ubuntu 12.10. I want to mirror the contents of the faster, but less reliable /dev/md0 to /dev/md1. My plan was to build a ...
-1
votes
1answer
53 views

Is RAID the right way to go on an Ubuntu 11.10 server running on old hardware? [closed]

I have an older computer running Ubuntu server 11.10. It has an 20GB IDE drive in it which is the main system drive. This system works great as a git repository, VPN, SSH, etc. I wanted to also have ...
2
votes
1answer
196 views

How do I preseed a simple RAID5 setup on Ubuntu Server? [closed]

I have three 2TB drives in the machine; I want a RAID5 of ~4TB capacity, and 100GB or so of swap space. No LVM, no encryption, no fanciness. This is easy to do using the interactive installer, but I'm ...
1
vote
1answer
1k views

mdadm rebooted, array missing? can't assemble?

Not sure what is going on with my Array. I rebooted ubuntu 12.04.1 and got a error on startup that fstab couldn't mount the filesystem UUID I have for my mdadm array. After running a few commands a I ...
0
votes
0answers
32 views

Software Raid mounts random partition

I have mounted Ubuntu server 12 on 2 drives with software raid. I have raid 1 on 4 partitions and raid 0 on swap. Every time I reboot the system now a different partition from the 2 appears as active ...
0
votes
1answer
309 views

Ubuntu server 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 ...
1
vote
0answers
250 views

Ubuntu 12.04 Server Software RAID1 - Faulty Spare - Smart Output Passed - Confused

I think I'm having an issue with one of the hard drives on my array and I'm just trying to troubleshoot what's happening. Its saying Faulty Spare and then after reboot it just says removed: ...
2
votes
3answers
175 views

Analysing Disk IO Traffic

I am running a web server (Ubuntu 11.04) that exhibits unexpected high write traffic. When the server is not supposed to write at all, the amount of write traffic is comparable to the read traffic. ...
-1
votes
2answers
421 views

Determining the software RAID configuration on an Ubuntu server

I have an Ubuntu box which was installed by an admin who is not with me now. I have no information on how he configured the RAID and neither no experience on setting up a software RAID on Linux ...
4
votes
1answer
294 views

3 drives fell out of Raid6 mdadm - rebuilding?

i had an mdadm raid6 array with 13x1TB drives. Within 10 minutes 3 of these drives fell out of the array... we assume bad cable to the controller card and replaced, however now we need to get the ...
1
vote
1answer
676 views

Ubuntu RAID5 Software Raid inactive - unable to boot into Ubuntu from non-raid drive

I have a server with 6 disks in it, 5 of which are in a RAID5 array. I came home from work today to find that the landlord had been through the house with a sparky, and the power had been reset. Now, ...
0
votes
1answer
527 views

Ubuntu software raid on efi, how to boot off second drive?

I'm up and running on Ubuntu server with software raid 1 with 2 500GB drives and I'm just trying to test things out. If I unplug the second drive I'm able to boot in degraded mode but if I unplug the ...
2
votes
1answer
643 views

Moving 4 Ubuntu software “RAID” disks to a new computer - How to make sure it works immediately?

Thinking in terms of the future, let's say I buy 4 external disks, set them up with Ubuntu Server 12.04 software RAID 1+0. Then later after some usage I want to stick them on a new computer - how do I ...
2
votes
1answer
859 views

Configuration Tuning for PostgreSQL 9.1 PostGIS 1.5 Ubuntu 12.04 Server

My server performance is poor. At times SSH, top, and other features or commands are very slow to respond, taking several seconds or more. A query that normally takes 5 minutes can sometimes take 30 ...
0
votes
2answers
357 views

recovering data from raid1 component disk

Need to recover data from raid1 component disk using ubuntu live usb disk. The existing software raid was broken. After many attempts, I removed degraded raid setup from BIOS but ubuntu live could not ...
1
vote
1answer
992 views

Ubuntu EC2 Raid0 Ephemeral — SSH connection after reboot

First, I launch a fresh large instance using the Elestic AMI ami-c162a9a8. Initially, I run: df -h /dev/xvda1 9.9G 814M 8.6G 9% / udev 3.7G 4.0K 3.7G 1% /dev ...
0
votes
2answers
427 views

Forgot to create a second RAID for swap partitions in Software RAID 1. Will it work?

I have a Ubuntu 11.10 headless machine setup with Software RAID 1. It has two drives, each drive has a main boot partition (sda1 & sdb1) and a small swap partition. I created a raid for the boot ...
0
votes
1answer
625 views

spares missing on ubuntu mdadm software raid 5 how to disable?

I want to understand and if it makes sense, disable the alert message I receive about spares missing on my ubuntu linux software raid 5. I used mdadm and set up a /dev/md0 raid volume made up of 3 ...
0
votes
1answer
209 views

Missing RAID 6 array + LVM volume after hard reboot

After a restart which stalled, I did a hard reboot and now mdadm can't see the RAID 6 array anymore, LVM can't find the volume which was on that raid array. I have looked into /etc/mdadm/mdadm.conf, ...
1
vote
2answers
899 views

Software RAID 5 vs RAID 6 performance

I had an original software RAID 5 setup under Ubuntu 10.04.03, 3 devices, 64k chunk. Performance was acceptable: # 4GB write dd if=/dev/zero of=ddfile.big bs=1MB count=4k 4095290816 bytes (4.1 GB) ...
5
votes
4answers
991 views

Ubuntu raid - replacing drive?

I've set up software RAID1 with the latest Ubuntu version - 11.04 using two 250GB harddrives which initially worked great. Tried to unplug both and computer still started with degraded raid status - ...
6
votes
1answer
435 views

Linux fails to reassemble RAID array after disk upgrade

I have an Ubuntu (9.10) machine with 4 SATA disks. Each disk is partitioned identically, with the first few gigabytes set aside for a RAID 1 array (/dev/md0) for the boot volume, and the ...
1
vote
2answers
811 views

Software RAID, LVM, and Encryption Setup Questions

I have 4 hard drives, each with two partitions on them 10.1GB for swap and 990.1GB for the rest. I took this and set up two MD devices with RAID10, one for the set of 4 swap partitions and one for ...
1
vote
3answers
399 views

Active Drives and Spare Drives (RAID10)

I'm setting up software RAID on Ubuntu Server 10.04; specifically RAID10. It's asking for the number of active devices for the array and the number of spare devices. I know RAID10 is two mirrored ...
0
votes
1answer
221 views

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 ...
4
votes
1answer
741 views

Encrypted LVM on RAID1 - Failure testing, manual mount

We have an Ubuntu 10.04 LTS server set up with LVM running on top of disk encryption, which runs on top of a RAID1 volume comprised of two physical SATA disks. The configuration looks like this: ...
2
votes
2answers
270 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 ...
0
votes
1answer
918 views

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 ...
1
vote
1answer
1k views

Linux software RAID that uses system RAM for write cache

Is it possible to configure software RAID 5 on linux that uses system RAM for write cache? I have a file server with 8GB of RAM ... would be really cool if I could dedicate 4GB to write cache. If ...
3
votes
2answers
150 views

How to know which Sata Channel my dev/sd* associated with

Just in case for me (and others) when a software raid 5 degraded, how do I know which Sata Channel my dev/sda, /dev/sdb, etc. associated with, so that we can replace them properly?
4
votes
3answers
2k 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 ...
0
votes
1answer
1k views

How to disable automatic and forced fsck on disks in a linux software raid?

This is the /etc/fstab entry of a raid system /dev/md4 that is controlled with mdadm and webmin on an ubuntu 10.04 64 server: /dev/md4 /mnt/md4 ext3 ...
-2
votes
1answer
590 views

Software RAID vs Hardware RAID

I need more info about RAID. I have a 1U server from Dell R210 with an onboard RAID controller, which I am not able to get to work with Ubuntu install, so I setup a software RAID on Ubuntu. My ...
1
vote
1answer
415 views

MDADM Array Being Limited to 2.0TB

I have an MDADM array with four 1TB disks in a RAID5 configuration. Here's the relevant part of mdadm --detail /dev/md1: Version : 00.90 Raid Level : raid5 Array Size : 2929537920 ...
1
vote
2answers
8k views

How to disable software raid (mdadm)?

I have two 500GB hard disk that were in a software RAID1 on a gentoo distribution. Now I have put the on an Ubuntu Server 10.10 and they still want to be in a RAID. How do I disable the RAID. sudo ...
7
votes
5answers
2k views

Boot Debian while RAID array is degraded

Recently, I came across Ubuntu Server install. During install, it asked me whether or not to allow booting system from degraded RAID array (probably because I installed system onto RAID1 /dev/md0 ...
0
votes
1answer
2k views

How to install Ubuntu server on a Dell R210 with S100 raid controller

I'm trying to install Ubuntu server on a R210 with a S100 raid controller. It's a software controlled RAID, and it's not recognized in Ubuntu. So I guess I have to disable it and use the software raid ...
2
votes
2answers
350 views

move Ubuntu to RAID

I have an Ubuntu Server up and running on LVM2 partition. My motherboard supports RAID 0 and 1. I bought new, second HDD, the same as the system one. I want to set up RAID mirroring to ensure my data ...
0
votes
1answer
542 views

PCI-E 2.0 x8 SAS/SATA RAID controllers recommendations for Ubuntu 10.04?

What RAID controllers are there that meet the following? Works out of the box with good performance with Ubuntu 10.04 LTS PCI-E 2.0 x4 or x8 Support for 8 or more SATA/SAS 6Gb/s drives Enough ...
1
vote
2answers
3k views

Should I use SW RAID / setting up RAID on HP Proliant server with Ubuntu

I have looked at a number of messages regarding software vs. hardware RAID here on SF but can't figure out which one I should use. The server I'm installing is HP Proliant ML330 G6 and the RAID ...
0
votes
2answers
462 views

ubuntu raid problem - different arrays configured, defferent mounted

I've just finished setting up my new ubuntu server 10.4 machine, with 2x500 GB SATA disks - which I intended to configure in raid1; specifically, that's what I did during the instalation process: ...
1
vote
1answer
1k views

How are RAID device names detected at boot on Ubuntu 10.04

When I boot my ubuntu 10.04 server It only partially detects the drives as an inactive raid array with a funny name "md_d1". I have to stop and remove this 'device' every time and then add the new ...
6
votes
1answer
404 views

Should I worry about the integrity of my linux software RAID5 after a crash or kernel panic?

I have a dual core Intel i5 Ubuntu Server 10.04 LTS system running kernel 2.6.32-22-server #33-Ubuntu SMP with three 1TB SATA hard drives set up in a RAID5 array using linux md devices. I have read ...
1
vote
2answers
2k views

Hard drive device names are different from one reboot to another in Ubuntu

I have an Ubuntu machine (10.04 but had the same problem in 8.04) with a bunch of drives that I use as a file server: 1 SATA that I boot off of 2 IDE in RAID1 2 SATA in RAID1 The problem is the ...
3
votes
3answers
2k views

Ubuntu Server Hotswap RAID 1: Hardware or Software?

I'm building new servers for a project I'm working on. They will all run Ubuntu Server x64 (10.04 soon) and require a RAID 1 hotswap configuration (just two drives) to minimize downtime. I'm not ...
1
vote
2answers
1k views

RAID5 and persistent write-intent bitmaps

I have a Ubuntu 8.10 software RAID5 setup that uses 4 active disks and 1 spare. The spare disk has three partitions, one of which is devoted to the spare function. I am using a second partition on ...
0
votes
1answer
7k views

Ubuntu Gnome RAID GUI Tool

I have installed Ubuntu server ("Jaunty") onto a hardware RAID 1 setup. I have now (after successful install) added 2 new drives which I'd like to also have in hardware (or software) RAID 1. When I ...