RAID solution handled by the operating system.

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0answers
9 views

Should I do data scrubbing on RAID arrays on Debian/Ubuntu Linux?

Should I be doing data scrubbing? Is it redundant to do data scrubbing myself when mdadm has a cron entry on Debian and Ubuntu that does this: /etc/cron.d/mdadm 57 0 * * 0 root if [ -x ...
2
votes
1answer
73 views

Reassemble RAID 1 array from old system

I recently upgraded my OS from RHEL 5 to 6. To do so, I installed the new OS on new disks, and I want to mount the old disks. The old disks are listed as /dev/sdc and sdd in the new system, they were ...
0
votes
1answer
11 views

Is there a way to check softraid validity on OpenBSD?

I have more than two very old HDDs in a softraid(4) RAID1 mirroring discipline on OpenBSD. It looks like some of the underlying physical drives may be seeing some I/O errors; but prior to a complete ...
1
vote
2answers
66 views

Will expanding my Synology Hybrid RAID delete the data on the initial disk?

As the title states, I currently have my Synology NAS with a single 4TB drive in it. I now wish to expand this with another 4TB drive. If I expand the volume (it's currently setup as SHR) will the ...
0
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0answers
11 views

How do I update the boot environment after software mirroring a Server 2012 R2 OS Volume

I have a single physical server running Windows Server 2012 R2 My original config was a single 240Gb SSD for O/S and two larger spindles for Data storage. On installation, Windows placed 'System ...
1
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0answers
30 views

Software-RAID with ext4 but without 64bit support

last year I set up a Software-RAID5 with 5x3TB yielding 12TB of usable capacity. Just today, needing more storage, I have finished growing the RAID to two more 3TB disks: Personalities : [linear] ...
0
votes
1answer
51 views

How to copy RAID 1 HDDs from one server to another Identical server

I have one IBM X3100M4, type 2582 windows server and having 2 x 500 GB HDDs in RAID Copy. Now brought new server and having blank HDDs. How can I copy RAID HDDs from Old server to new server? I have ...
0
votes
1answer
38 views

Missing partition from RAID 0 array - what can be recovered?

System is Fedora Linux, there is RAID 0 array set up via mdadm that have bound together partitions /dev/sda4 and /dev/sdb4. Lately, /dev/sdb failed and became unreadable. Naturally, I started ...
0
votes
1answer
28 views

Raid1+0: create stripe over two /dev/mdx on partition or not?

Given that I haven't found a way to define how a Raid10 is created with mdadm, i went the Raid1+0 solution. How to display/define Mirror/Stripping pairs with mdadm mdadm --create /dev/md0 --level=1 ...
0
votes
1answer
31 views

Use old raid drive as boot device without data loss

There were two disks in sw-raid. There were /dev/md1 as swap, /dev/md2 as boot and a /dev/md3 with ext4. The sw-raid was disabled by stopping and removing mdadm and then zeroing the superblock on ...
1
vote
1answer
54 views

How to display/define Mirror/Stripping pairs with mdadm

I want to make a standard linux software Raid10 over 4 HDD. The server has 4HDDs, 2 pairs from different vendors in order to avoid batch problems. I want to have the mirror over two different ...
4
votes
2answers
281 views

What steps should I take to best attempt to recover a failed software raid5 setup?

My raid has failed, and I'm not sure what the best steps to take are in order to best attempt to recover it. I've got 4 drives in a raid5 configuration. It seems as if one has failed (sde1), but md ...
1
vote
0answers
43 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
0
votes
1answer
42 views

Redundancy: LVM+mdadm or LVM internal RAID

The task is to create LVM storage for virtual machine images. So LVM will be used in any case. There are two ways LVM providing redundancy: block mirroring lvcreate -m 1 --mirrorlog mirrored -n ...
0
votes
2answers
50 views

Transfer from RAID-1 to RAID-0 — easy as cloning?

I have a RAID-1 of 1TB drives using on-board RAID. I have 2 new 240GB SSDs I want to place in RAID-0. This is Windows Server 2012. I know with disk cloning/transferring that it is important going ...
-1
votes
2answers
228 views

What is the performance implication of hardware vs software RAID in 2-disk RAID0/RAID1 setup?

I am choosing between two similar models of servers, one of which has software RAID, while the other hardware one. Servers in question are SYS-E32-1 and SYS-E32-3 from So you Start (an OVH brand) and ...
5
votes
4answers
457 views

SW SSD Raid 1 over HW RAID 10

A provider(data center) recommended I go with 1TB SSDs in a software RAID 1 over HW RAID 10 with mechanical drives. Their quote: Typically SSDs are most reliable than RAID cards and since you ...
1
vote
2answers
57 views

Check badblocks on RAID-0

Without RAID-0, I usually check bad sectors using this command: fsck -yvckfC -E fragcheck /dev/sdX How to check bad sectors when the harddisk was using RAID-0? should I run it for each drive? ...
0
votes
0answers
28 views

Did mdadm --create destroy my data?

I think I messed up pretty bad. On my old system, I had 2 identical drive that were assembled with mdadm as a MD RAID 10 with a "far" layout. When building my new system and migrating the two disks, ...
1
vote
1answer
138 views

mdadm Stuck at rebuilding spare

I have the following Raid configuration, cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md4 : active (auto-read-only) raid5 sda5[0] sdd5[4] sdc5[2] sdb5[1] 1536 blocks ...
0
votes
1answer
80 views

CentOS System Recovery : Overwritten RAID Superblock and porting to new hardware

I have a failed system running on CentOS 6 and would like to attempt recovery of system. One problem it has is the mdadm superblock appears to have some issues, it has all sorts of inconsistent ...
0
votes
0answers
14 views

mdadm - diffference between metadata version

Can anyone tell the difference between all the metadata versions for mdadm? When I try the command mdadm --examine /dev/sda1, I can't seem to find preferred superblocks on version 1.2. Is there a ...
0
votes
0answers
79 views

Software RAID: file system becomes read-only, mdadm fails with SEGFAULT

I have software RAID1 on Ubuntu 10.10 (Linux ubuntu 2.6.35-32-generic-pae). It is dedicated server I control via SSH. Yesterday datacenter people changed one HDD which was crushed. I did not run ...
0
votes
0answers
30 views

RAID6 Ubuntu rebuild - how to calculate best parameters for fastest rebuild

I am doing a resync on a RAID6 array and I am looking at some 2 days to complete. I looked here for hints on how to speed it up, but I have, instead, managed to slow it down! HW details are: 10x 4TB ...
2
votes
3answers
86 views

awk ignores the record separator I set for the first record

I am trying to change the record separator but awk does not use the record separator I set until the second record and beyond. I get output like this: ARRAY /dev/md4 level=raid1 num-devices=2 ...
2
votes
2answers
125 views

Linux software-RAID4/RAID5 and CPU usage

In case of RAID4 or RAID5, for each stripe of data bits, a parity bit is stored. For example if I write 0 to drive A and 1 to drive B, then parity bit 1 is stored to drive C. Isn't this a huge load to ...
0
votes
1answer
57 views

Is it possible to write into RAID chunk multiple times?

As far as I know, (most) file-systems do not support one to write into file-system cluster multiple times. In other words, cluster is the smallest unit in file-system and even if a single bit of ...
1
vote
0answers
63 views

calculating optimal chunk size for Linux software-RAID

Am I correct that optimal chunk size is average file read/written to disk divided by number of block devices in RAID array storing the data? For example if the average file size is 1024KiB and I have ...
0
votes
0answers
35 views

mke2fs.ext3 stripe-width option missing

I'm trying to set up an ext3 filesystem on a RAID 6 array (with 6 disks) on XenServer 6.2 linux. All the help I can find tells me to use the -E stride=xx,stripe-width=xx options. However my version ...
2
votes
1answer
109 views

Linux; Set RAID5 chunk size to 4kB to match FS block size and physical disk sector size

There are many discussions and websites that explain the process of setting up a Linux software RAID with mdadm with the chunk size of a new RAID as 128kBs or 512Kbs. Serverfault is no exception. I ...
0
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0answers
38 views

Recovering Linux soft raid 5, disk stays as spare

I got disk failure on my Centos Linux soft raid 5 array (mdadm). I replaced one of the disk and started to rebuild the array. Next time I checked the status, the rebuild was failed. This is the ...
1
vote
0answers
60 views

Why was the replacement drive for failed drive in RAID 1 (linux software raid) was added as a spare?

I have a two drive linux software raid 1 for a server. There are two raid devices. (Boot (md0) & OS (md1)) Last week one of the drives failed so i ordered a new one. Today i shutdown the server, ...
1
vote
1answer
123 views

Linux Server OS on LVM on Software RAID: Best Practices and Considerations

I am preparing for a minimal Ubuntu Server 12.04 LTS that will simply run libvirt/KVM to host a handful of Ubuntu Server 12.04 LTS guests. On my KVM host I created a RAID 1 comprised of two physical ...
14
votes
1answer
433 views

Sanity check on 40TB server configuration

I've got 40 years in computing, but I've never had to build a server quite like this one, so this might be a n00b question. I have a client that is going to offer ultra-high def music files for ...
1
vote
4answers
187 views

Best Linux Partitioning for Multiple Resizeable HDD

My ISP has a machine with 6 HDDs (3TB+3TB+3TB+2TB+2TB+1TB) which we want to turn into a FTP/Download server for local users. I am planning to install CentOS 6.5 on one 2TB, rest of all space shall ...
1
vote
0answers
627 views

How to recover an mdadm array on Synology NAS with drive in “E” state?

Synology has a customized version the md driver and mdadm toolsets that adds a 'DriveError' flag to the rdev->flags structure in the kernel. Net effect - if you are unfortunate enough to get a array ...
0
votes
0answers
90 views

mdadm array fails to start at boot, bad superblock on component drive

At boot my mdadm raid5 array fails to start, saying that one of my disks (sdi) has a bad superblock. However, once I log in, I can start the array no problem with mdadm --assemble /dev/md0 ...
0
votes
1answer
117 views

Mixing SATA & SAS drives on same server for software raid

Is it possible to mix SATA and SAS drives on the same controller? These are intended to be used these in server 2012 R2 software raid, obviously not mixed in the same array but maybe on the same ...
-4
votes
1answer
66 views

raid 1 always degraded after pushing reset [closed]

I have Marvell hardware raid 1. After pushing reset or any other incorrect shutdown raid is degraded. Is it possible to create hardware raid 1 on other chips(intel chipset for example) for example ...
0
votes
3answers
219 views

mdadm raid6 built, but no mounting or fsck

I had some problems with my RAID 6 drive on mdadm recently. No LVM in between. Two drives died, and were pulled out while the machine was powered down. Now, I boot up the system, and cannot mount the ...
-1
votes
3answers
400 views

Turn off RAID on HP DL380? [duplicate]

Can anyone tell me how I can turn RAID off on a DL380-G5. I just want the disks connected directly without any RAID as I want to use this to test Microsoft's software RAID. Can't seem to find ...
3
votes
3answers
120 views

Linux MD RAID resilience in situations with unpredictable power

If you were given a situation where you MUST use RAID for reasons outside of your control and the server with the RAID may not be on a battery backup and the building is prone to power loss, what are ...
1
vote
1answer
53 views

retrieve software RAID information using WMI [duplicate]

I need to get software RAID configuration info from a remote windows server (2003, 2008, 2012) on a local linux system. I have searched and searched, but have been unsuccessful at finding a solution, ...
-3
votes
1answer
59 views

What are the pros/cons of software raid made up disk connected over SATA and others over USB? [closed]

I would like to use RAID1 with 1 SATA disk and 2 USB disks PS: This is an ARM board (cubietruck) with only 1 SATA port and 2 USB ports. PS2: The OS boots from a SD card :) PS3: The setup does not ...
2
votes
1answer
32 views

Mirroring System Drive On Server 2008

I have server 2008 installed on a hard drive that disc management calls a "basic volume." On this hard drive I have partitions configured for certain sets of data. I want to buy a second hard drive ...
3
votes
1answer
87 views

RAID-5 array being split on reboot (ubuntu)

I've set up a RAID-5 array on Ubuntu 13.04 (kernel 3.8.0-27-generic) using mdadm - v3.2.5 - 18th May 2012. It appears to work fine and be in high spirits: $ cat /proc/mdstat Personalities : ...
2
votes
0answers
162 views

Restore LVM if VG is not consistent (XenServer 5.6.1)

i have a VG that uses the PVs /dev/md1 and /dev/md2. Now one hdd failed in /dev/md1: [root@xenserver1 ~]# cat /proc/mdstat Personalities : [raid1] md1 : active raid1 sda3[0] 382320128 blocks ...
0
votes
1answer
202 views

Can I use a RAID card with chipset SIL3124 with no driver?

I have a software RAID card with a SIL3124 chipset. (This one). As you configure the RAID via BIOS, is it possible to use this card with 3 disks (RAID 5) with any OS without installing any driver on ...
0
votes
0answers
622 views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
0
votes
1answer
28 views

mdadm grow operation giving nonstop libata errors

Running Debian 7, mdadm 3.2.5. I issued a command to grow a 5 disk, 3 spare raid 5 array to an 8 disk, 0 spare raid 6 array: mdadm --grow /dev/md0 --level=6 --raid-devices=8 ...