Questions tagged [raid1]
RAID 1 or Mirrored RAID uses two or more disks that store the same data.
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While RAID1 is resyncing after create, can i write files to it immediately?
I searched but i just found this.
How to interrupt software raid resync?
My question is
can i write files to my raid1 device while...
[root@centos ~]# cat /proc/mdstat
Personalities : [raid1]
...
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Can't get my RAID array out of degraded mode
I've got a 4-drive RAID 10 array that has just had a drive failure. I ignorantly have never practiced how to recover from a failure (I'm a programmer, just keeping this server as a hobbyist) so I'm ...
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RAID1 performance with madam
I am looking into performance issues we are having.
We currently have a 4 drive RAID5 (3+1 fail over) and read performance sucks.
Looking at RAID1 with 2 drives (maybe more, any benefit?) but from ...
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How to Resize RAID partitions on Ubuntu Server 16.04
Recently we configured an Ubuntu 16.04 on Server. We have two 256 GBs SSDs. After a while we recognised that our main RAID partition has only 20GBs while other partition has more than 200GBs.
Here's ...
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If two members of a RAID 1 volume have inconsistent bits, how do most RAID controller handle this?
I am using VROC for CPU RAID with some NVMe drives. I have a RAID 1 array that seems to be having problems. Instead of boring you with the details, I have a more general question.
How does VROC (or ...
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Write-read errors, Raid1 recovery?
This might sound stupid, but I'm supposed to ask any question here, as long as it is related.
So here. I have RAID 1 on the server that is officially soon to be dead. After a chkdsk, the files are ...
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mdadm: power failure during raid1 rebuild
RAID1 array created with mdadm; array was rebuilding when there was a power failure. On coming back up, the array seems to be dead.
# cat /proc/mdstat
Personalities : [raid1]
md0 : inactive sdb1[2](S) ...
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Hardware RAID1 configuration - Possibly failed sectors on one physical disk. Does the OS automatically read from the other disk?
I'm not a professional sysadmin but since I couldn't find answers to my specific case after researching for a while I was hoping I could get some help here. Our server uses P222 - a HP Smart ...
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RAID 10 or RAID 1 x 2 for Hyper-V with AD, EXCHANGE on Windows 2008 R2
We have 2 servers which have 6 SATA 7200 disks inside (each). We want to configure both servers so that they will have Window Server 2008 R2 Enterprise installed and on top of it Exchange 2010 x2 (for ...
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Ubuntu: Monitor hardware RAID and notify upon failure?
I am using the 3ware 9650SE-2LP Raid controller for a 2-drive RAID 1 setup in some new Ubuntu 10.04 x64 servers.
Is there a way for the server to send me a notification when one of the drives fails? ...
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3-way RAID 1 vs. 2-way RAID 1 + hot spare
Assuming the following parameters for a new server storage configuration:
All drives are SSD
Few large drives are preferred over many small drives
RAID 1/mirroring is preferred over RAID 5/6/parity
A ...
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LVM Raid 1 + SSD Caching
I have three disks:
/dev/sda slow hdd
/dev/sdb slow hdd
/dev/sdc fast ssd
/dev/vg0 volume group consisting /dev/sd{a,b,c}
Each logical volume (lv) should be raid1 mirrored and ssd cached.
With the ...
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Monitoring HP Smartarray (cciss) with nagios
I'm trying to monitor an HP Smart Array controller using nagios. I have 4 disks on 2 RAID1 arrays, so 2 disks per RAID1.
I installed nrpe-server and nrpe-plugins and I'm using the almighty check_raid ...
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Very slow write performance on Debian 6.0 (AMD64) with DMCRYPT/LVM/RAID1
I'm seeing very strange performance characteristics on one of my servers. This server is running a simple two-disk software-RAID1 setup with LVM spanning /dev/md0. One of the logical volumes /dev/vg0/...
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TRIM issues with software RAID1 (mdadm) on two different SSDs (size and manufacturer)
I plan to do a server with 2 SSDs in RAID1 (for OS and boot) and 3 HDDs in RAID5 (for data). All Linux (CentOS7) with mdadm.
We have in the office 2 leftover SSDs, but they are from different ...
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Linux RAID mdadm: what does 'Events' mean?
When I type
mdadm --detail /dev/md0
I get a lots of useful information most of which I understand. However I also get a line that reads:
Events : 0.710
Where the number varies.
Naively, I ...
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Sync SSD to spindle drive using RAID or DRBD
I'm setting up a server with and SSD as the primary drive, and would like to duplicate the data onto a cheaper drive as a block-level backup (à la RAID1).
Since I don't want to hobble the performance ...
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Should "System" chunks be included in a btrfs RAID1 balance?
The btrfs wiki RAID1 conversion example gives the following command:
btrfs balance start -dconvert=raid1 -mconvert=raid1 /mnt
There is also the option -s which `man btrfs-balance page defines as:
...
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Bad sector on disk, part of a LVM over RAID1 array, which files are affected?
My RAID1 array /dev/md1 is rebuilding after one of the disks has been replaced.
Problem : the source disk has Unrecoverable Errors, and my only choice if I do not want to lose the whole data set (no ...
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MD RAID 1 with external bitmap doesn't fully resync
I have an interesting configuration: dual boot system with a RAID 1 that needs to be visible in both Windows and Linux. The Windows install is Win 7 Enterprise, and the Linux install is Kubuntu 10.04. ...
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Different RAID settings for different folders on the same logical drive
I have a NAS drive that shares files on my local network. I attached the logical drive letter X on my Windows 7 computer to this sharing. I am thinking of purchasing additional hard drives and setting ...
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CentOS - hardware raid 1 of two drives not being treated as single drive by fdisk
I am a bit new to hardware configuration in general, much less with linux, so please give me a little slack :)
I have the following setup: 1 320GB Drive that contains the OS (centOS) and 2 250GB ...
user30130
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Can mdadm convert a RAID5 to a RAID1?
I have a RAID5 consisting of 3 disks, one of which is broken. I was wondering if it is possible to convert those two disks to a RAID1 without data loss and without having to back-up the data elsewhere....
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Is it possible to recover data from an Intel PERC H710 Adapter RAID Controller disks into another server with SAS controller
I have a Dell T420 server with a PERC H710 Adapter RAID Controller. I had a RAID 1 with two hard drives. And another disk into the same controller, with no RAID only for backup.
The Motherboard of ...
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RAID 1 - IOPS Write Penalty 1 or 2
I keep seeing articles describing the RAID IOPS write penalty for RAID 1 (and RAID 10) as 2.
RAID 0 would have a penalty of 1, of course, since every write is simply written to disk. RAID 1 is ...
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Remake SW RAID1 from a new HDD and an old HDD with bad blocks
I have a SW RAID1 and I just replaced /dev/sda with a new HDD as the old one failed.
Now, upon trying to recreate the RAID array I discovered that the "good" HDD (/dev/sdb) has bad blocks with prevent ...
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Extracting data from a RAID 1 array with out original controller
A Dell x346 server crashed (motherboard went bad) and I need to get a few files off of the hard drive. They are 2 SCSI hard drives in RAID 1. As far as I know both drives are fine.
Can I just put one ...
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Can I keep the data on my Raid 1 drives if I move them to a new Raid controller?
I have a couple of servers I'm about to decommission and they each have 2 raid 1 drives. I want to take these drives and put them in a DAS but I am told that I will lose the data because the raid ...
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On-board RAID-1 or Software RAID on SUPERMICRO MBD-X7SBE Asterisk Heavy Use?
I am looking using the on-board RAID controller of my SUPERMICRO MBD-X7SBE to setup a RAID-1 array with two Seagate ES2 hard disk drives. We have around 8 or so of these in production. I am going to ...
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mdadm - RAIDs of partitions or partitions of RAID?
If using entire drives for an mdadm RAID which will be the boot device as well, is it more correct / standard to:
1) Configure the RAID out of partitions that encompass the whole drive (like /dev/...
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RAID 1 Failover
Given two disks in a (hardware) RAID 1 configuration, what exactly happens to a production system when one drive fails?
Is there any noticeable service interruption, or will the system continue ...
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Remove dead HD in Raid1?
I am on debian, raid1, one of the drives seems dead.
root@rescue ~ # cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda2[0]
486279424 blocks [2/1] [U_]
md0 : active raid1 sda1[0] ...
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What is the risk of putting a RAID superblock at the end of a device?
I want to set up a RAID 1 array using mdadm to store backups (I'll be using rsnapshot to do the actual backups). I've read that using metadata 0.9 or 1.0 format with RAID 1 is advantageous because ...
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Add btrfs devices to raid1 array, increasing total size
I have a btrfs array comprising of two 2TB disks in raid 1. I am running out of space, and I want to add two 3TB disks that I have lying around. The final setup will be 2x2TB+2x3TB drives. One drive ...
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Windows Server 2012 Raid 1
I have a question that might seem like a very basic or noob question but here it goes.
Quick back story: Our company has an HP server that holds the databases etc for our POS PC / Cash Registers. The ...
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md raid1 reading from one disk only
I have two identical HDD in a linux software raid 1. I observed a mostly reading load on this raid device, with the process showing mostly iowait. iotop shows about 75% disk utilisation overall.
If I ...
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RAID1: One RAID per Partition or Partitions on RAID device?
What is better suited for a normal Server:
several partitions, which are bundled as several RAID1 devices (/dev/md0, /dev/md1, ...) without any partitions, which are not mirrored.
one big /dev/md0, ...
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Linux Software RAID1 Rebuild Completes, but after reboot, its degraded again
I have been beating my head with an issue here, and I'm now turning to the internet for help.
I have a system running Mandrake Linux, with the following configuration:
/dev/hda - This is a IDE drive....
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Raid 1 default disk capacity is lesser than the disk sizes. Any ideas? Intel Raid Storage Technology - Raid from Bios
Here the screenshots I think they explains everything
The disks are advertised as 1 TB and the real size of the disks are 931.5 GB
I have installed windows server without raid setup for ...
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On Ubuntu, how do you recover data from a single disk of a raid array from another device
I have a 2 disk NAS device using RAID 1 mirroring. When disks started failing I wanted to buy bigger disks so as to upgrade the volume size. However the device couldn't handle mirroring the original ...
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HP DL320e Gen8, 3TB drives, Windows Server 2012 R2 - HDD full capacity alocation difficulties during installation
One interesting task to do but not so easy as i thought.
The server is HP DL320e gen8, The main difficulty is with partitioning the RAID1 (2x3TB HDDs) during the installation on 2 partitions (System =...
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How to move RAID 1 to RAID 1+0
I have two HP disks in RAID 1 (300 Gb), and would like to at 2 additional disks in RAID 1+0 having in total of 600 Gb on C:.
I would like to know is it possible to do it using Array Configuration ...
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ZFS: 3 devices: what's the difference between mirror and raidz2?
It would seem like with 3 devices, it's possible to configure a ZFS pool with either mirror or raidz2 mode.
What's the difference in performance and reliability?
(In regards to reliability, I'm ...
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Can I move an entire software RAID1 array containing Linux to another machine?
I want to move an entire array of drives from old server hardware to new server hardware. There are 3 SATA drives with two partitions each; a small boot partition and a data partition. There are two ...
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How can I increase the size of a RAID array on the fly?
Right now we have RAID 1 running on 2 1TB hard drives. They are nearly full so I would like to replace them with a 2 TB drive. Is there a master/slave with RAID 1? Am I able to just pull one of the ...
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Hot swapping under RAID 1
I have a server that supports hot swapping (such as HP ProLiant DL160 G6 with hot swap) (spec) and I configure it for RAID 1 mirroring across 2 disks.
Say one of the raid'ed disks then fails. Can I ...
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When two different companies of hard disks can be raid together? [closed]
I'm trying to replace the hard disk due to the aging of the server computer. Currently, the server computer is composed of two 2tb hard disks as RAID 1. The model number of the hard disk is Seagate's ...
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Trouble Installing Ubuntu Server on PowerEdge R330 (Hardware RAID1)
I'm having trouble installing Ubuntu Server 16.04 LTS on a hardware RAID-1 setup on a new Dell PowerEdge R330 Server.
I'm using a bootable USB made by Rufus-2.18.
(I'm a newb to server setups, so ...
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Data scrubbing and repairing a RAID1 mirror?
In Linux, if I have a software RAID1 mirror /dev/md1 with N ≥ 1 active devices, what are the semantics of the repair command?
echo "repair" >/sys/block/md1/md/sync_action
Am I correct to ...
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Unable to remove the software raid-1 array when it is in degraded state
I want to remove the software raid-1 array [ when it is degraded state] configured on LVM in linux system and unable to remove the same. I have even tried using Knoppix Live CD to remove the RAID-1 ...
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