Mdadm is a free and open source gnulinux utility used to manage and monitor software raid devices. Disk partitions devhda1 and devhdc1 will be used as the members of the raid array md0, which will be mounted on the home partition. Hello, i have been working on this problem for quite some time and i think i got to a point where i am stuck. First of all, make sure mdadm is present in the linux box. How to set up software raid 1 on an existing linux. I need to use software raid to create a raid 5 array with them. The cause of this issue can be that the device mappermultipath or other device mapper modules has control over this device, therefore mdadm cannot access it.
If force worked the backup would still be at risk of being inconsistent as some older writes to the device may not have finished and new writes may occur. The example below shows how to create a software raid1 array on debian systems. Disk partitions devhda1 and devhdc1 will be used as the members of the raid array md0, which will be mounted on the home partition install the mdadm package. Mdadm download apk, deb, eopkg, ipk, rpm, tgz, txz, xz. If namesyes is given in nf then mdadm will use a name when appropriate.
This allows multiple devices typically disk drives or partitions thereof to be combined into a single device to hold for example a single. One of the changes is to now use remote storage over iscsi rather than fibrechannel directly attached storage. To automatically mount the raid 1 logical drive on boot time, add an entry in etcfstab file like below. I installed mdadm fine and all and proceeded to run. Found 2 matching packages exact hits package mdadm. This package automatically configures mdadm to assemble arrays during the system startup process. To make mdadm find your array edit etcnf and correct the numdevices information of your array.
The tool used in linux to create software raid is mdadm. Download mdadm packages for alpine, alt linux, arch linux, centos, debian, fedora, kaos, mageia, openmandriva, opensuse, openwrt, pclinuxos, slackware, solus, ubuntu. Run the tests to the end, even if one or more tests fail. Hi, we use serviceguard on linux on proliants with mirrored san devices.
When trying to readd a device to a raid, you get the following message. The tool you want is lsof, which stands for list open files it has a lot of options, so check the man page, but if you want to see all open files under a directory. The cause of this issue can be that the devicemappermultipath or other devicemapper modules has control over this device, therefore mdadm cannot access it. How to manage software raids in linux with mdadm tool. We will be resizing sda1 first, so we need to fail it and remove it from the raid. Cannot set device size for devmd2 device or resource busy check these commands are just example. The disk mirroring can be simulated in a software environment. Introduction to mdadm the mdadm package contains administration tools for software raid this package is known to build and work properly using an lfs9. This command will typically go in a system startup file. You have searched for packages that names contain mdadm in all suites, all sections, and all architectures. Today ill show you how to build a raspberry pi 3 raid nas server using usb flash drives and the linux native raid application mdadm, along with samba so the drive will show up as a normal network folder on windows pcs. Debian debian 5 mdadm device or resource busy raid. The command dmsetup table will show that this devices is controlled by the devicemapper see man dmsetup for more detailed information. The md device is given on the command line, is found listed in the config file, or can be deduced from the array identity.
It is used to configure raid disks and present to the linux kernel as a block device. At first i didnt think it was an issue with my command because after sometime the mdadm command i was using seemed to work. Its an intermediate tutorial and shows you how to create a linux raid array which is a good skill to have. The array identity is determined either from the uuid, name, or superminor commandline arguments, from the config file, or from the first component. I am trying to set up a mdadm raid in a new machine that i am building as a home theatre pc. Google reported that dmraid is a possible culprit but trying to remove it shows it is not installed. I installed ubuntuserver 64bit with no flaws, went very fast actually.
Debian mdadm maintainers mail archive michael tokarev. Device boot start end blocks id system dev sda1 1 996 7993344 83 linux. Software raid 5 in ubuntudebian with mdadm 9 min read. Apr 27, 2018 these can be found in a number of ways. Device or resource busy errors when setting up a raid array. The following is the output of mda examine for all 3 disks i think it should be 3x raid1 disks. A minimal initramfs for assembling md arrays can be created using three files and one directory. So i decided to coldboot the laptop in mid download. Centos, debian, dmsetup, freebsd, mdadm, operating systems, oracle, soft, ubuntu procmdstat, cannot open, device or resource busy, dmsetup, mdadm, mdadm devmd1 manage add devsdb1, mdadm. This optional target creates extra programs, particularly a staticallylinked version of mdadm and also versions of mdassemble. Device or resource busy errors when setting up a raid. Device or resource busy dmraid i pointed as the usual problem but its not even installed. This happens because if there is no raid configuration information in the mdadm. Graphical user interface to create and maintaining mdadm software raid arrays.
Build a raspberry pi raid nas server complete diy guide. Trying to assemble the array now, mdadm keeps reporting device or resource busy and yet its not mounted or busy with anything to my knowledge. After mdadm finished growing the array it does not automatically modify etcnf. Note that if you omit the manage option, mdadm assumes management mode anyway.
Starting an raid1 device in degraded mode, so we can mount and copy files out. Dec 15, 2014 mdadm is an open source, small, fast and free commandline utility implemented in c and designed for maintaining, creating, and monitoring linux md device arrays, popularly known as software raid. Then format the filesystem on the new array volume and copy all data from devsda1. Ubuntu developers mail archive please consider filing a bug or asking a question via launchpad before contacting the maintainer directly. Jun 11, 2011 debian debian 5 mdadm device or resource busy raid.
Whereas the mdstat command indicates that the device is inactive. How to manage software raids in linux with mdadm tool part 9. You may want to use the xgvfsshow option, will let you see your raid1 in the sidebar of your file manager. Device or resource busy when using mdadm righteous hack. Therefore you will realize that mdadm will not find the grown device devmd1. Mariano cediel mdadm finished growing the array it does not automatically modify etc mdadm. The mdadm utility can be used to create, manage, and monitor md multidisk arrays for software raid or multipath io. Trying to build a raid 1 with a device that is mounted, mdadm says device or resource busy, even with force. Software raid 5 in ubuntudebian with mdadm zack reed. Open gparted and resize the sda1 partition to its new. If namesno is given, then nonnumeric md device names will not be used even if the default changes in a future release of mdadm. Hi all, i have recently set up a new system to replace my old server. The command dmsetup table will show that this devices is controlled by the device mapper see man dmsetup for more detailed information. I hope you also realised that the old contents will be wiped in the process, so you might want to create a new array with one device missing use mdadm level10 raiddevices8 missing devsdb1 devsdc1 devsdd1 devsde1 devsdf1 devsdg1 devsdh1.10 993 1459 556 337 1211 104 483 1101 911 1511 470 142 951 853 1292 1395 795 113 402 310 1195 1478 486 1423 549 1482 1005 235 437 1266 1036 1525 1306 591 965 221 995 1158 646 653 593 1133 1284 616 277 1299