search for: mdraid

Is it possible or will there be any problems with using mdraid on top of mdraid? specifically say mdraid 1/5 on top of mdraid multipath. e.g. 4 storage machines exporting iSCSI targets via two different physical network switches then use multipath to create md block devices then use mdraid on these md block devices The purpose being the storage array survi...

Hey, I installed 2 new data servers with a big (12TB) RAID6 mdraid. I formated the whole arrays with bad blocks checks. One server is moderately used (nfs on one md), while the other not. One week later, after the raid-check from cron, I get on both servers a few block_mismatch... 1976162368 on the used one and a tiny bit less on the other...? That seems a t...

Can I combine VMWare ESXi (free version) virtualization and CentOS mdraid level 1? Any pointers how to do it? I never used VMWare before. - Jussi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi at greenspot.fi * http://www.greenspot.fi

There are some errors on my root filesystem, so I need to fsck it. In order to do this while the filesystem is unmounted, I'm booting from the install disk. However, since the filesystem is on an mdraid device, I'm not sure of the right way to get it assembled so I can check it. If I do, mdadm --examine --scan, then I get this: ARRAY /dev/md/2 metadata=... (and others, but I'm only interested in md2 at this point) It shows as /dev/md/2, while it is called /dev/md2 if I boot into the OS...

So I'm curious how SAS JBOD arrays and linux MDraid as implemented in CentOS6, and SES (SCSI/SAS Enclosure Services) backplane controllers 'get along' and how much configuration is needed to get the warning lights to work properly. scenario: whitebox server with a SAS backplane or two, daisy chained on a SAS HBA (like an LSI Logic 200...

Hi, I am trying to adapt my kickstart usb key to optionally auto-setup mdraid on two disks...? But I have one server that keeps attaching the usb key to sda instead of sdc... My kickstart creates the raid devices on sdb and sdc partitions; but then I expect it not to work once the key is unplugged and the disks fall back to sda and sdb... Can I just modify mdadm.co...

...m fat32 EFI-part 2) part2 8gb raid swap 3) part3 ~500gb raid / then I've cloned gpt of sda to sdb without problem. Then I've created array md0 for swap and md1 for / and then rebooted the system. I've started installation process. During disk selection I get only one disk tagged as MDRAID disk and not sda and sdb. Selecting MDRAID disk I can't see sda1 sdb1 EFI-part, md0 and md1 devices. Going to console, cat /proc/mdstat give me only md1. If I try to start md0 mdadm says sda2: not such file or directory but the partition exists on /dev/sda. Coming back to Installer, it for...

...be useful? > Follow-up question: Is my proposed strategy below correct: - Make a copy of all existing directories and files on the current disk using clonezilla. - Install the new M.2 SSDs. - Partitioning the new SSDs for RAID1 using an external tool. - Doing a minimal installation of C7 and mdraid. - If choosing three RAID partitions, one for /boot, one for /boot/efi and the third one for the rest, do I go with the default mdraid version, ie 1.2 I believe? - Copying the backup above with contents of the the existing disks, ie not just /root and /home but all other directories and files to...

On Sat, Feb 28, 2015 at 5:14 PM, Chris Murphy <lists at colorremedies.com> wrote: > "Drives, and hardware RAID cards are subject to firmware bugs, just as > we have software bugs in the kernel." makes no assessment of how > common such bugs are relative to each other. I don't want to underestimate the value of good hardware RAID with BBWC implementations when it comes

I am trying to use a kickstart to install CentOS 8.2 on a server with a pair of drives with Linux software RAID 1. The install completes, but the resulting system will not boot - I get "Booting from Hard drive C:" from the BIOS (Dell in legacy BIOS mode, not UEFI) and it stops. If I then start the installer in rescue mode and run grub2-install on the two drives, it boots okay. If I

On 11/15/20 3:32 AM, ?ukasz Posadowski wrote: > Do anyone can suggest what else I forgot to do? Use metadata version 1.2 instead of 0.9. You need for the filesystem to be not visible until after the RAID is assembled, and the easiest way to do that is to put the metadata at the beginning of the drive and the partition table inside the RAID volume. With metadata version 0.9, the partition

In article <20201115123245.db62b8248e1f248afe02844a at lukaszposadowski.pl>, Lukasz Posadowski <mail at lukaszposadowski.pl> wrote: > > Hello everyone. > > I'm trying to install CentOS 8 with root and swap partitions on > software raid. The plan is: > - create md0 raid level 1 with 2 hard drives: /dev/sda and /dev/sdb, > using Linux Rscue CD, > - install

On 11/15/20 10:40 PM, ?ukasz Posadowski wrote: > Sun, 15 Nov 2020 14:16:48 -0800 Gordon Messmer <gordon.messmer at gmail.com>: > > >> Use metadata version 1.2 instead of 0.9. >> > Thanks, I'll try that. I'm use to metadata 0.9, because GRUB have > (had?) some issue with the newer ones. If that doesn't work, and you need to use metadata 0.9, then

Something seems to be wrong with my file systems, and I want to fsck everything. But I cannot. The setup consists of 2 hds, carrying 3 raid1 (ext3) file systems (boot, /, swap). OS is up-to-date CentOS 5. So I boot from CentOS 5.3 dvd in rescue mode, do not mount the file systems, and try to run fsck -y /dev/md0 fsck -y /dev/md1 fsck -y /dev/md2 For each try I get an error message:

I have a raid1 array which is somehow faulty. There is 1,5 TB of stuff, I would not want to lose it (though I have full backup). The array cannot be mounted on startup (error message was "missing superblock"). I had to boot from DVD with linux rescue and remove the array from fstab. Here is some info - I am a little dumbfounded. [root at a134-224 log]# cat /proc/mdstat (...) md5 :

Sun, 15 Nov 2020 14:16:48 -0800 Gordon Messmer <gordon.messmer at gmail.com>: > On 11/15/20 3:32 AM, ?ukasz Posadowski wrote: > > Do anyone can suggest what else I forgot to do? > > > Use metadata version 1.2 instead of 0.9. > > You need for the filesystem to be not visible until after the RAID is > assembled, and the easiest way to do that is to put the

Hi list, I'm building a backup server for 3 hosts (1 workstation, 2 server). I will use bacula to perform backups. The backup is performed on disks (2 x 3TB on mdraid mirror) and for each hosts I've created a logical volume with related size. This 3 hosts have different data size with different disk change rate. Each host must have a limited sized resource and a reserved space. If a server needs more space to perform backup, It must be enabled and provi...

Hello, Just a couple questions regarding RAID. Here's thesituation. I bought a 4TB drive before I upgraded from 6.8 to 7.3. I'm not too far into this that Ican't start over. I wanted disk space to backup 3 other machines. I way overestimated what I needed for full, incremental and image backups with UrBackup.I've used less than 1TB so far. I would like to add an additional drive

...xperienced this problem with hard disk management before and cannot explain it to myself on any rational basis. The setup: I have a workstation for testing, running latest CentOS 7.3 AMD64. I am evaluating oVirt and a storage-ha as part of my bachelors thesis. I have already been running a RAID1 (mdraid, lvm2) for the system and some oVirt 4.1 testing. Now I added 6x 500 GB platters from an old server running Debian 8 Jessie with software RAID of a similar fashion as well. That would unexpectably prevent the system from booting past something like (I copied it from the working setup), I ran it ove...

...D drivers to bind to it instead. There are no Linux drivers > that bind to the "RAID" mode PCI ID, though if you switch the > controller to "standard" mode, Linux drivers will work normally. > > https://mjg59.dreamwidth.org/44694.html?thread=1749398 I thought the mdraid software raid drivers supported the intel RST (formerly Matrix) fake raid ? the major difference is, with RST/Matrix, the whole disk has to be mirrored then partitioned, while mdraid normally does mirroring on a per partition basis. the other difference is the raid metadata block, but I though...