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Questions tagged [md]

Multiple Device driver aka Linux Software RAID

77 questions
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Force server to use all resources for resync

I need to resync my RAID and noticed that it isn't a big consumer. I have booted my system with the Rescue CD and started the resync. Looking at top it seems that the processes doesn't take much resources. Can I force the mdadm to use ALL resources…
CSchulz
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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] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]…
Frederic Beister
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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 Vendors, and then the Stripe over the mirror pairs. I…
Chris
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SSD+MDRAID+LVM+KVM results in lower performance than expected

We use kvm for virtualization, the disk images are stored as logical volumes. The logical volumes are stored on a bunch of software-RAID1 (mdadm) arrays composed of Intel DCS3500 SSDs (each array is a physical volume in the volume group). If I…
Pentium100
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Remove a duplicate lvm physical volume uuid?

After upgrading a rhel 5 server today I rebooted to the new kernel: curr=2.6.18-371.el5PAE prev=2.6.18-348.18.1.el5PAE. In the boot sequence I saw a message indicating Logical Volume Management was starting and then almost immediately I saw this and…
Jeff Holt
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Slow software raid with SSDs

We have moved a web application with an Oracle database to a new server because the old one was dying. The old server had two mirrored hard discs plus a separate non-mirrored SSD for the Oracle datafiles (without redo and undo log). The new server…
Codo
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Is there anything I can do with a software RAID 1 on linux to workaround temporary 'bad' sectors?

Basically I have two identical hard disks that are in perfect working order, they just don't have the vibration tolerance they need for the environment they are in. (I am making an educated guess that this is the cause). The disks are in RAID 1…
Dark
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Fresh setup: how to tell mdadm not to bother synchronizing the _data_? Or does it have to?

Two questions: how, if at all, can I tell mdadm that the freshly created array needs no synchronizing because there is no data on it? I.e. basically force it into a state where it assumes that the "data" (i.e. the vast empty space) is synchronized…
0xC0000022L
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What should I know before I set up RAID 6 on Linux?

I just ordered five 1TB drives to install as a RAID 6 array in a Linux server (keeping the existing 1TB drive as a boot disk). I want to use Linux MD for RAID rather than a RAID card, to avoid lock-in. The intended use is for storing filesystems for…
Isvara
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Erratic write patterns with linux md RAID1

I'm experiencing strange write performance patterns on a RAID1 array of SATA disks. My kernel is vanilla 2.6.37 and my server has 32G RAM. I'm copying a 32G file from an XFS filesystem on a SAS drive to an ext3 filesystem over a (md) RAID1 of SATA…
Patrick LeBoutillier
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Combining Dell MD SAN with HP MSA60 DSA?

Would it be possible to combine a Dell MD SAN with a HP MSA60 DSA, or am I forced to use it with other HP StorageWorks products? The MSA60 spec reads: Storage expansion: Supports 1+3 cascading off single x4 SAS port Host interface: 3 Gb/sec SAS
3molo
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Recover BTRFS? bad magic on superblock on /dev/md2

so after a recent power outage my DS718+ RAID crashed. After investigation with Syno Support we also identified that my RAM was broken (already removed) and as it was not a officially supported RAM module they now will no longer help me with…
UnrealSlimShady
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CentOS7 GPU cluster, expanding partition volume

I have a question. I'm trying to increase the disk partition to more than 50G, which I recall was the default given by CentOS7 during installation. I'm wondering how to go about doing so, since I have this as a raid0 setup. And I obviously don't…
Ming Lee
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raid0 (soft-RAID using Linux md drivers) hosting XFS: how to repair after replacing bad disk?

So the latest configuration of our Nova compute nodes are using raw /dev/sdX devices (no labels nor partitions) as components for an md0 (raid0) array on which they're hosting an XFS filesystem. When one of the underlying hard disks fail, then the…
Jim Dennis
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Can I convert a single-disk system to software RAID1 without double-copying?

I have read this question: Can I create a "soft" RAID1 array without nuking data? as well as many other tutorials that layout this general process: Create degraded RAID1 array on new drive Copy over data to new drive Add the old drive to the array,…
Shelvacu
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