Multiple Device driver aka Linux Software RAID

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2answers
368 views

how to get block sizes larger than 4k in reads from an md raid1 volume

I wanted to setup a raid01 configuration (a raid1 composed of two raid0s) with one of the raid0 volumes having the write-mostly state set so all reads would go to the other (i.e. one is disk, the ...
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1answer
572 views

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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1answer
160 views

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 ...
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1answer
101 views

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 ...
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0answers
305 views

MD Raid can't be assembled

I was running a Raid5 with 3 disks at on my homeserver. But had some problems with the back-plane for the disks. The disks weren't detected reliable. So I replaced the back plane and the disks are now ...
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0answers
7 views

reusing existing raids on preseeded instalation

I'm trying to automate reinstall process of existing ubuntu installation. partition layout : md0( raid1, /dev/sda1#/dev/sdb1 ) - swap (2G) md1( raid1, /dev/sda2#/dev/sdb2 ) - / (20G) md2( raid1, ...
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0answers
58 views

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 ...
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0answers
103 views

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 ...
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10 views

md raid 10 - size od resulting raid

https://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10 near 2 copies configurationod md raid 10: 2 drives 3 drives -------- ---------- A1 A1 ...
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77 views

What chunks are mismatched in a Linux md array?

After performing a "check" (by writing check to /sys/class/block/md0/md/sync_action) of a md software RAID array with redundancy on Linux, the md subsystem will update the ...
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859 views

Can't mount logical volume, RAID/MD/LVM problems

I have a file server with 48 2TB HDDs split across 2x 3ware 9650SE-24M8 RAID cards. Both cards have 24 drives in RAID 1+0. MD softraid is setup in raid 0 with the two RAID 1+0s making RAID 100. LVM2 ...
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474 views

Rebuilt md raid 6 array now showing xfs errors. How bad is it?

We had a storage server with performance starting to be poor. When I installed Linux's smartutils, it found Device: /dev/sdm, 2 Offline uncorrectable sectors Since this was a rather large raid6 ...