The Unix Code

~ Collaboration Of Code and Processes
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How do I configure RAID 5, especially stripe size, with 24 x 1.2 TB drives for CentOS 6?

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For a Dell R920 with 24 x 1.2TB disks (and 1TB RAM), I’m looking to set up a RAID 5 configuration for fast IO. The server will be used to host KVM VMs that will be reading/writing files of all sizes, including very large files. I am not terribly interested in data safety because if […]

Published under: Linux, Storage

Nov 29, 2014J Dawg
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How to recover a crashed Linux md RAID5 array?

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Some time ago I had a RAID5 system at home. One of the 4 disks failed but after removing and putting it back it seemed to be OK so I started a resync. When it finished I realized, to my horror, that 3 out of 4 disks failed. However I don’t believe that’s possible. There […]

Published under: Linux, Storage

May 26, 2013J Dawg
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Pros and cons of software Parity-RAID (e.g. RAID5)

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I was recently told about some problems concerning Parity-RAIDs without a non-volatile cache. More exspensive HW-controllers do have battery-powered caches to finish write-operations in case of power failure. Now, some people say that such a failure, perhaps in combination with a degraded array, may kill your whole filesystem. Others claim that those issues are outdated […]

Published under: Storage

May 26, 2013J Dawg