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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 […]
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Welters Helpful Unix Administrative Scripts

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Over the years I have used many scripts to perform various tasks. Some of those scripts came from the-welters website. Here you will find some great perl scripts to perform such tasks like display Cisco CDP packets to performing symaccess commands on EMC storage arrays. These scripts are distributed under standard GNU Public License terms. […]
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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 […]
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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 Others claim that those issues are outdated […]