Why RAID 1, 5 and 10 will kill you some day
How important is availability of an information system to you and your company? What are the costs of, let's say, a couple of hours downtime and maybe the loss of all the work since the last backup?...
View ArticleCalculating EXT2 EXT3 EXT4 stride size when using RAID
When formatting a RAID device with an EXT filesystem, it is always advised to specify a stride size. The format utility will take this stride size into account when formatting a device. The stride size...
View ArticleScript that shows ETA of RAID rebuild / reshape
I made a small script that converts the output of cat /proc/mdstat to an actual date and time telling you when the RAID rebuild / reshape is finished.This is the link to the correct version of the...
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'Linux RAID level and chunk size: the benchmarks'
IntroductionWhen configuring a Linux RAID array, the chunk size needs to get chosen. But what is the chunk size?When you write data to a RAID array that implements striping (level 0, 5, 6, 10 and so...
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RAID 5 vs. RAID 6 or do you care about your data?
Storage is cheap. Lots of storage with 10+ hard drives is still cheap. Running 10 drives increases the risk of a drive failure tenfold. So often RAID 5 is used to keep your data up and running if one...
View ArticleLinux Software RAID benchmarking script
Just a small post.To benchmark your Linux software RAID array as setup with MDADM, please use my new benchmark script. I used this script to create these results.You may need to configure some values...
View ArticleDo not buy a hardware RAID controller for home use
Hardware RAID controllers are considered 'the best' solution for high performance and high availability. However, this is not entirely true. Using a hardware RAID controller might even endanger your...
View ArticleSpeeding up Linux MDADM RAID array rebuild time using bitmaps
When a disk fails or gets kicked out of your RAID array, it often takes a lot of time to recover the array. It takes 5 hours for my own array of 20 disks to recover a single drive.Wouldn't it be nice...
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