Current thinking regarding XFS and RAID arrays - Penguin Computing
I recently advised a customer as follows: OK. First, a note about performance testing. You don’t want to use the default DD block size of 512bytes. That’s much too small to get the best performance. 1megabyte (bs=1M) is probably the minimum I would use for streaming copy/read/write testing. The Linux kernel’s memory caching of writes turns out to actually get in the way for any large streaming wri
Setting up XFS on Hardware RAID -- the simple edition
There are about a gazillion FAQs and HOWTOs out there that talk about XFS configuration, RAID IO alignment, and mount point options. I wanted to try to put some of that information together in a condensed and simplified format that will work for the majority of use cases. This is not meant to cover every single tuning option, but rather to cover the important bases in a simple and easy to unders
Aligning IO on a hard disk RAID – the Theory
Now that flash storage is becoming more popular, IO alignment question keeps popping up more often than it used to when all we had were rotating hard disk drives. I think the reason is very simple – when systems only had one bearing hard disk drive (HDD) as in RAID1 or one disk drive at all, you couldn’t really have misaligned IO because HDDs operate in 512-byte sectors and that’s also the smalles
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