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Proper alignment for hardware raid-10 with SSDs
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Posted by AndyB78, 10-26-2013, 06:04 PM I am trying to determine the correct procedure to properly align a hardware RAID-10 (LSI 9260) built with 4 x Intel DC S3500 SSDs. Partition alignment From what I've been able to research this is the easier part. It seems to be enough the run fdisk with specific heads/sectors parameters like this: fdisk -H 32 -S 32 /dev/sdX, or, fdisk -H 224 -S 56 /dev/sdX File system alignment This is where things become very fuzzy. Apparently I should follow this tutorial for instance: http://wiki.centos.org/HowTos/Disk_Optimization 1. According to some opinions stride is irrelevant for hardware raid. Is that so? 2. In MegaCli we can get with -LdPdInfo the "stripe size". Is this the chunk-size or stripe size for the entire stripe set? 3. In raid-10 how many data containing devices do we consider for calculations? 2 or 4? According to some materials it is 2. 4. How do we find if the block size of the raid device is 512 bytes or 4k? A fdisk -l on the raid device is enough? And finally: 5. Is there some authority material that defines very clearly and exactly all the various notions like stripe size, stripe width, stride, chunk etc? Please help with some clarifications.
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