Hi, Assume I want to build a 8 x 250GB disks RAID-5, totally around 1.7TB, with ext3 file system, 4KB block size, and 32KB chunk size. Almost half of the files will be very small ( < 8KB), I'm quite confused with how RAID-5 store data so I want to understand how relation between file system block size and RAID5 chunk size, to minimize possible wasted space. I understand that if I store a 224KB file into the RAID5, the file will be divided into 7 parts x 32KB, plus 32KB parity. (Am I correct in this?) However, If I store a file smaller than chunk size into the RAID5, what will happen? For example, If I store a 1KB file into it, how much disk space will be used? will it 4KB (plus 4KB parity or 1KB parity) ? Similiarly, If I store a 6KB file, will it takes 8KB (plus 8KB parity or 6KB parity) ? If ALL of my files are 6KB, will the physical disk space allocated to parity NOT ENOUGH to serve the whole filesystem? Please CC me if possible, thanks. Kyle - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
