Here's some metadata from which I tried to figure out how HP Smart Array P420 controller saves certain values. Feel free to use it ^^

• multiple-logical-raid5 contains I think 7 drives, all with default stripe size, which is 256K:
  • 100M
  • 100M
  • 200M
  • 400M
  • 800M
  • 1600M
  • 3200M
• raid0 contains 4 RAID 0 arrays using all space of 3.6TB Drives:
  • 1 drives
  • 2 drives
  • 3 drives
  • 4 drives
• raid5-stripe-size was used by me to find where is stripe size, it has logical drives with stripe sizes of:
  • 8K
  • 16K
  • 32K
  • 64K
  • 128K
  • 256K
  • 512K
  • 1024K

All of this data helped me to figure out where are stored:

• stripe size
• logical drive size
• logical drive offset relative to physical drive
• used space on each physical drive by logical drive

All numbers are big endian, sizes are in 512-byte sectors, including stripe size. So 8K stripe size will be encoded as 0x0010, 256K stripe size - 0x0200

Each metadata entry for logical drive is 2080 bytes in size and starts with logical drive label.

I will put a link to metadata layout when I finish metadata parser.