http://blog.csdn.net/striping/article/details/17449645
strip 、 stripe
和chunk的概念
说句实话，对于存储里面 strip 和 stripe
这样基础的概念，一直都在术语层面有些混淆(英文拼写太相近了)，实在有些丢脸。好在看到了一个帖子，发现没有分清strip和stripe的还远远不止我一个，呵呵
http://bbs.doit.com.cn/viewthread.php?tid=63290
其实看看下面的图，就清楚两者的区别了. 从英语本意来讲，记住 stripe 比 strip 更"长"就不会弄混淆了。
strip是"条", 有一块的意思:
long narrow piece (of material, etc) or area (of land, etc)
Stripe 是条纹:
long narrow band (usu of the same width throughout its length) on a surface
that is usu different from it in colour, material or texture
从我的理解而言：
stripe size = strip size * stripe depth
stripe = chunk / strip size = chunk size
block 基本上可以认为就是 sector
SNIA Dictionary中对于本帖中所涉及名词的解释
extent
1. [Storage System] A set of consecutively addressed FBA disk
blocks that is allocated to consecutive addresses of a single file.
2.
[Storage System] A set of consecutively located tracks on a CKD disk that is
allocated to a single file.
3. [Storage System] A set of consecutively
addressed disk blocks that is part of a single virtual disk-to-member disk array
mapping.
A single disk may be organized into multiple extents of different
sizes, and may have multiple (possibly) non-adjacent extents that are part of
the same virtual disk-to-member disk array mapping. This type of extent is
sometimes called a logical disk.
strip
[Storage System] The consecutively
addressed blocks in a single extent.
A disk array‘s controller uses strips to
map virtual disk block addresses to member disk block addresses. Also known as
stripe element.
strip size
[Storage System] Synonym for stripe
depth.
stripe
[Storage System] The set of strips at corresponding
locations of each member extent of a disk array that uses striped data
mapping.
The strips in a stripe are associated with each other in a way
(e.g., relative extent block addresses) that allows membership in the stripe to
be quickly and uniquely determined by a computational algorithm. Parity RAID
uses stripes to map virtual disk block addresses to member extent block
addresses.
stripe depth
1. [Storage System] The number of blocks in a
strip in a disk array that uses striped data mapping.
2. [Storage System] The
number of consecutively addressed virtual disk blocks mapped to consecutively
addressed blocks on a single member extent of a disk array.
stripe
element
[Storage System] Synonym for strip.
stripe size
[Storage
System] The number of blocks in a stripe.
A striped array‘s stripe size is
the stripe depth multiplied by the number of member extents. A parity RAID
array‘s stripe size is the stripe depth multiplied by the number of member
extents less the number of parity extents.
chunk
[Storage System] Synonym
for strip.
chunk size
[Storage System] Synonym for stripe depth and strip
size.
block
1. [Storage System] The unit in which data is stored and
retrieved on disk and tape devices; the atomic unit of data recognition (through
a preamble and block header) and protection (through a CRC or ECC).
2. [Fibre
Channel] A unit of application data from a single information category that is
transferred within a single sequence