Learn what strip size, stripe width and stripe size mean, and how they affect performance. For more RAID topics visit dell.com/support.
In this video, we'll look at strip size, stripe width and stripe size, how they relate to each other and how they affect performance. Strip size or segment size is the amount of data written to a single disk as part of a single stripe.
Stripe width is the number of disks the data is striped across, not including parity. Stripe size is the total size of the stripe, calculated by multiplying the strip size by the stripe width.
When deciding strip size, consider the data being transferred. In general, for a large sequential IO, aim to have all disks operating simultaneously.
In this example, let’s look at a 512k write. With the strip size set to 128k, all four disks operate simultaneously, improving the write speed.
With the strip size set to 512k, only one disk is used. For a large sequential IO, set the strip size to the maximum value that still utilizes all disks in a single read or writes.
For small random IO, aim to satisfy a single read or write with a single disk. This leaves the other disks free to satisfy a request from other threads or processes for maximizing concurrency.
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