On Wednesday June 6, jnelson-linux-raid@xxxxxxxxxxx wrote: > > A question posed by a friend is this: assuming 64K blocks, if I read a > single stripe from a raid (128K, right?) then two drives will be used > (say, drive A and drive B). If I want the "next" 128K then which drives > are most likely to be used? Drive A will now have the parity block in > it's "next" block for head position, but drive B has the next data > block. Nobody knows where drive C is. Does raid5 use an algorithm > similar to raid1 in that it chooses the 2 drives whose heads are closest > or does it utilize some other algorithm? No. When it wants data, it just reads the data. It doesn't try to be clever an read the parity block and calculate the data (unless the data block doesn't exist of course). NeilBrown - 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
