Rick James <rja...@yahoo-inc.com> wrote: > >When writing a random block, RAID-5 does not need to touch all the >drives, only the one with parity. Suitable XORs will update it >correctly. So, a write hits 2 drives, whether you have RAID-5 or -10.
Only if the other blocks happen to be in the cache, otherwise a read is required. We performed the tests when we last added storage to our media farm. On the other hand I'm not too familiar wit the actual algorithms used, so our findings might be vendor-dependant. -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
