On Saturday November 19, carlos@xxxxxxxxxxxxxx wrote: > I've just installed a new server with a 5-disk raid5 and kernel > 2.6.14.2. To check something I did a hard reset without shutdown and > on reboot the machine didn't do any automatic resync; all arrays are > shown clean. > > Is this some automatic intent-logging or another 2.6 feature (the > machine had been really idle for minutes before the reset)??? This is > my first 2.6 raid5 and with 2.4 resync does happen... You could put it this way: 2.6 has a default 'intend log' of 1 bit that covers the whole array. Before writing, it sets the bit. 20msecs after there has been no write activity, it clears the bit. This bit is always known as the 'dirty' or 'active' bit. (When you have full bitmap intent logging, each bit covers much less space, and the timeout for clearing bits is about 10seconds (by default) rather than 20msecs) 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
