On Mon, November 2, 2009 6:41 am, Thomas Fjellstrom wrote: > On Sun November 1 2009, Andrew Dunn wrote: >> Are we to expect some resolution in newer kernels? > > I assume all of the new per-bdi-writeback work going on in .33+ will have > a > large impact. At least I'm hoping. > >> I am going to rebuild my array (backup data and re-create) to modify the >> chunk size this week. I hope to get a much higher performance when >> increasing from 64k chunk size to 1024k. >> >> Is there a way to modify chunk size in place or does the array need to >> be re-created? > > This I'm not sure about. I'd like to be able to reshape to a new chunk > size > for testing. Reshaping to a new chunksize is possible with the latest mdadm and kernel, but I would recommend waiting for mdadm-3.1.1 and 2.6.32. With the current code, a device failure during reshape followed by an unclean shutdown while reshape is happening can lead to unrecoverable data loss. Even a clean shutdown before the shape finishes in that case might be a problem. 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
