I was seeing similar rebuild performance on my large number of RAID1 arrays (the first rebuilds went speedy and subsequent ones slowed down after the first ones completed). I bumped up the speed_limit_min and the rebuild performance went up to where I expected it to be. What were you speed_limit_[min|max]? -----Original Message----- From: Sean Kormilo [mailto:skormilo@nortelnetworks.com] Sent: Thursday, March 13, 2003 8:48 AM To: Neil Brown Cc: linux-raid@vger.kernel.org Subject: Re: [PATCH] md - 1 of 12 - Missing mddev_put in md resync code Neil, > > No. There have been lots of changes since 2.4. Some patches might > conceptually apply, but they would need a bit of work to make them > actually apply. Ok, then I won't give it a try. Thanks for the heads up. > > > > > It looks like one or more of these might reduce the chances of the > > kernel oops I experience on occasion when manipulating arrays. > > Would this be when removing a recently-failed device? That can still > oops. I should send in a patch for that... Yes in fact, that is the one I was seeing. > These patches are about management, not performance. They won't > affect rebuild performance at all. It is already quite good in 2.4 I > believe. But maybe my experience is different from your. I have an odd problem where the first rebuild performs as expected (about 40MB/s), but any subsequent rebuild plods along at about 6-7MB/s. There is no IO activity on the system other than the rebuild during my tests. I tried putting in a couple of debug printk's here and there in the code that backs off the resync, and the printk's themselves returned the performance back to expected levels... some kind of a timing problem perhaps? Sean. -- Sean C. Kormilo, STORM Software Architect, Nortel Networks email: skormilo@nortelnetworks.com - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
