From mboxrd@z Thu Jan 1 00:00:00 1970 From: mru@kth.se (=?iso-8859-1?q?M=E5ns_Rullg=E5rd?=) Subject: Re: RAID1 over RAID0 misbehavior Date: Wed, 07 Jan 2004 09:48:51 +0100 Sender: linux-raid-owner@vger.kernel.org Message-ID: References: <200401070451.i074pDi24362@dns1.watkins-home.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: To: linux-raid@vger.kernel.org List-Id: linux-raid.ids "Guy" writes: > linux-raid-owner@vger.kernel.org wrote: > > > I recently created a RAID1 mirror from two identical RAID0 arrays > > under Linux 2.6.0. I was surprised when /proc/mdstat reported a > > resync speed of 1 MB/s, even though the system was otherwise idle. = I > > increased the min sync rate in /proc/sys/dev/raid/speed_limit_min t= o a > > large value, and was happy to see the resync rate increase to 40 MB= /s. > > It seems to me like something confused the RAID1 layer into thinkin= g > > there was lots of IO going on in the system. My guess is that the > > disk IO generated by the RAID0 is being overlooked by RAID1 as bein= g > > caused by the resync rather than other system activity. Whatever t= he > > cause, the current behavior is no good. I have no idea how to fix = it, > > though. > > You did not state your max speed setting. > Did you try to increase the max speed? The max speed was 200000, and I left it there. That is also the value I set min speed to, just to make sure I'd max out the disks. --=20 M=E5ns Rullg=E5rd mru@kth.se - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html