From mboxrd@z Thu Jan 1 00:00:00 1970 From: Farkas Levente Subject: Re: poor performance with raid1 / raid0 Date: Wed, 18 Jun 2003 16:52:12 +0200 Sender: linux-raid-owner@vger.kernel.org Message-ID: <3EF07C9C.7070802@bnap.hu> References: <1055943743.31927.20.camel@cinshrlnxws01.shermfin.com> <3EF079A9.9FB561AF@SteelEye.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <3EF079A9.9FB561AF@SteelEye.com> To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Paul Clements wrote: > Per Andreas Buer wrote: > >>Andrew Rechenberg writes: >> >> >>>Check /proc/sys/dev/raid/speed_limit_[min|max]. If they are set too low >>>then your re-mirror will behave as such. To change just echo a new >>>value: >>> >>>echo 30000 > /proc/sys/dev/raid/speed_limit_min >>>echo 50000 > /proc/sys/dev/raid/speed_limit_max >>> >> >>I did so - and now: >> >>md6 : active raid1 md16[2] sdd6[0] >> 117185984 blocks [2/1] [U_] >> [>....................] recovery = 0.1% (229120/117185984) >>finish=59.5min speed=32731K/sec > > > That's probably because you just lowered the values. The maximum is > normally 100000. To check what the default values are, reboot and do: > > cat /proc/sys/dev/raid/speed_limit_* > > Then echo a _larger_ number into those files. > > There is no absolute maximum value (except maybe 2^32), so don't be > afraid to raise the values to 10 or 100 times what they were. That > should ensure that your resync speed is close to its theoretical > maximum. can someone tell me what these numbers means? of course my goal (as everyones) to achieve the maximum possible performance. can I do any harm if I set these numbers to high? it no, why not set it bu default? thanks in advance. -- Levente "Si vis pacem para bellum!"