Hello, here is a screendump of a atop -dD in such a situation. Regards Daniel Am 04/24/2012 05:00 PM, schrieb Roberto Spadim: > it´s a read, a write, or both operation? > about load i think it´s a very big read (sdb) with a very low write (sda) > the disk balance on raid1 is based on nearest (current position - next > read position) disk > on a sequencial read only one disk is better used > > i checked that raid1 'have this problem' but it´s a hardware limit, i > didn´t found a solution, maybe others friends can found > > Em 24 de abril de 2012 11:46, Daniel Spannbauer <ds@xxxxxxxx > <mailto:ds@xxxxxxxx>> escreveu: > > Hello, > > at the moment I'm trying to find a bottleneck on my lamp-server with > opensuse 11.4 (Kernel 2.6.37.6) > > Sometimes the system has a very poor performance because of a high > io-wait. > If I watch the systems disk-access with "atop -dD" I can see that sda is > the most of the time at a load of 10%, sdb sometimes is at 100% or > higher at the same time. > > In my opinion in a Raid1-System both disk should have nearly the > same load. > > Or may I wrong whis this? > > Both harddisks where changed 3 Weeks ago, /proc/mdstat shows that the > rebuild was successfull and the array is functional. Today I've changed > th SATA-Cable and the Port on the Maindboard of sdb, but the behaviour > is still the same. Both disks passed the extended smart-self-test. > > Any ideas about that? > > Regards > > Daniel > > > > -- > Daniel Spannbauer Software Entwicklung > marco Systemanalyse und Entwicklung GmbH Tel +49 8333 9233-27 > <tel:%2B49%208333%209233-27> Fax -11 > Rechbergstr. 4 - 6, D 87727 Babenhausen Mobil +49 171 4033220 > <tel:%2B49%20171%204033220> > http://www.marco.de/ Email ds@xxxxxxxx > <mailto:ds@xxxxxxxx> > Geschäftsführer Martin Reuter HRB 171775 Amtsgericht München > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > <mailto:majordomo@xxxxxxxxxxxxxxx> > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > -- > Roberto Spadim > Spadim Technology / SPAEmpresarial -- Daniel Spannbauer Software Entwicklung marco Systemanalyse und Entwicklung GmbH Tel +49 8333 9233-27 Fax -11 Rechbergstr. 4 - 6, D 87727 Babenhausen Mobil +49 171 4033220 http://www.marco.de/ Email ds@xxxxxxxx Geschäftsführer Martin Reuter HRB 171775 Amtsgericht München -- 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
