From: Nikola Ciprich Subject: running mkfs.ext4 causes very high system load Date: Thu, 22 Mar 2012 15:05:47 +0100 Message-ID: <20120322140547.GA10657@pcnci2.linuxbox.cz> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="VbJkn9YxBvnuCH5J" Cc: nikola.ciprich@linuxbox.cz, Radovan Mzik To: linux-ext4@vger.kernel.org Return-path: Received: from gwu.lbox.cz ([62.245.111.132]:55729 "EHLO gwu.lbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752458Ab2CVOV0 (ORCPT ); Thu, 22 Mar 2012 10:21:26 -0400 Content-Disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: --VbJkn9YxBvnuCH5J Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, we've hit strange problem on one of our servers today. We needed to add new logical volume, so created 320GB LV, and tried to create ext4 using: $ mkfs.ext4 /dev/vg/home2 the problem is, it progressed very slow, and seemed to block all other applications currently trying to access disks, thus causing system lo= ad jumping much over 150. The system itself is not idle, but it's not too loaded too (loadavg is usua= lly <1), it's x86_64 centos5 running 2.6.32.59 with 4GB RAM and common SATA dri= ves. I tried running mkfs.ext4 via ionice, but it didn't get much better. we're using e2fsprogs-1.41.14 Is this common that mkfs can load system that much? Is it possible to mitigate this negative effect somehow? (I think that using 3.3 kernel might improve disk load handling, but I need to stick to 2.6.32 for some more time) thanks a lot in advance! nik --=20 ------------------------------------- Ing. Nikola CIPRICH LinuxBox.cz, s.r.o. 28. rijna 168, 709 01 Ostrava tel.: +420 596 603 142 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: servis@linuxbox.cz ------------------------------------- --VbJkn9YxBvnuCH5J Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) iEYEARECAAYFAk9rMbsACgkQ3xdJJrLygV5B0QCghR87tgCVxfqiTiMCas/RKM+/ ibEAoNg12V/UVXehK2tn8TfzY7CGWupT =V0aq -----END PGP SIGNATURE----- --VbJkn9YxBvnuCH5J--