From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: /dev/md0 can't be created Date: Wed, 25 Mar 2015 17:35:29 +1100 Message-ID: <20150325173529.13a6efd7@notabene.brown> References: <1215809785.2787621.1427263359309.JavaMail.zimbra@redhat.com> <12135556.2792023.1427264134774.JavaMail.zimbra@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; boundary="Sig_/R5bj/z+uC5WJN+.Ob0NSvq."; protocol="application/pgp-signature" Return-path: In-Reply-To: <12135556.2792023.1427264134774.JavaMail.zimbra@redhat.com> Sender: linux-raid-owner@vger.kernel.org To: Xiao Ni Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids --Sig_/R5bj/z+uC5WJN+.Ob0NSvq. Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 25 Mar 2015 02:15:34 -0400 (EDT) Xiao Ni wrote: > Hi all >=20 > I have encountered so many times, the raid device is created successfu= lly, but the directory > /dev/md0 can't be created. It can't reproduce 100%.=20 >=20 > [root@intel-sugarbay-do-01 create_assemble]# cat /proc/mdstat=20 > Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]=20 > md0 : active raid10 loop7[7](S) loop6[6] loop5[5] loop4[4] loop3[3] loop2= [2] loop1[1] loop0[0] > 1788416 blocks super 1.2 512K chunks 2 near-copies [7/7] [UUUUUUU] > bitmap: 0/1 pages [0KB], 65536KB chunk >=20 > unused devices: > [root@intel-sugarbay-do-01 create_assemble]# ls /dev/md0 > ls: cannot access /dev/md0: No such file or directory >=20 > The underline devices are loop devices which are created with big fil= e. >=20 > The kernel I used is RHEL7 (3.10.0-234.el7.x86_64.debug, mdadm - v3.3= .2 - 21st August 2014)=20 > I'll try to reproduce this with upstream kernel and mdadm. But I think it= shouldn't be the problem about kernel. >=20 > What do you think I should check for this? And which tool is responsi= ble for creating the directory? Maybe > I can add some log to it to find the reason. >=20 /dev/md0 is created by udev. Run udevadm monitor to see the events that udev is processing. When and ADD event for "md0" is processed, /dev/md0 should get created. NeilBrown --Sig_/R5bj/z+uC5WJN+.Ob0NSvq. Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIVAwUBVRJXMTnsnt1WYoG5AQLCzg/+N7XIMeYoTzRWd5219GM5/yHLk9oPaR/L mALBN9BSYFmpuuAavRYLA8OgT2hApnJNQ3/KCIKP3BZhk5shiuOUlJp0KV+eR+RE /m5HH9rSIdjpAGDQ/5QYTXuTD5I1EeSCzgssgjjmDvQr2eK87wqSMeAceJXqUari gv3PzoxcA4KsV8vhR15EzSICymv9Vqcr//lvWL+DbLwkmT9BchFu+H98Mww9IMWe Dy5JteT8nGlWOpvY4X0tORVgFVk4Jjcjt0eUM9z+FFk7cnMB8+SDOKQKT+ZMmWli MjaHGA/q0AYb26X8odSc+yPelRk/3aGNaQD2flZou4bLOIq5BYEXIGsKsRqybx1Y pq4raqiBd7b+ueHfnTqXn9cPl2mKzlosdXW/1rPv5I62OmkR9AY89i5KPyxoru2N UMQUqQ4l14S98xgjblzL+vXDvwLp4P/ZJLaZC2wzBGG/wiUsQlrQF5EfNxJur79Q XPo+QpsWmGRmUYvbU06VKAIj6YkCCoxvxBhqnqCnAyYGynIsjlJmyirwj8u9qCRm 84/GFWDo73AHuhbRNF3lGCu25S/omS3gm2UzgHUG8cBakDai1MGY6oHCrp8Zermp ezfsKjh/4k1B21aGCu/gex+8RWAqZwdnb+rPV930xreziRor8kq4cN3i7FKayTEX 9b1C3ncMsQk= =uNyP -----END PGP SIGNATURE----- --Sig_/R5bj/z+uC5WJN+.Ob0NSvq.--