From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: mdadm raid6 recovery status Date: Thu, 29 Mar 2012 10:27:04 +1100 Message-ID: <20120329102704.14b08f2a@notabene.brown> References: <20120328151148.035bd737@notabene.brown> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/y3YteD4HgWCNEH.zqgpdUas"; protocol="application/pgp-signature" Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: "Paramasivam, Meenakshisundaram" Cc: "linux-raid@vger.kernel.org" List-Id: linux-raid.ids --Sig_/y3YteD4HgWCNEH.zqgpdUas Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Wed, 28 Mar 2012 12:49:18 +0000 "Paramasivam, Meenakshisundaram" wrote: > [root@in-rady-neuro9 ~]# df -kl /myarray > Filesystem 1K-blocks Used Available Use% Mounted on > /dev/md2 11537161976 162432 10950945196 1% /myarray > Should be 7TB of used space. This is bad. Something has happened to your filesystem. It is almost as though someone ran "mkfs" on the array. I don't know much about recovery after such an action, but I doubt you will get much back. >=20 > [root@in-rady-neuro9 ~]# cat /proc/partitions > major minor #blocks name >=20 > 8 0 438960128 sda > 8 1 512000 sda1 > 8 2 51200000 sda2 > 8 3 387247104 sda3 > 8 16 1953514584 sdb > 8 32 1953514584 sdc > 8 48 1953514584 sdd > 8 64 1953514584 sde > 8 80 1953514584 sdf > 8 96 1953514584 sdg > 8 112 1953514584 sdh > 8 128 1953514584 sdi > 253 0 346226688 dm-0 > 253 1 40992768 dm-1 No md2 ??? >=20 > sd[b-i] are raid devices >=20 > [root@in-rady-neuro9 ~]# mdadm --detail /dev/md2 > /dev/md2: > Version : 0.90 > Creation Time : Fri Dec 16 17:56:14 2011 > Raid Level : raid6 > Array Size : 11721086976 (11178.10 GiB 12002.39 GB) > Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB) <<<=3D=3D=3D=3D=3D= =3D Wrong! Should be 7TB of used array space. "Used Dev Size" isn't "how much of the array is used by the filesystem" - mdadm doesn't know anything about filesystems. It is "How much of each individual device is used by the array", which is usually a little less than the size of the smallest device. So 2TB is correct here. NeilBrown --Sig_/y3YteD4HgWCNEH.zqgpdUas Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iQIVAwUBT3OeSDnsnt1WYoG5AQLwQg/+P270Ji+w8wAfDOTMU67qO39jsZgkSVjN zuukAYObQfRCCVFd/RlIzx/OKaQwBdaLwwNH1x8yT+QG11ImBa7ZGfiJ/NtspyHW 8kKLbq6DBn7IoPC8jtU+pR3DhMkNQcnpEIil8gOnMyYud/a+U0OFqk1K07hVm4Bb cSm4HYwuBkWP+eRbnDlXnB2zyVfxp0Z3rff78xdMpuVEBhApKbj0ydp2wO4VdBFV O1T3IytUy/i9hfeTAzyrodEUWClxoei/tAz8tGXqGApyuGI+XmxTCUaXLYt2bDC7 BbR7SmOfX8gmoAYXOtSHluCMjYzcNmbqRcR/+awi9y278HUcpf/EJYtshJwMdD2/ Ew7lQcU7mY6DMGoKusHPXujobZK3L7ETBcau1fKWAevJPPot86G2+039wGUcATCM TLBiNd3upaFRAtO4FSbMlHTPR4lClqqg7JUK8TX1SQK0FxsoLi76DWaRQCbW3RqS bFI5wHQ/SmQELohPqP8KQ0WvX6Wn3TE33bZFoxx0WdJ1QuGJn/wGcOY6VPP5FaIt Ch09/qG7hDELVkiWdlVu+2cDfM2O42PmHXzG/fvzfEi4i/FralLLRti+noM/ce23 mNUlDyIHRzDgYPr/aKM5gbZmJoseqMCpDoa6R3E2tUw3dK2KGSMcdruhnOkMvqBA fEgBe0NI2qM= =3+oQ -----END PGP SIGNATURE----- --Sig_/y3YteD4HgWCNEH.zqgpdUas--