From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx16.extmail.prod.ext.phx2.redhat.com [10.5.110.21]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id rA7A1eui024718 for ; Thu, 7 Nov 2013 05:01:40 -0500 Received: from outpost1.zedat.fu-berlin.de (outpost1.zedat.fu-berlin.de [130.133.4.66]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id rA7A1aSR029475 for ; Thu, 7 Nov 2013 05:01:36 -0500 Received: from inpost2.zedat.fu-berlin.de ([130.133.4.69]) by outpost1.zedat.fu-berlin.de (Exim 4.80.1) for linux-lvm@redhat.com with esmtp (envelope-from ) id <1VeMP8-003Qbq-Vb>; Thu, 07 Nov 2013 11:01:35 +0100 Received: from triton.geoinf.fu-berlin.de ([130.133.86.10]) by inpost2.zedat.fu-berlin.de (Exim 4.80.1) for linux-lvm@redhat.com with esmtpsa (envelope-from ) id <1VeMP8-001y8c-T9>; Thu, 07 Nov 2013 11:01:34 +0100 Message-ID: <527B652D.2040408@fu-berlin.de> Date: Thu, 07 Nov 2013 11:02:21 +0100 From: Sebastian Walter MIME-Version: 1.0 References: <5253CB06.2000901@fu-berlin.de> <1381273135.70303.YahooMailNeo@web181501.mail.ne1.yahoo.com> <52550C81.2020607@fu-berlin.de> In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms030806090101000308040900" Subject: Re: [linux-lvm] Find Correct LE Size of ext4 Filesystem (16TB) Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: linux-lvm@redhat.com This is a cryptographically signed message in MIME format. --------------ms030806090101000308040900 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi list, It took me a while to get the server off from production, but finally Matthew's method worked. I shrank the filesystem to 15TB, then set up the LV to exactly 16TB and finally expanded the filesystem to the size of the LV. Thanks! Many regards, Sebastian On 10/09/2013 11:42 AM, Gabriel wrote: > I think what Matthew is saying is that you should first shrink your > filesystem to a smaller size (15.8 TiB), then adjust the LV size to 16 > TiB (this is safe because the filesystem above is smaller) and finally > resize the filesystem to the LV size (resize2fs /your/filesystem). > This is a much safer approach and leaves you with no unused space. >=20 > On Wed, Oct 9, 2013 at 10:57 AM, Sebastian Walter > wrote: >> Hi Matthew, >> >> On 10/09/2013 12:58 AM, matthew patton wrote: >> >>> >>> The whole point of using LVM is to dispense with the malarky of hard = disk partitions so I don't know why you're resizing them. If I read your = email correctly you're going about this dangerously.> >> >> Thanks for pointing this out. Now I realize that I used the term >> "partition" instead of "filesystem" erroneously (changed subject). >> >> What I initially wanted to do is to extend the filesystem to the whole= >> size of the underlying physical disks. So first I extended the LV to >> fill the disks (19TB). As the second step I wanted to resize the ext4 >> filesystem to the LV size of 19TB. This last step failed with an error= >> message saying that tune4fs can't allocate more than 16TB. Setting the= >> filesystem's size to 16T worked. >> >> Now I have a 16TB filesystem on a 19.18TB logical volume. The addition= al >> 3TB are unused on the LV so I want to reduce the LV to the same size a= s >> the filesystem. This way I could use the 3TB for other LVs. >> >>> 3) resize2fs (no args) >>> >>> Step 3 will resize the FS to as close as the LV size allows and won't= let you write past the LV's endpoint like your method makes so easy to s= crew up when doing the extent calculation. Maybe your maths are always pe= rfect but I wouldn't risk my data for a measly few bytes. Do it the fool-= proof way. >> >> I agree with you that resizing the filesystem to the therotical values= >> of the LV geometry is much too risky. >> >> What would be the fool-proof way? Creating a new filesystem on a 16TB = LV >> and copying the data from the backup? >> >> Or is it really safe to reduce the LV by some amount - let's say 2.5TB= - >> and sacrifice 500GB for safety? >> >> Thanks! Sebastian >> >> >> _______________________________________________ >> linux-lvm mailing list >> linux-lvm@redhat.com >> https://www.redhat.com/mailman/listinfo/linux-lvm >> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >=20 > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >=20 --=20 Dipl.-Geol. Sebastian Walter Freie Universitaet Berlin - Institute of Geological Sciences Planetary Sciences and Remote Sensing Malteserstrasse 74-100 - 12249 Berlin, Germany Phone: +49 30 838 70541 --------------ms030806090101000308040900 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIPHDCC BCEwggMJoAMCAQICAgDHMA0GCSqGSIb3DQEBBQUAMHExCzAJBgNVBAYTAkRFMRwwGgYDVQQK ExNEZXV0c2NoZSBUZWxla29tIEFHMR8wHQYDVQQLExZULVRlbGVTZWMgVHJ1c3QgQ2VudGVy MSMwIQYDVQQDExpEZXV0c2NoZSBUZWxla29tIFJvb3QgQ0EgMjAeFw0wNjEyMTkxMDI5MDBa Fw0xOTA2MzAyMzU5MDBaMFoxCzAJBgNVBAYTAkRFMRMwEQYDVQQKEwpERk4tVmVyZWluMRAw DgYDVQQLEwdERk4tUEtJMSQwIgYDVQQDExtERk4tVmVyZWluIFBDQSBHbG9iYWwgLSBHMDEw ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDpm8NnhfkNrvWNVMOWUDU9YuluTO2U 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