From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id mBN1XmEY007938 for ; Mon, 22 Dec 2008 20:33:48 -0500 Received: from omr7.networksolutionsemail.com (omr7.networksolutionsemail.com [205.178.146.57]) by mx3.redhat.com (8.13.8/8.13.8) with ESMTP id mBN1XVYY021132 for ; Mon, 22 Dec 2008 20:33:31 -0500 Received: from mail.networksolutionsemail.com (ns-omr7.mgt.netsol.com [10.49.6.70]) by omr7.networksolutionsemail.com (8.13.6/8.13.6) with SMTP id mBN1XUva024716 for ; Mon, 22 Dec 2008 20:33:30 -0500 From: "Steve Costaras" References: <1229884467.5412.26.camel@localhost.localdomain><5440B12A673140C89F22744165C88838@analytical> <20081223012443.GB17247@agk.fab.redhat.com> Subject: RE: [linux-lvm] LVM2 robustness w/ large (>100TB) name spaces? Date: Mon, 22 Dec 2008 19:33:36 -0600 MIME-Version: 1.0 Message-ID: <1EDA649E10E54ABFA14B31B7D732CEFC@analytical> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=SHA1; boundary="----=_NextPart_000_0017_01C9646C.2E5F8FB0" In-Reply-To: <20081223012443.GB17247@agk.fab.redhat.com> 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: 'LVM general discussion and development' This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C9646C.2E5F8FB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thanks, I was planning on using a larger metadata area anyway, just to play it safe as I'm expecting a 3-4x growth for the life of the array before next hard rebuild and all the comments I've seen on the Inet are talking about much smaller array sizes than what I'm building. Is there any rule of thumb or sizing guidelines or is it a black art? With PE/LE's being 32bit (or is it a signed 32bit so 31 bits?) Either way, that's more than enough even w/ 4MiB sizes for the expected end-state of the name space. -----Original Message----- From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On Behalf Of Alasdair G Kergon Sent: Monday, December 22, 2008 19:25 To: LVM general discussion and development Subject: Re: [linux-lvm] LVM2 robustness w/ large (>100TB) name spaces? From the LVM2 point of view, extents (PEs/LEs) are counted using 32-bit numbers so that's where the limit comes from. (You can change extent size later, shuffling extent boundaries with pvmove first as necessary.) The stripe size is controlled by a separate parameter essentially independent of the PE size. When creating the PVs, use a larger-than-default size for the metadata area: it is awkward to change later if you fill it up. Alasdair -- agk@redhat.com _______________________________________________ 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/ ------=_NextPart_000_0017_01C9646C.2E5F8FB0 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIL8zCCBK4w ggKWoAMCAQICAwXINzANBgkqhkiG9w0BAQUFADB5MRAwDgYDVQQKEwdSb290IENBMR4wHAYDVQQL ExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNBIENlcnQgU2lnbmluZyBBdXRob3Jp dHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRAY2FjZXJ0Lm9yZzAeFw0wODA5MTkyMDQ1NTJaFw0w OTAzMTgyMDQ1NTJaMD0xGDAWBgNVBAMTD0NBY2VydCBXb1QgVXNlcjEhMB8GCSqGSIb3DQEJARYS c3RldmVjc0BjaGF2ZW4uY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDDFrIzE7UKfd8F HA2O+y/Dp3j6ojSalos1sJyVx3NCFAtwZUARScjiVaRL5N+NtllpLJfD37cC+mqGzs7cdZVG3mRg 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