From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p6JMbTD0197009 for ; Tue, 19 Jul 2011 17:37:29 -0500 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 0D54817FE61D for ; Tue, 19 Jul 2011 15:37:27 -0700 (PDT) Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id vYLTG2GcBpOzDyhk for ; Tue, 19 Jul 2011 15:37:27 -0700 (PDT) Message-ID: <4E260725.4040003@hardwarefreak.com> Date: Tue, 19 Jul 2011 17:37:25 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: 30 TB RAID6 + XFS slow write performance References: <4E24907F.6020903@johnbokma.com> <20110719103719.18c4773f@galadriel.home> In-Reply-To: <20110719103719.18c4773f@galadriel.home> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Emmanuel Florac Cc: xfs@oss.sgi.com, John Bokma T24gNy8xOS8yMDExIDM6MzcgQU0sIEVtbWFudWVsIEZsb3JhYyB3cm90ZToKPiBMZSBNb24sIDE4 IEp1bCAyMDExIDE0OjU4OjU1IC0wNTAwIHZvdXMgw6ljcml2aWV6Ogo+IAo+PiBjYXJkOiBNZWdh UkFJRCBTQVMgOTI2MC0xNmkKPj4gZGlza3M6IDE0eCBCYXJyYWN1ZGHCriBYVCBTVDMzMDAwNjUx QVMgM1RCICgyIGhvdCBzcGFyZXMpLgo+PiBSQUlENgo+PiB+IDMwVEIKCj4gVGhpcyBjYXJkIGRv ZXNuJ3QgYWN0aXZhdGUgdGhlIHdyaXRlIGNhY2hlIHdpdGhvdXQgYSBCQlUgcHJlc2VudC4gQmUK PiBzdXJlIHlvdSBoYXZlIGEgQkJVIG9yIHRoZSBwZXJmb3JtYW5jZSB3aWxsIGFsd2F5cyBiZSB1 bmJlYXJhYmx5IGF3ZnVsLgoKSW4gYWRkaXRpb24gdG8gYWxsIHRoZSBvdGhlciByZWNvbW1lbmRh dGlvbnMsIG9uY2UgdGhlIEJCVSBpcyBpbnN0YWxsZWQsCmRpc2FibGUgdGhlIGluZGl2aWR1YWwg ZHJpdmUgY2FjaGVzIChpZiB0aGlzIGlzbid0IGRvbmUgYXV0b21hdGljYWxseSksCmFuZCBzZXQg dGhlIGNvbnRyb2xsZXIgY2FjaGUgbW9kZSB0byAnd3JpdGUgYmFjaycuICBUaGUgd3JpdGUgdGhy b3VnaAphbmQgZGlyZWN0IEkvTyBjYWNoZSBtb2RlcyB3aWxsIGRlbGl2ZXIgaG9ycmlibGUgUkFJ RDYgd3JpdGUgcGVyZm9ybWFuY2UuCgpBbmQsIEJUVywgUkFJRDYgaXMgYSBob3JyaWJsZSBjaG9p Y2UgZm9yIGEgcGFyYWxsZWwsIHNtYWxsIGZpbGUsIGhpZ2gKcmFuZG9tIEkvTyB3b3JrbG9hZCBz dWNoIGFzIHlvdSd2ZSBkZXNjcmliZWQuICBSQUlEMTAgd291bGQgYmUgbXVjaCBtb3JlCnN1aXRh YmxlLiAgQWN0dWFsbHksIGFueSBzdHJpcGVkIFJBSUQgaXMgbGVzcyB0aGFuIG9wdGltYWwgZm9y IHN1Y2ggYQpzbWFsbCBmaWxlIHdvcmtsb2FkLiAgVGhlIGRlZmF1bHQgc3RyaXBlIHNpemUgZm9y IHRoZSBMU0kgUkFJRApjb250cm9sbGVycywgSUlSQywgaXMgNjRLQi4gIFdpdGggMTQgc3BpbmRs ZXMgb2Ygc3RyaXBlIHdpZHRoIHlvdSBlbmQgdXAKd2l0aCA2NCoxNCA9IDg5NktCLiAgWEZTIHdp bGwgdHJ5IHRvIHBhY2sgYXMgbWFueSBvZiB0aGVzZSA1MC0xNTBLIGZpbGVzCmludG8gYSBzaW5n bGUgZXh0ZW50LCBidXQgeW91J3JlIHRhbGtpbmcgNiB0byAxOCBmaWxlcyBwZXIgZXh0ZW50LCBh bmQKdGhpcyBpcyB3aG9sbHkgZGVwZW5kZW50IG9uIHRoZSBwYXJhbGxlbCB3cml0ZSBwYXR0ZXJu LCBhbmQgaW4gd2hpY2ggb2YKdGhlIGFsbG9jYXRpb24gZ3JvdXBzIFhGUyBkZWNpZGVzIHRvIHdy aXRlIGVhY2ggZmlsZS4gIFhGUyBpc24ndCBnb2luZwp0byBiZSAxMDAlIGVmZmljaWVudCBpbiB0 aGlzIGNhc2UuICBUaHVzLCB5b3Ugd2lsbCBlbmQgdXAgd2l0aCBtYW55CnBhcnRpYWwgc3RyaXBl IHdpZHRoIHdyaXRlcywgZWxpbWluYXRpbmcgbXVjaCBvZiB0aGUgcGVyZm9ybWFuY2UKYWR2YW50 YWdlIG9mIHN0cmlwaW5nLgoKVGhlc2UgYXJlIGxhcmdlIDcyMDAgcnBtIFNBVEEgZHJpdmVzIHdo aWNoIGhhdmUgcG9vciBzZWVrIHBlcmZvcm1hbmNlIHRvCmJlZ2luIHdpdGgsIHVubGlrZSB0aGUg J3NtYWxsJyAzMDBHQiAxNWsgU0FTIGRyaXZlcy4gIFlvdSdyZSByb2JiaW5nCnRoYXQgcG9vciBz ZWVrIHBlcmZvcm1hbmNlIGZ1cnRoZXIgYnk6CgoxLiAgVXNpbmcgZG91YmxlIHBhcml0eSBzdHJp cGVkIFJBSUQKMi4gIFdyaXRpbmcgdGhvdXNhbmRzIG9mIHNtYWxsIGZpbGVzIGluIHBhcmFsbGVs CgpUaGlzIHdvcmtsb2FkIGlzIHZlcnkgc2ltaWxhciB0byB0aGUgY2FzZSBvZiBhIG1haWwgc2Vy dmVyIHVzaW5nIHRoZQptYWlsZGlyIHN0b3JhZ2UgZm9ybWF0LiAgSWYgeW91IHJlYWQgdGhlIGxp c3QgYXJjaGl2ZXMgeW91J2xsIHNlZQpyZWNvbW1lbmRhdGlvbnMgZm9yIGFuIG9wdGltYWwgc3Rv cmFnZSBzdGFjayBzZXR1cCBmb3IgdGhpcyB3b3JrbG9hZC4KSXQgZ29lcyBzb21ldGhpbmcgbGlr ZSB0aGlzOgoKMS4gIENyZWF0ZSBhIGxpbmVhciBhcnJheSBvZiBoYXJkd2FyZSBSQUlEMSBtaXJy b3Igc2V0cy4KICAgIERvIHRoaXMgYWxsIGluIHRoZSBjb250cm9sbGVyIGlmIGl0IGNhbiBkbyBp dC4KICAgIElmIG5vdCwgdXNlIExpbnV4IFJBSUQgKG1kYWRtKSB0byBjcmVhdGUgYSAnLS1saW5l YXInIGFycmF5IG9mIHRoZQogICAgbXVsdGlwbGUgKDcgaW4geW91ciBjYXNlLCBhcHBhcmVudGx5 KSBoYXJkd2FyZSBSQUlEMSBtaXJyb3Igc2V0cwoKMi4gIE5vdyBsZXQgWEZTIGhhbmRsZSB0aGUg d3JpdGUgcGFyYWxsZWxpc20uICBGb3JtYXQgdGhlIHJlc3VsdGluZwogICAgNyBzcGluZGxlIExp bnV4IFJBSUQgZGV2aWNlIHdpdGgsIGZvciBleGFtcGxlOgoKICAgIG1rZnMueGZzIC1kIGFnY291 bnQ9MTQgL2Rldi9tZDAKCkJ5IHVzaW5nIHRoaXMgY29uZmlndXJhdGlvbiB5b3UgZWxpbWluYXRl IHRoZSBleGNlc3NpdmUgaGVhZCBzZWVraW5nCmFzc29jaWF0ZWQgd2l0aCB0aGUgcGFydGlhbCBz dHJpcGUgd3JpdGUgcHJvYmxlbXMgb2YgUkFJRDYsIHJlc3RvcmluZwpwZXJmb3JtYW5jZSBlZmZp Y2llbmN5IHRvIHRoZSBhcnJheS4gIFVzaW5nIDE0IGFsbG9jYXRpb24gZ3JvdXBzIGFsbG93cwpY RlMgdG8gd3JpdGUgd3JpdGUsIGF0IG1pbmltdW0sIDE0IHN1Y2ggZmlsZXMgaW4gcGFyYWxsZWwu ICBUaGlzIG1heSBub3QKc2VlbSBsaWtlIGEgbG90IGdpdmVuIHlvdSBoYXZlIH4yMDAgd3JpdGVy cywgYnV0IGl0J3MgYWN0dWFsbHkgZmFyIG1vcmUKdGhhbiB3aGF0IHlvdSdyZSBnZXR0aW5nIG5v dywgb3Igd2hhdCB5b3UnbGwgZ2V0IHdpdGggc3RyaXBlZCBwYXJpdHkKUkFJRC4gIENvbnNpZGVy IHRoZSAxNTBLQiBmaWxlIGNhc2U6ICAxNCoxNTBLQiA9IDIuMU1CL3MuICBBc3N1bWluZyB0aGlz CmhhcmR3YXJlIGFuZCBzb2Z0d2FyZSBzdGFjayBjYW4gc2luayAyMTBNQi9zIHdpdGggdGhpcyB3 b3JrbG9hZCwgdGhhdCdzCn4xNDAwIGZpbGVzIHdyaXR0ZW4gcGVyIHNlY29uZCwgb3IgODQsMDAw IGZpbGVzIHBlciBob3VyLiAgV291bGQgdGhpcyBiZQpzdWZmaWNpZW50IGZvciB5b3VyIGFwcGxp Y2F0aW9uPwoKTm93IHRoYXQgd2UndmUgY292ZXJlZCB0aGUgWEZTIGFuZCBoYXJkd2FyZSBSQUlE IHNpZGUgb2YgdGhpcyBlcXVhdGlvbiwKZG9lcyB5b3VyIGFwcGxpY2F0aW9uIHJ1biBkaXJlY3Rs eSBvbiB0aGUgdGhpcyBtYWNoaW5lLCBvciBhcmUgeW91CndyaXRpbmcgb3ZlciBORlMgb3IgQ0lG UyB0byB0aGlzIFhGUyBmaWxlc3lzdGVtPyAgSWYgc28sIHRoYXQncyBhbm90aGVyCmZseSBpbiB0 aGUgb2ludG1lbnQgd2UgbWF5IGhhdmUgdG8gZGVhbCB3aXRoLgoKLS0gClN0YW4KCl9fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCnhmcyBtYWlsaW5nIGxpc3QK eGZzQG9zcy5zZ2kuY29tCmh0dHA6Ly9vc3Muc2dpLmNvbS9tYWlsbWFuL2xpc3RpbmZvL3hmcwo=