From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: IO failures with SMR drives at latest kernel versions Date: Mon, 24 Aug 2015 08:15:15 +0200 Message-ID: <55DAB673.10903@suse.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mx2.suse.de ([195.135.220.15]:50614 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751475AbbHXGPR (ORCPT ); Mon, 24 Aug 2015 02:15:17 -0400 In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Anatol Pomozov , Linux SCSI List Cc: hch@lst.de, Tejun Heo On 08/22/2015 07:23 PM, Anatol Pomozov wrote: > Hi >=20 > On Fri, Aug 21, 2015 at 10:37 PM, Anatol Pomozov > wrote: >> Discs are from different batches and I was a bit surprised to see >> identical failures at the same time. I was ready send the drives to >> RMA but then I discovered this thread >> https://bbs.archlinux.org/viewtopic.php?id=3D199351 A lot of people >> report the same problem as mine. It was found that the problem appea= rs >> only starting from 3.19, with kernel 3.18 or Windows these drives wo= rk >> fine. It is recommended to revert this change >> 9162c6579bf90b3f5ddb7e3a6c6fa946c1b4cbeb "libata: Implement >> ATA_DEV_ZAC" that seems fixes the issue. >=20 > I looked at this commit and it actually adds SMR support to SCSI > layer. Reverting ATA_DEV_ZAC means going back to zones-unaware > algorithms. It is suboptimal but still much better than IO failures > and "BTRFS: lost page write due to I/O error on /dev/sdc" errors I se= e > at my computer. >=20 > If this SMR support is considered as non-stable, can we at least get = a > kernel boot (or config) option that disables ZAC? >=20 Again: Has anybody actually _tested_ that reverting this patch fixes this issue? Or even a proper bisect? Needless to say, my drives work without issues, so I can't really reproduce this issue. Which disks are these? Cheers, Hannes --=20 Dr. Hannes Reinecke zSeries & Storage hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=C3=BCrnberg GF: F. Imend=C3=B6rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N=C3=BCrnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html