From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan *St0fF* Huebner Subject: Re: ATA / mvsas issue. Date: Thu, 01 Apr 2010 23:05:22 +0200 Message-ID: <4BB50A92.3030205@gmx.net> References: <53271.87.210.74.220.1270040583.squirrel@ketsers.dhs.org> <7BF8FE1BFB7440B29ECD3D15FB0A4E8C@usish.com.cn> <1068.77.248.79.78.1270102668.squirrel@ketsers.dhs.org> <1543.77.248.79.78.1270108509.squirrel@ketsers.dhs.org> Reply-To: st0ff@npl.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from wega.rz.tu-ilmenau.de ([141.24.4.159]:35069 "EHLO wega.rz.tu-ilmenau.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751233Ab0DAV3H (ORCPT ); Thu, 1 Apr 2010 17:29:07 -0400 In-Reply-To: <1543.77.248.79.78.1270108509.squirrel@ketsers.dhs.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Caspar Smit Cc: jack wang , linux-scsi@vger.kernel.org Am 01.04.2010 09:55, schrieb Caspar Smit: >> >> >>> Hi all, >>> >>> Today I installed 16 fresh Western Digital WD5000BEVT (2,5") drives in >>> one >>> of our test servers. >>> >>> I created a software raid5 with a hotspare on these 16 disks. >>> >>> I noticed that the detection of the disks during boottime was very very >>> slow. >>> Creating the md superblocks went very very slow. >>> >>> After that all seemed fine (speed of the raid5 init was normal). >>> >>> I noticed many of these messages in the syslog (also attached): >>> >>> Mar 31 14:34:17 test ata_id[3752]: main: HDIO_GET_IDENTITY failed for >>> '/dev/.tmp-8-112' >>> Mar 31 14:34:17 test ata_id[3765]: main: HDIO_GET_IDENTITY failed for >>> '/dev/.tmp-8-128' >>> >>> This seems to correspond to the slow detection of the disks. >>> >>> Is this an ATA problem, or a problem in the mvsas driver? >>> >>> I use the mvsas driver from 2.6.32 with the latest patch from Srinivas. >>> >>> Kind regards, >>> Caspar Smit >>> >>> >>> [Jack] It's normal behavior of SATA disk, SATA disk need more time than >>> SAS >>> disk to spin up to response command. >>> >> I use loads of other SATA disks which don't have this behavior. >> >> Caspar >> >> >> [Jack] In my test, some big SATA disks(ie 500G above)have this issues. >> Best Regards >> @Jack: sorry, but that doesn't cause unresponsiveness. Some 2TB SATA-Disks need >10s to spin up, but there shouldn't be any notes/logs like those. As a matter of fact: these 2,5" drives should spin up in a matter of 2s. > Seagate 500G SATA disks are working fine. > Hitachi also. And I've seen WD5000BEVT work great, too. 8 of a kind in a QNAP SS-839 (Atom based NAS with a pretty recent linux on it) work fine! Stefan > Caspar > > >> ************************************************************************ >> Jack Wang >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-scsi" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >