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@xxxxxxxxxxxxxxx >> 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@xxxxxxxxxxxxxxx > 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@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
