RE: ATA / mvsas issue.

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> 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


>
> Best Regards
>
> ************************************************************************
> Jack  Wang   Íõ½ðÆÖ                 Software Engineer
>
>
>
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