linux-kernel - 2.6.18-rc2, problem to wake up spinned down drive?

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Date:	Sun, 30 Jul 2006 14:01:02 +0200
From:	Harald Dunkel <harald.dunkel@...nline.de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: 2.6.18-rc2, problem to wake up spinned down drive?

Hi folks,

I tried to spin down my harddisk using hdparm, but when it is
supposed to spin up again, then it is blocked for quite some
time. dmesg says:

ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
ata1.00: (BMDMA stat 0x20)
ata1.00: tag 0 cmd 0xca Emask 0x4 stat 0x40 err 0x0 (timeout)
ata1: port is slow to respond, please be patient
ata1: port failed to respond (30 secs)
ata1: soft resetting port
ata1.00: configured for UDMA/133
ata1: EH complete
SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back

The disk is a SAMSUNG SP1614C.

On another machine (with a SAMSUNG SP2504C inside) there is no
such problem: The disk is back after just a few seconds.

Is there some trick to wake up the disk a little bit faster?

Regards

Harri

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