From mboxrd@z Thu Jan 1 00:00:00 1970 From: Asdo Subject: Re: How to reread disk size? Date: Tue, 23 Feb 2010 19:05:43 +0100 Message-ID: <4B8418F7.2070800@shiftmail.org> References: <4B7F234F.9000107@shiftmail.org> <4B802BDF.9020509@gmail.com> <4B805487.2010900@shiftmail.org> <1266736938.4414.9.camel@mulgrave.site> <4B814B26.5020501@shiftmail.org> <51f3faa71002210910s484c8e4i975ebf2314287d66@mail.gmail.com> <4B81D699.704@shiftmail.org> <1266843472.4414.23.camel@mulgrave.site> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from blade3.isti.cnr.it ([194.119.192.19]:50157 "EHLO BLADE3.ISTI.CNR.IT" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752260Ab0BWSGs (ORCPT ); Tue, 23 Feb 2010 13:06:48 -0500 Received: from conversionlocal.isti.cnr.it by mx.isti.cnr.it (PMDF V6.5-b2 #31825) id <01NK0GWI2GN4BF6VBQ@mx.isti.cnr.it> for linux-ide@vger.kernel.org; Tue, 23 Feb 2010 19:05:43 +0100 In-reply-to: <1266843472.4414.23.camel@mulgrave.site> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: James Bottomley Cc: Robert Hancock , linux-ide@vger.kernel.org James Bottomley wrote: > On Mon, 2010-02-22 at 01:58 +0100, Asdo wrote: > >> Robert Hancock wrote: >> >>> ata_piix doesn't have a way to get automatically notified that the >>> disk has been hotplugged since the chipset doesn't support it in this >>> mode. (The ideal solution would be to switch the controller into AHCI >>> mode, but I don't know if that's possible on that chipset and BIOS.) >>> >>> I think there are some ways to get the code to recheck the disk >>> however.. you can try echoing something into the "rescan" sysfs file >>> under /sys that matches your device (do a "find /sys/ -name >>> scsi_level" to see what directories they're in, the rescan file is in >>> the same directory). >>> >>> >> Thanks for the hint >> It doesn't work unfortunately. >> Echoing something into rescan makes it output (in dmesg) basically the >> same message that comes out with blockdev --rereadpt /dev/sdr. The size >> is still detected wrong. Catting "model" also turns out that the old >> brand of disk still being detected. smartctl -a does show the new disk :-) >> I tried to write "1" in evt_media_change but it's permission denied :-) >> > > Right. libata caches the value from the moment it scans the device. > You might be able to alter it by having the device destroyed and > recreated ... that would be echoing 1 to the delete under the scsi > device sysfs node and then echoing '- - -' to the host rescan parameter. > If that doesn't work, libata will need to be fixed somehow because that > would mean it isn't slaving it's device lifetimes to the SCSI model. > Great, it works! Thank you root@mynode:/sys# echo 1 > /sys/devices/pci0000:00/0000:00:1f.2/host3/target3:0:1/3:0:1:0/delete and then echo "- - -" > /sys/class/scsi_host/host3/scan recreated the device with 1TB size! Acually then I tried to swap disks again and just give the echo "- - -" > /sys/class/scsi_host/host3/scan and it worked already. So deleting the device was not needed. However the "rescan" in the same directory of scsi_level you suggested in previous post did not work. This "scan" in scsi_host is more powerful :-D Thank you