From: Tomasz Chmielewski <mangoo@wpkg.org>
To: Gabor Gombas <gombasg@sztaki.hu>
Cc: Linux IDE <linux-ide@vger.kernel.org>,
Linux-Raid <linux-raid@vger.kernel.org>,
LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: can I freeze I/O for some time to a given disk / md / dm device?
Date: Tue, 16 Dec 2008 17:19:21 +0100 [thread overview]
Message-ID: <4947D509.6080005@wpkg.org> (raw)
In-Reply-To: <20081216161312.GI18423@boogie.lpds.sztaki.hu>
Gabor Gombas schrieb:
> On Tue, Dec 16, 2008 at 01:01:27PM +0100, Tomasz Chmielewski wrote:
>
>> Is it possible to "freeze I/O" for some time to a given disk / md / dm
>> device?
>>
>> Say, "freeze I/O" so that userspace waits for any response for 30, 60
>> seconds or more?
>
> For real disks you can use /sys/block/sdX/device/unload_heads to achieve
> something similar (see Documentation/laptops/disk-shock-protection.txt
> in the kernel source about how to use it). That won't work for md/dm
> devices though.
Thanks, I think I have enough hints now.
Bryn M. Reeves on linux-lvm list suggested using dmsetup's
suspend/resume, which seems to be the easiest way for this purpose
(requires device mapper / LVM).
--
Tomasz Chmielewski
http://wpkg.org
WARNING: multiple messages have this Message-ID (diff)
From: Tomasz Chmielewski <mangoo@wpkg.org>
To: Gabor Gombas <gombasg@sztaki.hu>
Cc: Linux-Raid <linux-raid@vger.kernel.org>,
Linux IDE <linux-ide@vger.kernel.org>,
LVM general discussion and development <linux-lvm@redhat.com>
Subject: [linux-lvm] Re: can I freeze I/O for some time to a given disk / md / dm device?
Date: Tue, 16 Dec 2008 17:19:21 +0100 [thread overview]
Message-ID: <4947D509.6080005@wpkg.org> (raw)
In-Reply-To: <20081216161312.GI18423@boogie.lpds.sztaki.hu>
Gabor Gombas schrieb:
> On Tue, Dec 16, 2008 at 01:01:27PM +0100, Tomasz Chmielewski wrote:
>
>> Is it possible to "freeze I/O" for some time to a given disk / md / dm
>> device?
>>
>> Say, "freeze I/O" so that userspace waits for any response for 30, 60
>> seconds or more?
>
> For real disks you can use /sys/block/sdX/device/unload_heads to achieve
> something similar (see Documentation/laptops/disk-shock-protection.txt
> in the kernel source about how to use it). That won't work for md/dm
> devices though.
Thanks, I think I have enough hints now.
Bryn M. Reeves on linux-lvm list suggested using dmsetup's
suspend/resume, which seems to be the easiest way for this purpose
(requires device mapper / LVM).
--
Tomasz Chmielewski
http://wpkg.org
next prev parent reply other threads:[~2008-12-16 16:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-16 12:01 can I freeze I/O for some time to a given disk / md / dm device? Tomasz Chmielewski
2008-12-16 12:01 ` [linux-lvm] " Tomasz Chmielewski
2008-12-16 12:35 ` Bryn M. Reeves
2008-12-16 12:53 ` Tomasz Chmielewski
2008-12-16 16:13 ` Gabor Gombas
2008-12-16 16:19 ` Tomasz Chmielewski [this message]
2008-12-16 16:19 ` [linux-lvm] " Tomasz Chmielewski
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