[linux-lvm] drive-spindown

[linux-lvm] drive-spindown

[Michael Frotscher]

Hello, all

I'd like to have the drives of my LVM-system (SuSE 8.0) to spin down 
when the volume is not used (it's a data-volume only, the system 
resides somewhere else). The volume consists of one partition of hda 
and drives hdb and hdc are completely dedicated to it.

I tried to set a spindown-time in BIOS as well as hdparm -S, but 
strangely only hdc powers down (checked that with hdparm -C). I don't 
really expect hda to power down as the system resides on it, but hdb 
obviously should. Does anyone have an idea why it doesn't? 
-- 
cheers,

Michael

Re: [linux-lvm] drive-spindown

[Heinz J . Mauelshagen]

Michael,

that could be either some regular access to extents residing on hdb
or a drive spin down flaw in the IDE driver in case "hdparm -S" went proper.

On Wed, Sep 25, 2002 at 10:11:05AM +0200, Michael Frotscher wrote:
> Hello, all
> 
> I'd like to have the drives of my LVM-system (SuSE 8.0) to spin down 
> when the volume is not used (it's a data-volume only, the system 
> resides somewhere else). The volume consists of one partition of hda 
> and drives hdb and hdc are completely dedicated to it.
> 
> I tried to set a spindown-time in BIOS as well as hdparm -S, but 
> strangely only hdc powers down (checked that with hdparm -C). I don't 
> really expect hda to power down as the system resides on it, but hdb 
> obviously should. Does anyone have an idea why it doesn't? 
> -- 
> cheers,
> 
> Michael
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] drive-spindown

[Michael Frotscher]

On Wednesday 25 September 2002 11:25, Heinz J . Mauelshagen wrote:

> that could be either some regular access to extents residing on hdb

So you are saying that the volume can be used (like accessing hdb) even 
though hdc is spun down? Amazing - I did not know that was possible. 
But if, it is a good explanation as my volume still has plenty of space 
so hdc would not be accessed until hdb is full.
-- 
Cheers,

Michael 

Re: [linux-lvm] drive-spindown

[Heinz J . Mauelshagen]

On Wed, Sep 25, 2002 at 11:51:25AM +0200, Michael Frotscher wrote:
> On Wednesday 25 September 2002 11:25, Heinz J . Mauelshagen wrote:
> 
> > that could be either some regular access to extents residing on hdb
> 
> So you are saying that the volume can be used (like accessing hdb) even 
> though hdc is spun down?

Correct.

If there's just accesses to extents mapped onto hdb (i.e. from the filesystem),
hdc will never spin up (unless somthing outside LVM triggers it ;-)

> But if, it is a good explanation as my volume still has plenty of space 
> so hdc would not be accessed until hdb is full.

See "pvdisplay -v /dev/hd[bc]" or "lvdisplay -v YourLV" for your
logical volume(s) to see what is mapped onto what.

> -- 
> Cheers,
> 
> Michael 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-