Script to save array info

Script to save array info

[Wakko Warner]

After reading some of the stories about lost metadata, I was wondering if
anyone had a script that would output the member info for each device with
the device's physical serial number.

For a crude one I did this while in /sys/block:
for x in sd*;do
	echo /dev/$x
	/lib/udev/scsi_id --export --page=0x80 --whitelisted /dev/$x
	mdadm -E /dev/$x
done

And saved the output.  It works for me because all but 3 of my raid members
are full disks.

-- 
 Microsoft has beaten Volkswagen's world record.  Volkswagen only created 21
 million bugs.

Re: Script to save array info

[Phil Turmel]

On 06/21/2012 01:21 AM, Wakko Warner wrote:
> After reading some of the stories about lost metadata, I was wondering if
> anyone had a script that would output the member info for each device with
> the device's physical serial number.
> 
> For a crude one I did this while in /sys/block:
> for x in sd*;do
> 	echo /dev/$x
> 	/lib/udev/scsi_id --export --page=0x80 --whitelisted /dev/$x
> 	mdadm -E /dev/$x
> done
> 
> And saved the output.  It works for me because all but 3 of my raid members
> are full disks.

You might try "lsdrv"[1].  It reports the entire block storage tree
starting from real devices with serial numbers.  I tuck away a copy any
time I change a server's drive setup.

Phil

[1] http://github.com/pturmel/lsdrv

Re: Script to save array info

[Jose Manuel dos Santos Calhariz]

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On Wed, Jun 20, 2012 at 07:21:49PM -0400, Wakko Warner wrote:
> After reading some of the stories about lost metadata, I was wondering if
> anyone had a script that would output the member info for each device with
> the device's physical serial number.
> 
> For a crude one I did this while in /sys/block:
> for x in sd*;do
> 	echo /dev/$x
> 	/lib/udev/scsi_id --export --page=0x80 --whitelisted /dev/$x
> 	mdadm -E /dev/$x
> done
> 
> And saved the output.  It works for me because all but 3 of my raid members
> are full disks.
> 

I made a script for myself, that collects the information by
inspecting /sys instead of doing mdadm -E.  The script see all mdraid
devices and all devices that belong to a mdraid.  I would like to know
if the script works or not.  It works for me.



#!/bin/bash

# $1 - procfile
# $2 - File to log
function cat-file () {
    echo $1 >> $2
    if [ -e $1 ] ; then
        ${CAT} $1 >> $2
    else
        echo "$1 don't exist" >> $2
    fi
    echo >> $2
}


FILEMD=md-list

echo "Get slot positions of the devices in mdraid" >> ${FILEMD}
for file in /sys/block/md* ; do
    echo $file    >> ${FILEMD}
    for dev in $file/md/rd* ; do
        echo $dev    >> ${FILEMD}
        ls -alF $dev >> ${FILEMD}
    done
    echo >> ${FILEMD}
done

echo "Get more info about devices in mdraid" >> ${FILEMD}
# get info about all devices that are in a mdraid.
# similar to mdadm --examine ?
for file in /sys/block/md* ; do
    echo $file    >> ${FILEMD}
    for dev in $file/md/rd* ; do
        echo $dev    >> ${FILEMD}
        ls -alF $dev >> ${FILEMD}
        for fi in $dev/* ; do
            if test `basename $fi` = "block"; then
                ls -alF $fi >> ${FILEMD}
            else
                cat-file $fi ${FILEMD}
            fi
        done
        echo >> ${FILEMD}
    done
    echo >> ${FILEMD}
done



-- 
--

     Jose Calhariz

A coisa mais difícil de entender no mundo é o imposto de renda

--Albert Einstein

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Re: Script to save array info

[Wakko Warner]

Jose Manuel dos Santos Calhariz wrote:
> On Wed, Jun 20, 2012 at 07:21:49PM -0400, Wakko Warner wrote:
> > After reading some of the stories about lost metadata, I was wondering if
> > anyone had a script that would output the member info for each device with
> > the device's physical serial number.
> > 
> > For a crude one I did this while in /sys/block:
> > for x in sd*;do
> > 	echo /dev/$x
> > 	/lib/udev/scsi_id --export --page=0x80 --whitelisted /dev/$x
> > 	mdadm -E /dev/$x
> > done
> > 
> > And saved the output.  It works for me because all but 3 of my raid members
> > are full disks.
> 
> I made a script for myself, that collects the information by
> inspecting /sys instead of doing mdadm -E.  The script see all mdraid
> devices and all devices that belong to a mdraid.  I would like to know
> if the script works or not.  It works for me.

I've looked into /sys/block/md*/md before.  I've noticed there is
information not present in the output.

I just checked.  About the only thing important to me would be the "name"
that mdadm -E lists.  I don't know how important UUIDs would be but it could
be.

Looks like your script does essentially this one liner:
find /sys/block/md*/md -type f | xargs grep .

I didn't run it though.  I think yours added the ls -l of the rdX/block/
link.
I looked through everything in the block for some of my devices and none had
the serial number.  I had to use scsi_id from udev to get it.

One thing you might want to do to yours is "exec >> ${FILEMD}" instead of all
the >> ${FILEMD} that you had in your file.

-- 
 Microsoft has beaten Volkswagen's world record.  Volkswagen only created 22
 million bugs.

Re: Script to save array info

[Jose Manuel dos Santos Calhariz]

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On Thu, Jun 21, 2012 at 05:37:00PM -0400, Wakko Warner wrote:
> Jose Manuel dos Santos Calhariz wrote:
> > On Wed, Jun 20, 2012 at 07:21:49PM -0400, Wakko Warner wrote:
> > > After reading some of the stories about lost metadata, I was wondering if
> > > anyone had a script that would output the member info for each device with
> > > the device's physical serial number.
> > > 
> > > For a crude one I did this while in /sys/block:
> > > for x in sd*;do
> > > 	echo /dev/$x
> > > 	/lib/udev/scsi_id --export --page=0x80 --whitelisted /dev/$x
> > > 	mdadm -E /dev/$x
> > > done
> > > 
> > > And saved the output.  It works for me because all but 3 of my raid members
> > > are full disks.
> > 
> > I made a script for myself, that collects the information by
> > inspecting /sys instead of doing mdadm -E.  The script see all mdraid
> > devices and all devices that belong to a mdraid.  I would like to know
> > if the script works or not.  It works for me.
> 
> I've looked into /sys/block/md*/md before.  I've noticed there is
> information not present in the output.
> 
> I just checked.  About the only thing important to me would be the "name"
> that mdadm -E lists.  I don't know how important UUIDs would be but it could
> be.
> 
> Looks like your script does essentially this one liner:
> find /sys/block/md*/md -type f | xargs grep .
> 
> I didn't run it though.  I think yours added the ls -l of the rdX/block/
> link.
> I looked through everything in the block for some of my devices and none had
> the serial number.  I had to use scsi_id from udev to get it.

Good points, my script is a fragment of a bigger script to collect
information about a system.  In my bigger script:

  - I get the UUID of the raid by running "mdadm --detail" for all
  /dev/md*. 

  - I get the serial number by running "smartctl -a" for all disks and
  collect health information too.

> 
> One thing you might want to do to yours is "exec >> ${FILEMD}" instead of all
> the >> ${FILEMD} that you had in your file.
> 

     Jose Calhariz

-- 
--

Ambição: um supremo desejo de ser vilipendiado por seus inimigos enquanto você está vivo e ser ridicularizado pelos amigos quando estiver morto

--Ambrose Bierce

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