md device renaming

md device renaming

[Patrick H.]

So, every time I start up this md device with a specified name, it 
renames itself to something else.

When I first created the array, I typo'd the name as 'nas01:isci-sdb1' 
(should be nas01:iscsi-sdb1). And now every time I assemble it with the 
correct name, it renames itself:

# /sbin/mdadm -A /dev/md/nas01:iscsi-sdb1 --uuid 
abddf4ea:06524e68:8e2b8f4e:1b24c56d -R -U name
mdadm: /dev/md/nas01:iscsi-sdb1 has been started with 2 drives (out of 3)
# ls /dev/md/nas*
/dev/md/nas01:isci-sdb1
# ls /dev/disk/by-id/md-name*
/dev/disk/by-id/md-name-nas01:iscsi-sdb1
# mdadm -D /dev/md/nas01:isci-sdb1|grep Name
           Name : nas01:iscsi-sdb1  (local to host nas01)


So, notice how it says it started it as "nas01:iscsi-sdb1", however once 
its up and I do the `ls`, it has the original name on it. I've tried -U 
name to update the name on it when its assembled, but doesnt do a thing.

Am I missing something here. Shouldnt it be assembling itself with the 
specified name I gave it, not the original name? And then how do I 
update it so the name in the metadata is correct?
(and yes I know its missing a drive, I'm testing some stuff out)

-Patrick

Re: md device renaming

[Neil Brown]

On Sun, 12 Dec 2010 19:37:05 -0700 "Patrick H." <linux-raid@feystorm.net>
wrote:

> So, every time I start up this md device with a specified name, it 
> renames itself to something else.
> 
> When I first created the array, I typo'd the name as 'nas01:isci-sdb1' 
> (should be nas01:iscsi-sdb1). And now every time I assemble it with the 
> correct name, it renames itself:
> 
> # /sbin/mdadm -A /dev/md/nas01:iscsi-sdb1 --uuid 
> abddf4ea:06524e68:8e2b8f4e:1b24c56d -R -U name
> mdadm: /dev/md/nas01:iscsi-sdb1 has been started with 2 drives (out of 3)
> # ls /dev/md/nas*
> /dev/md/nas01:isci-sdb1
> # ls /dev/disk/by-id/md-name*
> /dev/disk/by-id/md-name-nas01:iscsi-sdb1
> # mdadm -D /dev/md/nas01:isci-sdb1|grep Name
>            Name : nas01:iscsi-sdb1  (local to host nas01)
> 
> 
> So, notice how it says it started it as "nas01:iscsi-sdb1", however once 
> its up and I do the `ls`, it has the original name on it. I've tried -U 
> name to update the name on it when its assembled, but doesnt do a thing.
> 
> Am I missing something here. Shouldnt it be assembling itself with the 
> specified name I gave it, not the original name? And then how do I 
> update it so the name in the metadata is correct?
> (and yes I know its missing a drive, I'm testing some stuff out)

It is assembling it with the name you give it, but the name stored in the
metadata is still the old name.
Try adding --update=name to the --assemble command.

NeilBrown

Re: md device renaming

[Patrick H.]

Sent: Sun Dec 12 2010 19:49:20 GMT-0700 (Mountain Standard Time)
From: Neil Brown <neilb@suse.de>
To: Patrick H. <linux-raid@feystorm.net> linux-raid@vger.kernel.org
Subject: Re: md device renaming
> On Sun, 12 Dec 2010 19:37:05 -0700 "Patrick H." <linux-raid@feystorm.net>
> wrote:
>
>   
>> So, every time I start up this md device with a specified name, it 
>> renames itself to something else.
>>
>> When I first created the array, I typo'd the name as 'nas01:isci-sdb1' 
>> (should be nas01:iscsi-sdb1). And now every time I assemble it with the 
>> correct name, it renames itself:
>>
>> # /sbin/mdadm -A /dev/md/nas01:iscsi-sdb1 --uuid 
>> abddf4ea:06524e68:8e2b8f4e:1b24c56d -R -U name
>> mdadm: /dev/md/nas01:iscsi-sdb1 has been started with 2 drives (out of 3)
>> # ls /dev/md/nas*
>> /dev/md/nas01:isci-sdb1
>> # ls /dev/disk/by-id/md-name*
>> /dev/disk/by-id/md-name-nas01:iscsi-sdb1
>> # mdadm -D /dev/md/nas01:isci-sdb1|grep Name
>>            Name : nas01:iscsi-sdb1  (local to host nas01)
>>
>>
>> So, notice how it says it started it as "nas01:iscsi-sdb1", however once 
>> its up and I do the `ls`, it has the original name on it. I've tried -U 
>> name to update the name on it when its assembled, but doesnt do a thing.
>>
>> Am I missing something here. Shouldnt it be assembling itself with the 
>> specified name I gave it, not the original name? And then how do I 
>> update it so the name in the metadata is correct?
>> (and yes I know its missing a drive, I'm testing some stuff out)
>>     
>
> It is assembling it with the name you give it, but the name stored in the
> metadata is still the old name.
> Try adding --update=name to the --assemble command.
>
> NeilBrown
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>   
How is it assembling with the name I gave it? It says 
"/dev/md/nas01:iscsi-sdb1 has been started", but it really is using 
"nas01:isci-sdb1". Even if it is going to use the name I created it 
with, it should say that instead of the name I provided on the assemble 
command.
And I did add the update argument, see the '-U name' option on the end 
of the command above.

Re: md device renaming

[Neil Brown]

On Sun, 12 Dec 2010 19:53:22 -0700 "Patrick H." <linux-raid@feystorm.net>
wrote:

> Sent: Sun Dec 12 2010 19:49:20 GMT-0700 (Mountain Standard Time)
> From: Neil Brown <neilb@suse.de>
> To: Patrick H. <linux-raid@feystorm.net> linux-raid@vger.kernel.org
> Subject: Re: md device renaming
> > On Sun, 12 Dec 2010 19:37:05 -0700 "Patrick H." <linux-raid@feystorm.net>
> > wrote:
> >
> >   
> >> So, every time I start up this md device with a specified name, it 
> >> renames itself to something else.
> >>
> >> When I first created the array, I typo'd the name as 'nas01:isci-sdb1' 
> >> (should be nas01:iscsi-sdb1). And now every time I assemble it with the 
> >> correct name, it renames itself:
> >>
> >> # /sbin/mdadm -A /dev/md/nas01:iscsi-sdb1 --uuid 
> >> abddf4ea:06524e68:8e2b8f4e:1b24c56d -R -U name
> >> mdadm: /dev/md/nas01:iscsi-sdb1 has been started with 2 drives (out of 3)
> >> # ls /dev/md/nas*
> >> /dev/md/nas01:isci-sdb1
> >> # ls /dev/disk/by-id/md-name*
> >> /dev/disk/by-id/md-name-nas01:iscsi-sdb1
> >> # mdadm -D /dev/md/nas01:isci-sdb1|grep Name
> >>            Name : nas01:iscsi-sdb1  (local to host nas01)
> >>
> >>
> >> So, notice how it says it started it as "nas01:iscsi-sdb1", however once 
> >> its up and I do the `ls`, it has the original name on it. I've tried -U 
> >> name to update the name on it when its assembled, but doesnt do a thing.
> >>
> >> Am I missing something here. Shouldnt it be assembling itself with the 
> >> specified name I gave it, not the original name? And then how do I 
> >> update it so the name in the metadata is correct?
> >> (and yes I know its missing a drive, I'm testing some stuff out)
> >>     
> >
> > It is assembling it with the name you give it, but the name stored in the
> > metadata is still the old name.
> > Try adding --update=name to the --assemble command.
> >
> > NeilBrown
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >   
> How is it assembling with the name I gave it? It says 
> "/dev/md/nas01:iscsi-sdb1 has been started", but it really is using 
> "nas01:isci-sdb1". Even if it is going to use the name I created it 
> with, it should say that instead of the name I provided on the assemble 
> command.
> And I did add the update argument, see the '-U name' option on the end 
> of the command above.


Sorry, I obviously didn't read properly...
It must be getting the old name from somewhere.
I would
 - stop the array
 - use "mdadm -E" to examine each device and see what name is recorded.
 - look in /etc/mdadm.conf to see what name is there.
 - check /dev/.mdadm/map or possible /var/run/mdadm/map to see if the
   array is mentioned in there (it shouldn't be).

to find out where the old name still is.  Then at least you know what needs
fixing.
Just for completeness: what version of mdadm are you using?

NeilBrown

Re: md device renaming

[Patrick H.]

Sent: Sun Dec 12 2010 20:13:47 GMT-0700 (Mountain Standard Time)
From: Neil Brown <neilb@suse.de>
To: Patrick H. <linux-raid@feystorm.net> linux-raid@vger.kernel.org
Subject: Re: md device renaming
> Sorry, I obviously didn't read properly...
> It must be getting the old name from somewhere.
> I would
>  - stop the array
>  - use "mdadm -E" to examine each device and see what name is recorded.
>  - look in /etc/mdadm.conf to see what name is there.
>  - check /dev/.mdadm/map or possible /var/run/mdadm/map to see if the
>    array is mentioned in there (it shouldn't be).
>
> to find out where the old name still is.  Then at least you know what needs
> fixing.
> Just for completeness: what version of mdadm are you using?
>
> NeilBrown
>   
At the bottom is the output from the `mdadm -E` after stopping the 
array. None of them say anything about the old name
I'm not using mdadm.conf. This is part of a HA cluster, so I'm trying 
not to keep any info in local files, but all in the HA software 
(pacemaker). The only thing in mdadm.conf is "MAILADDR root" and "AUTO -all"
/dev/.mdadm/ is completely empty, and /var/run/mdadm/map doesnt exist 
either (just a pid file in that dir)

# mdadm --version
mdadm - v3.1.3 - 6th August 2010
# uname -r
2.6.32-71.el6.x86_64


The first 2 disks are the ones that ended up in the array. The third 
disk is one I failed out so its not in it

# mdadm -E 
/dev/disk/by-path/ip-165.212.101.241\:3260-iscsi-iqn.165.212.101.240\:nas01.sdb1-lun-1
/dev/disk/by-path/ip-165.212.101.241:3260-iscsi-iqn.165.212.101.240:nas01.sdb1-lun-1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
           Name : nas01:126  (local to host nas01)
  Creation Time : Thu Dec  9 20:41:53 2010
     Raid Level : raid5
   Raid Devices : 3

 Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
     Array Size : 1048064 (511.84 MiB 536.61 MB)
    Data Offset : 224 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : c38615d5:53c09e0c:33160bea:237031fd

    Update Time : Mon Dec 13 03:28:28 2010
       Checksum : 7e6f1bdd - correct
         Events : 4321

         Layout : left-symmetric
     Chunk Size : 128K

   Device Role : Active device 0
   Array State : AA. ('A' == active, '.' == missing)

2010/12/13 03:28:35
root@nas01 /etc/syslog-ng # mdadm -E 
/dev/disk/by-path/ip-165.212.101.242\:3260-iscsi-iqn.165.212.101.240\:nas02.sdb1-lun-1
/dev/disk/by-path/ip-165.212.101.242:3260-iscsi-iqn.165.212.101.240:nas02.sdb1-lun-1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
           Name : nas01:126  (local to host nas01)
  Creation Time : Thu Dec  9 20:41:53 2010
     Raid Level : raid5
   Raid Devices : 3

 Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
     Array Size : 1048064 (511.84 MiB 536.61 MB)
    Data Offset : 224 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : aab5bf73:94242880:8d28b333:f0c88918

    Update Time : Mon Dec 13 03:28:39 2010
       Checksum : f5a31a3a - correct
         Events : 4325

         Layout : left-symmetric
     Chunk Size : 128K

   Device Role : Active device 1
   Array State : AA. ('A' == active, '.' == missing)

# mdadm -E 
/dev/disk/by-path/ip-165.212.101.243\:3260-iscsi-iqn.165.212.101.240\:nas03.sdb1-lun-1
/dev/disk/by-path/ip-165.212.101.243:3260-iscsi-iqn.165.212.101.240:nas03.sdb1-lun-1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
           Name : nas01:iscsi-sdb1  (local to host nas01)
  Creation Time : Thu Dec  9 20:41:53 2010
     Raid Level : raid5
   Raid Devices : 3

 Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
     Array Size : 1048064 (511.84 MiB 536.61 MB)
    Data Offset : 224 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 78faaa98:22154538:aeeab927:19a62875

    Update Time : Mon Dec 13 03:03:18 2010
       Checksum : c358be3f - correct
         Events : 3731

         Layout : left-symmetric
     Chunk Size : 128K

   Device Role : Active device 2
   Array State : AAA ('A' == active, '.' == missing)

Re: md device renaming

[Patrick H.]

Sent: Sun Dec 12 2010 20:37:56 GMT-0700 (Mountain Standard Time)
From: Patrick H. <linux-raid@feystorm.net>
To: no To-header on input <unlisted-recipients:;> linux-raid@vger.kernel.org
Subject: Re: md device renaming
> Sent: Sun Dec 12 2010 20:13:47 GMT-0700 (Mountain Standard Time)
> From: Neil Brown <neilb@suse.de>
> To: Patrick H. <linux-raid@feystorm.net> linux-raid@vger.kernel.org
> Subject: Re: md device renaming
>> Sorry, I obviously didn't read properly...
>> It must be getting the old name from somewhere.
>> I would
>>  - stop the array
>>  - use "mdadm -E" to examine each device and see what name is recorded.
>>  - look in /etc/mdadm.conf to see what name is there.
>>  - check /dev/.mdadm/map or possible /var/run/mdadm/map to see if the
>>    array is mentioned in there (it shouldn't be).
>>
>> to find out where the old name still is.  Then at least you know what 
>> needs
>> fixing.
>> Just for completeness: what version of mdadm are you using?
>>
>> NeilBrown
>>   
> At the bottom is the output from the `mdadm -E` after stopping the 
> array. None of them say anything about the old name
> I'm not using mdadm.conf. This is part of a HA cluster, so I'm trying 
> not to keep any info in local files, but all in the HA software 
> (pacemaker). The only thing in mdadm.conf is "MAILADDR root" and "AUTO 
> -all"
> /dev/.mdadm/ is completely empty, and /var/run/mdadm/map doesnt exist 
> either (just a pid file in that dir)
>
> # mdadm --version
> mdadm - v3.1.3 - 6th August 2010
> # uname -r
> 2.6.32-71.el6.x86_64
>
>
> The first 2 disks are the ones that ended up in the array. The third 
> disk is one I failed out so its not in it
>
> # mdadm -E 
> /dev/disk/by-path/ip-165.212.101.241\:3260-iscsi-iqn.165.212.101.240\:nas01.sdb1-lun-1 
>
> /dev/disk/by-path/ip-165.212.101.241:3260-iscsi-iqn.165.212.101.240:nas01.sdb1-lun-1: 
>
>          Magic : a92b4efc
>        Version : 1.2
>    Feature Map : 0x0
>     Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
>           Name : nas01:126  (local to host nas01)
>  Creation Time : Thu Dec  9 20:41:53 2010
>     Raid Level : raid5
>   Raid Devices : 3
>
> Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
>     Array Size : 1048064 (511.84 MiB 536.61 MB)
>    Data Offset : 224 sectors
>   Super Offset : 8 sectors
>          State : clean
>    Device UUID : c38615d5:53c09e0c:33160bea:237031fd
>
>    Update Time : Mon Dec 13 03:28:28 2010
>       Checksum : 7e6f1bdd - correct
>         Events : 4321
>
>         Layout : left-symmetric
>     Chunk Size : 128K
>
>   Device Role : Active device 0
>   Array State : AA. ('A' == active, '.' == missing)
>
> 2010/12/13 03:28:35
> root@nas01 /etc/syslog-ng # mdadm -E 
> /dev/disk/by-path/ip-165.212.101.242\:3260-iscsi-iqn.165.212.101.240\:nas02.sdb1-lun-1 
>
> /dev/disk/by-path/ip-165.212.101.242:3260-iscsi-iqn.165.212.101.240:nas02.sdb1-lun-1: 
>
>          Magic : a92b4efc
>        Version : 1.2
>    Feature Map : 0x0
>     Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
>           Name : nas01:126  (local to host nas01)
>  Creation Time : Thu Dec  9 20:41:53 2010
>     Raid Level : raid5
>   Raid Devices : 3
>
> Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
>     Array Size : 1048064 (511.84 MiB 536.61 MB)
>    Data Offset : 224 sectors
>   Super Offset : 8 sectors
>          State : clean
>    Device UUID : aab5bf73:94242880:8d28b333:f0c88918
>
>    Update Time : Mon Dec 13 03:28:39 2010
>       Checksum : f5a31a3a - correct
>         Events : 4325
>
>         Layout : left-symmetric
>     Chunk Size : 128K
>
>   Device Role : Active device 1
>   Array State : AA. ('A' == active, '.' == missing)
>
> # mdadm -E 
> /dev/disk/by-path/ip-165.212.101.243\:3260-iscsi-iqn.165.212.101.240\:nas03.sdb1-lun-1 
>
> /dev/disk/by-path/ip-165.212.101.243:3260-iscsi-iqn.165.212.101.240:nas03.sdb1-lun-1: 
>
>          Magic : a92b4efc
>        Version : 1.2
>    Feature Map : 0x0
>     Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
>           Name : nas01:iscsi-sdb1  (local to host nas01)
>  Creation Time : Thu Dec  9 20:41:53 2010
>     Raid Level : raid5
>   Raid Devices : 3
>
> Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
>     Array Size : 1048064 (511.84 MiB 536.61 MB)
>    Data Offset : 224 sectors
>   Super Offset : 8 sectors
>          State : clean
>    Device UUID : 78faaa98:22154538:aeeab927:19a62875
>
>    Update Time : Mon Dec 13 03:03:18 2010
>       Checksum : c358be3f - correct
>         Events : 3731
>
>         Layout : left-symmetric
>     Chunk Size : 128K
>
>   Device Role : Active device 2
>   Array State : AAA ('A' == active, '.' == missing)
>
>
> -- 
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Well, I just re-assembled the array after I stopped it to get the `mdadm 
-E` data, and now the /dev/md/ entry is named correctly. I guess I just 
had to stop it and reassemble it after doing the '-U name'. Still think 
that might be a bug though that it says "/dev/md/nas01:iscsi-sdb1 has 
been started" but it really called it something else.

Re: md device renaming

[Neil Brown]

On Sun, 12 Dec 2010 20:37:56 -0700 "Patrick H." <linux-raid@feystorm.net>
wrote:

> Sent: Sun Dec 12 2010 20:13:47 GMT-0700 (Mountain Standard Time)
> From: Neil Brown <neilb@suse.de>
> To: Patrick H. <linux-raid@feystorm.net> linux-raid@vger.kernel.org
> Subject: Re: md device renaming
> > Sorry, I obviously didn't read properly...
> > It must be getting the old name from somewhere.
> > I would
> >  - stop the array
> >  - use "mdadm -E" to examine each device and see what name is recorded.
> >  - look in /etc/mdadm.conf to see what name is there.
> >  - check /dev/.mdadm/map or possible /var/run/mdadm/map to see if the
> >    array is mentioned in there (it shouldn't be).
> >
> > to find out where the old name still is.  Then at least you know what needs
> > fixing.
> > Just for completeness: what version of mdadm are you using?
> >
> > NeilBrown
> >   
> At the bottom is the output from the `mdadm -E` after stopping the 
> array. None of them say anything about the old name
> I'm not using mdadm.conf. This is part of a HA cluster, so I'm trying 
> not to keep any info in local files, but all in the HA software 
> (pacemaker). The only thing in mdadm.conf is "MAILADDR root" and "AUTO -all"
> /dev/.mdadm/ is completely empty, and /var/run/mdadm/map doesnt exist 
> either (just a pid file in that dir)
> 
> # mdadm --version
> mdadm - v3.1.3 - 6th August 2010
> # uname -r
> 2.6.32-71.el6.x86_64
> 
> 
> The first 2 disks are the ones that ended up in the array. The third 
> disk is one I failed out so its not in it

Thanks.. that should be enough for me to go on.  It doesn't make sense at
all, but hopefully some experimentation will make it all clear to me.  I'll
let you know what I find.

NeilBrown


> 
> # mdadm -E 
> /dev/disk/by-path/ip-165.212.101.241\:3260-iscsi-iqn.165.212.101.240\:nas01.sdb1-lun-1
> /dev/disk/by-path/ip-165.212.101.241:3260-iscsi-iqn.165.212.101.240:nas01.sdb1-lun-1:
>           Magic : a92b4efc
>         Version : 1.2
>     Feature Map : 0x0
>      Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
>            Name : nas01:126  (local to host nas01)
>   Creation Time : Thu Dec  9 20:41:53 2010
>      Raid Level : raid5
>    Raid Devices : 3
> 
>  Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
>      Array Size : 1048064 (511.84 MiB 536.61 MB)
>     Data Offset : 224 sectors
>    Super Offset : 8 sectors
>           State : clean
>     Device UUID : c38615d5:53c09e0c:33160bea:237031fd
> 
>     Update Time : Mon Dec 13 03:28:28 2010
>        Checksum : 7e6f1bdd - correct
>          Events : 4321
> 
>          Layout : left-symmetric
>      Chunk Size : 128K
> 
>    Device Role : Active device 0
>    Array State : AA. ('A' == active, '.' == missing)
> 
> 2010/12/13 03:28:35
> root@nas01 /etc/syslog-ng # mdadm -E 
> /dev/disk/by-path/ip-165.212.101.242\:3260-iscsi-iqn.165.212.101.240\:nas02.sdb1-lun-1
> /dev/disk/by-path/ip-165.212.101.242:3260-iscsi-iqn.165.212.101.240:nas02.sdb1-lun-1:
>           Magic : a92b4efc
>         Version : 1.2
>     Feature Map : 0x0
>      Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
>            Name : nas01:126  (local to host nas01)
>   Creation Time : Thu Dec  9 20:41:53 2010
>      Raid Level : raid5
>    Raid Devices : 3
> 
>  Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
>      Array Size : 1048064 (511.84 MiB 536.61 MB)
>     Data Offset : 224 sectors
>    Super Offset : 8 sectors
>           State : clean
>     Device UUID : aab5bf73:94242880:8d28b333:f0c88918
> 
>     Update Time : Mon Dec 13 03:28:39 2010
>        Checksum : f5a31a3a - correct
>          Events : 4325
> 
>          Layout : left-symmetric
>      Chunk Size : 128K
> 
>    Device Role : Active device 1
>    Array State : AA. ('A' == active, '.' == missing)
> 
> # mdadm -E 
> /dev/disk/by-path/ip-165.212.101.243\:3260-iscsi-iqn.165.212.101.240\:nas03.sdb1-lun-1
> /dev/disk/by-path/ip-165.212.101.243:3260-iscsi-iqn.165.212.101.240:nas03.sdb1-lun-1:
>           Magic : a92b4efc
>         Version : 1.2
>     Feature Map : 0x0
>      Array UUID : abddf4ea:06524e68:8e2b8f4e:1b24c56d
>            Name : nas01:iscsi-sdb1  (local to host nas01)
>   Creation Time : Thu Dec  9 20:41:53 2010
>      Raid Level : raid5
>    Raid Devices : 3
> 
>  Avail Dev Size : 524032 (255.92 MiB 268.30 MB)
>      Array Size : 1048064 (511.84 MiB 536.61 MB)
>     Data Offset : 224 sectors
>    Super Offset : 8 sectors
>           State : clean
>     Device UUID : 78faaa98:22154538:aeeab927:19a62875
> 
>     Update Time : Mon Dec 13 03:03:18 2010
>        Checksum : c358be3f - correct
>          Events : 3731
> 
>          Layout : left-symmetric
>      Chunk Size : 128K
> 
>    Device Role : Active device 2
>    Array State : AAA ('A' == active, '.' == missing)
> 
> 
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