* grow MULTIPATH RAID
@ 2011-03-25 3:13 shamim
2011-03-25 5:29 ` NeilBrown
0 siblings, 1 reply; 4+ messages in thread
From: shamim @ 2011-03-25 3:13 UTC (permalink / raw)
To: linux-raid
Hello Experts,
Please help me to grow MULTIPATH RAID.
My problem:
I've Linux box which have MULTIPATH RAID created on them. Now we need to remove
those old LUN and move data onto new LUN presented to those boxes.
My initially thought was to grow the current MULTIPATH RAID (/dev/md0) and
make old LUN as spare and then failed and then remove(Is this a right
approach?). When I’m try adding new LUNs to it, they are getting added as spare
( as shown below). And when I try to grow , it refuse to do so. Below are the
steps that I performed and error message.(Cannot reshaped!!)
( I read somehwere that we can’t grow MULTIPATH RAID, if it is TRUE, then what
would be suggested solution to move data from old LUNs to new LUNs)
Please help
--------------------------------------------------
# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Thu Mar 24 13:54:41 2011
Raid Level : multipath
Array Size : 10486016 (10.00 GiB 10.74 GB)
Raid Devices : 2
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Mar 24 13:54:41 2011
State : clean
Active Devices : 2
Working Devices : 4
Failed Devices : 0
Spare Devices : 2
UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Events : 0.3
Number Major Minor RaidDevice State
0 65 0 0 active sync /dev/sdq
1 8 96 1 active sync /dev/sdg
--------------------------------------------------------------------
# mdadm /dev/md0 --add /dev/sdr /dev/sdh
mdadm: added /dev/sdr
mdadm: re-added /dev/sdh
--------------------------------------------------------------------
# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Thu Mar 24 13:54:41 2011
Raid Level : multipath
Array Size : 10486016 (10.00 GiB 10.74 GB)
Raid Devices : 2
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Mar 24 13:54:41 2011
State : clean
Active Devices : 2
Working Devices : 4
Failed Devices : 0
Spare Devices : 2
UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Events : 0.3
Number Major Minor RaidDevice State
0 65 0 0 active sync /dev/sdq
1 8 96 1 active sync /dev/sdg
2 65 16 - spare /dev/sdr
3 8 112 - spare /dev/sdh
--------------------------------------------------------------------
# mdadm --grow /dev/md0 --raid-disks=4
mdadm: multipath array /dev/md0 cannot be reshaped.
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: grow MULTIPATH RAID
2011-03-25 3:13 grow MULTIPATH RAID shamim
@ 2011-03-25 5:29 ` NeilBrown
2011-03-25 6:06 ` Roberto Spadim
0 siblings, 1 reply; 4+ messages in thread
From: NeilBrown @ 2011-03-25 5:29 UTC (permalink / raw)
To: shamim; +Cc: linux-raid
On Fri, 25 Mar 2011 03:13:41 +0000 (UTC) shamim <shamim_99@yahoo.com> wrote:
> Hello Experts,
>
> Please help me to grow MULTIPATH RAID.
> My problem:
> I've Linux box which have MULTIPATH RAID created on them. Now we need to remove
> those old LUN and move data onto new LUN presented to those boxes.
>
> My initially thought was to grow the current MULTIPATH RAID (/dev/md0) and
> make old LUN as spare and then failed and then remove(Is this a right
> approach?). When I’m try adding new LUNs to it, they are getting added as spare
> ( as shown below). And when I try to grow , it refuse to do so. Below are the
> steps that I performed and error message.(Cannot reshaped!!)
> ( I read somehwere that we can’t grow MULTIPATH RAID, if it is TRUE, then what
> would be suggested solution to move data from old LUNs to new LUNs)
> Please help
No, you cannot grow an md/multipath device.
However you can simply create a new multipath config across
the set of paths that you want to use.
mdadm --stop /dev/md0
mdadm --create /dev/md0 --l multipath -n 4 ..list..of..paths...
However I recommend that you stop using md/multipath and look in to
using dm-multipath instead. See the 'multipath' command.
dm-multipath is actively developed. md/multipath is not.
NeilBrown
> --------------------------------------------------
>
> # mdadm --detail /dev/md0
> /dev/md0:
> Version : 0.90
> Creation Time : Thu Mar 24 13:54:41 2011
> Raid Level : multipath
> Array Size : 10486016 (10.00 GiB 10.74 GB)
> Raid Devices : 2
> Total Devices : 4
> Preferred Minor : 0
> Persistence : Superblock is persistent
>
> Update Time : Thu Mar 24 13:54:41 2011
> State : clean
> Active Devices : 2
> Working Devices : 4
> Failed Devices : 0
> Spare Devices : 2
>
> UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Events : 0.3
>
> Number Major Minor RaidDevice State
> 0 65 0 0 active sync /dev/sdq
> 1 8 96 1 active sync /dev/sdg
> --------------------------------------------------------------------
> # mdadm /dev/md0 --add /dev/sdr /dev/sdh
> mdadm: added /dev/sdr
> mdadm: re-added /dev/sdh
>
> --------------------------------------------------------------------
> # mdadm --detail /dev/md0
> /dev/md0:
> Version : 0.90
> Creation Time : Thu Mar 24 13:54:41 2011
> Raid Level : multipath
> Array Size : 10486016 (10.00 GiB 10.74 GB)
> Raid Devices : 2
> Total Devices : 4
> Preferred Minor : 0
> Persistence : Superblock is persistent
>
> Update Time : Thu Mar 24 13:54:41 2011
> State : clean
> Active Devices : 2
> Working Devices : 4
> Failed Devices : 0
> Spare Devices : 2
>
> UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Events : 0.3
>
> Number Major Minor RaidDevice State
> 0 65 0 0 active sync /dev/sdq
> 1 8 96 1 active sync /dev/sdg
>
> 2 65 16 - spare /dev/sdr
> 3 8 112 - spare /dev/sdh
>
> --------------------------------------------------------------------
> # mdadm --grow /dev/md0 --raid-disks=4
> mdadm: multipath array /dev/md0 cannot be reshaped.
>
>
>
> --
> 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
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: grow MULTIPATH RAID
2011-03-25 5:29 ` NeilBrown
@ 2011-03-25 6:06 ` Roberto Spadim
2011-03-25 6:21 ` NeilBrown
0 siblings, 1 reply; 4+ messages in thread
From: Roberto Spadim @ 2011-03-25 6:06 UTC (permalink / raw)
To: NeilBrown; +Cc: shamim, linux-raid
hum, what diference about dmraid and mdraid? dm and md what's the
diference? (md= multiple devices?! dm=? )
2011/3/25 NeilBrown <neilb@suse.de>:
> On Fri, 25 Mar 2011 03:13:41 +0000 (UTC) shamim <shamim_99@yahoo.com> wrote:
>
>> Hello Experts,
>>
>> Please help me to grow MULTIPATH RAID.
>> My problem:
>> I've Linux box which have MULTIPATH RAID created on them. Now we need to remove
>> those old LUN and move data onto new LUN presented to those boxes.
>>
>> My initially thought was to grow the current MULTIPATH RAID (/dev/md0) and
>> make old LUN as spare and then failed and then remove(Is this a right
>> approach?). When I’m try adding new LUNs to it, they are getting added as spare
>> ( as shown below). And when I try to grow , it refuse to do so. Below are the
>> steps that I performed and error message.(Cannot reshaped!!)
>> ( I read somehwere that we can’t grow MULTIPATH RAID, if it is TRUE, then what
>> would be suggested solution to move data from old LUNs to new LUNs)
>> Please help
>
> No, you cannot grow an md/multipath device.
> However you can simply create a new multipath config across
> the set of paths that you want to use.
>
> mdadm --stop /dev/md0
> mdadm --create /dev/md0 --l multipath -n 4 ..list..of..paths...
>
> However I recommend that you stop using md/multipath and look in to
> using dm-multipath instead. See the 'multipath' command.
>
> dm-multipath is actively developed. md/multipath is not.
>
> NeilBrown
>
>
>> --------------------------------------------------
>>
>> # mdadm --detail /dev/md0
>> /dev/md0:
>> Version : 0.90
>> Creation Time : Thu Mar 24 13:54:41 2011
>> Raid Level : multipath
>> Array Size : 10486016 (10.00 GiB 10.74 GB)
>> Raid Devices : 2
>> Total Devices : 4
>> Preferred Minor : 0
>> Persistence : Superblock is persistent
>>
>> Update Time : Thu Mar 24 13:54:41 2011
>> State : clean
>> Active Devices : 2
>> Working Devices : 4
>> Failed Devices : 0
>> Spare Devices : 2
>>
>> UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> Events : 0.3
>>
>> Number Major Minor RaidDevice State
>> 0 65 0 0 active sync /dev/sdq
>> 1 8 96 1 active sync /dev/sdg
>> --------------------------------------------------------------------
>> # mdadm /dev/md0 --add /dev/sdr /dev/sdh
>> mdadm: added /dev/sdr
>> mdadm: re-added /dev/sdh
>>
>> --------------------------------------------------------------------
>> # mdadm --detail /dev/md0
>> /dev/md0:
>> Version : 0.90
>> Creation Time : Thu Mar 24 13:54:41 2011
>> Raid Level : multipath
>> Array Size : 10486016 (10.00 GiB 10.74 GB)
>> Raid Devices : 2
>> Total Devices : 4
>> Preferred Minor : 0
>> Persistence : Superblock is persistent
>>
>> Update Time : Thu Mar 24 13:54:41 2011
>> State : clean
>> Active Devices : 2
>> Working Devices : 4
>> Failed Devices : 0
>> Spare Devices : 2
>>
>> UUID : xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> Events : 0.3
>>
>> Number Major Minor RaidDevice State
>> 0 65 0 0 active sync /dev/sdq
>> 1 8 96 1 active sync /dev/sdg
>>
>> 2 65 16 - spare /dev/sdr
>> 3 8 112 - spare /dev/sdh
>>
>> --------------------------------------------------------------------
>> # mdadm --grow /dev/md0 --raid-disks=4
>> mdadm: multipath array /dev/md0 cannot be reshaped.
>>
>>
>>
>> --
>> 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
>
> --
> 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
>
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-03-25 6:21 UTC | newest]
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2011-03-25 3:13 grow MULTIPATH RAID shamim
2011-03-25 5:29 ` NeilBrown
2011-03-25 6:06 ` Roberto Spadim
2011-03-25 6:21 ` NeilBrown
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