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Old 02-04-2015, 03:10 AM   #1
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Map allocated space from Storage device to existing partition

Dear Team,

i just received some new space from storage and verified it is allocated on the server by multipath command. now i want to resize the existing partition. Please help me for the same.

below is the multipath command output

multipath -ll
app2 (360060e80105ed650057075f500000011) dm-2 HITACHI,DF600F
\_ round-robin 0 [prio=2][active]
\_ 1:0:1:17 sdf 8:80 [active][ready]
\_ 2:0:1:17 sdi 8:128 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:0:17 sdg 8:96 [active][ready]
\_ 2:0:0:17 sdh 8:112 [active][ready]
app1 (360060e80105ed650057075f50000000a) dm-0 HITACHI,DF600F
\_ round-robin 0 [prio=2][active]
\_ 1:0:0:10 sdb 8:16 [active][ready]
\_ 2:0:0:10 sdd 8:48 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 1:0:1:10 sdc 8:32 [active][ready]
\_ 2:0:1:10 sde 8:64 [active][ready]

Here 600 GB is already applied and i want to add more 400 GB on the same existing partition.

below is the partition details.

df -kh
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 97G 9.9G 82G 11% /
/dev/sda5 49G 180M 46G 1% /backup
/dev/sda2 97G 21G 72G 23% /opt
/dev/sda1 99M 12M 83M 13% /boot
tmpfs 16G 0 16G 0% /dev/shm
/dev/mapper/app1p1 591G 117G 445G 21% /app

ls /dev/mapper/
app1 app1p1 app2 control

Please guide me how i can add 400GB space in same 600 GB (/app) partition.

Many Thanks !!
Jignesh Dholakiya
Old 02-04-2015, 08:49 PM   #2
Registered: Apr 2004
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In my limited knowledge this could be tricky if you want to keep your existing data on that 600G partition intact.
You should be using LVM for this type of as its very easy to extend, shrink and add more capacity to partitions as your needs grow.
What file system do you have currently on that 600G partition?

One way out of this may be to boot into a rescue CD and with parition magic extend your partition, although you may have issues getting these mounted in that environment.
Old 02-08-2015, 12:28 AM   #3
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Dear Ulto,

Thanks for your update.

should i refer below URL for the re size partition ?
Old 02-09-2015, 11:10 PM   #4
Registered: Apr 2004
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By all means try it but make sure you have a backup of your data.

The thing I am not sure of is if the procedure you outlined, will resize a disk that is already added to the server, or whether that you want to merge two multipath devices to the one 'map' partition.
Old 02-09-2015, 11:15 PM   #5
Registered: Apr 2004
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Let us know how you get on as I would be interested myself.
Old 02-18-2015, 07:08 PM   #6
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Short answer: you can't. What you can do is dump/tar the filesystem, build a new LVM2 volume group from the two LUNs, then carve out a logical volume of the desired size and restore the data you backed up.

The lazysystemadmin and RH URIs are not relevant in your case. Those are referring to a LUN that's been resized on the back end. You, instead, have two separate LUNs.


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