Re: RAID0 size over 2 TB

[NeilBrown <neilb@suse.de>]

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On Mon, 08 Sep 2014 09:18:11 +0200 "azurIt" <azurit@pobox.sk> wrote:

> >
> > CC: linux-raid@vger.kernel.org
> >On Sat, 06 Sep 2014 23:09:28 +0200 "azurIt" <azurit@pobox.sk> wrote:
> >
> >> Hi,
> >> 
> >> i'm having problems with growing my RAID0 array over 2 TB. I installed two 4 TB drives, created 4 TB partitions but array cannot be resized over 2 TB. Superblock versoin is 0.90 and kernel version is 3.2.53 - according to linux RAID wiki, it should support 4 TB component/array size:
> >> https://raid.wiki.kernel.org/index.php/RAID_superblock_formats#The_version-0.90_Superblock_Format
> >> 
> >> Some more info:
> >> 
> >> # mdadm --detail /dev/md2
> >> /dev/md2:
> >>         Version : 0.90
> >>   Creation Time : Tue Sep 28 16:54:04 2010
> >>      Raid Level : raid1
> >>      Array Size : 2147483520 (2048.00 GiB 2199.02 GB)
> >>   Used Dev Size : 2147483520 (2048.00 GiB 2199.02 GB)
> >>    Raid Devices : 2
> >>   Total Devices : 2
> >> Preferred Minor : 2
> >>     Persistence : Superblock is persistent
> >> 
> >>     Update Time : Sat Sep  6 23:04:44 2014
> >>           State : clean 
> >>  Active Devices : 2
> >> Working Devices : 2
> >>  Failed Devices : 0
> >>   Spare Devices : 0
> >> 
> >>            UUID : 9a363004:ad04abfe:2e31e1c3:caf66df4
> >>          Events : 0.77066
> >> 
> >>     Number   Major   Minor   RaidDevice State
> >>        0       8       33        0      active sync   /dev/sdc1
> >>        1       8       49        1      active sync   /dev/sdd1
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> # fdisk /dev/sdd
> >> 
> >> WARNING: GPT (GUID Partition Table) detected on '/dev/sdd'! The util fdisk doesn't support GPT. Use GNU Parted.
> >
> >Why are you using "fdisk" even though "fdisk" is telling you not to use it?
> >
> >What does
> >  cat /proc/partitions
> >
> >say about the sizes of the partitions?
> >
> >NeilBrown
> >
> 
> 
> 
> I, of course, didn't use fdisk to create partitions - they were created using cgdisk, but it's graphical tool so i wasn't able to send output from it, so i get output from fdisk to prove, that partitions are large enough.

Yet fdisk *didn't* prove that the partitions are large enough - it said the
partitions were:

/dev/sdd1               1  4294967295  2147483647+  ee  GPT
                                       ^^^^^^^^^^^

2 Gig.

And /proc/partitions tells me:

> 
> 
> # cat /proc/partitions
> major minor  #blocks  name
> 
>    9        2 2147483520 md2
>    8       32 3907018584 sdc
>    8       33 2147483647 sdc1
>    8       48 3907018584 sdd
>    8       49 2147483647 sdd1

that the partitions are 2Gig.  You need to sort the partition size out.  I
cannot help you.  I have no experience with GPT.  Maybe a reboot?

NeilBrown

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