Re: [CentOS] 2 TB limit on USB drive

[Todd Denniston]

Gareth Tupper wrote, On 11/16/2009 03:12 PM:
> Hallo
>  
> I submitted this as a bug several weeks ago, but I wanted to ask around
> & see if anyone else has come across this
what BZ and #? (mainly out of curiosity, but not enough to override the 
laziness of not wanting to 
check 2 different BZs)
>  
>   I have a USB Buffalo Drivestation Quattro, with 4 1TB disks
> configured in raid5 as one 2.8TB (or so) disk, attached to a Cent 5.4 64
> bit server (completely yum'd up to date)
> 

> After this failure, the disk is either a) inaccessible, or b) reports
> only a 2 TB partition.
> 

> [r...@myserver ~]# cat /proc/partitions
> major minor #blocks name
>...
>8 32 2147483648 sdc << the disk showing incorrectly with only 2TB of
> storage
>  
> This bug seems very similar to a previous bug:
> https://bugzilla.redhat.com/show_bug.cgi?id=502944 which was reported
> fixed in 5.4 
>  
> Anyone seen this before, or have any ideas how I can get CentOS to see
> the disk?
>  

ideas:
A1) figure out how much more/less than
http://www.linuxhq.com/kernel/v2.6/24/drivers/usb/storage/usb.c
needs patched into the kernel source to make >2TB work.
A2) get the CentOS kernel SRPM and patch it in, build, install and use.
[considering the bz you point to points to (in Comment #7) a very small patch 
for the ipbvscsi 
devices, it is _probably_ just a simple patch from the 24 version of usb.c]


B1) give a kernel dev at that prominent North American Enterprise Linux vendor 
(who runs Enterprise 
Linux instead of Fedora) a 2.8TB USB disk to play with and
B2) point them at 
http://www.linuxhq.com/kernel/v2.6/24/drivers/usb/storage/usb.c

:)

Alternatively we could find someone with a 2+TB USB disk and the ability to 
submit bugs on a 
subscription to that prominent North American Enterprise Linux vendor.
(or see if a proven change could be put in a CentOS plus kernel[module])

-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane)
Harnessing the Power of Technology for the Warfighter
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Re: [CentOS] 2 TB limit on USB drive

[Eero Volotinen]

> This bug seems very similar to a previous bug: 
> https://bugzilla.redhat.com/show_bug.cgi?id=502944 which was reported 
> fixed in 5.4
>  
> Anyone seen this before, or have any ideas how I can get CentOS to see 
> the disk?

Centos is usually using "old" kernel, so if you want avoid this then 
possible you need to recompile your own kernel or patch current.

Bugs on usb-disk are too common nowadays..

--
Eero
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[CentOS] 2 TB limit on USB drive

[Gareth Tupper]

Hallo
 
I submitted this as a bug several weeks ago, but I wanted to ask around
& see if anyone else has come across this
 
I have a USB Buffalo Drivestation Quattro, with 4 1TB disks
configured in raid5 as one 2.8TB (or so) disk, attached to a Cent 5.4 64
bit server (completely yum'd up to date)

The disk is labeled as GPT, and formatted as a 2.8 TB ext3 partition
(this issue also happens with xfs).  I used a gparted boot disk to
create the partition.

When I attach the drive I see this in messages:

Nov 2 14:26:55 kernel: usb 1-5.2: new high speed USB device using
ehci_hcd and address 7
Nov 2 14:26:56 kernel: usb 1-5.2: configuration 001
  chosen from 1 choice
Nov 2 14:26:56 kernel: scsi5 : SCSI emulation for USB Mass Storage
devices
Nov 2 14:26:56 kernel: usb-storage: device found at 7
Nov 2 14:26:56 kernel: usb-storage: waiting for device to settle before
scanning
Nov 2 14:27:01 kernel: Vendor: BUFFALO Model: HD-QSSU2/R5 1 Rev: 2.02
Nov 2 14:27:01 kernel: Type: Direct-Access ANSI SCSI revision: 05
Nov 2 14:27:01 kernel: sdc : very big device. try to use READ
CAPACITY(16).
Nov 2 14:27:01 kernel: sdc : READ CAPACITY(16) failed.
Nov 2 14:27:01 kernel: sdc : status=0, message=00, host=5, driver=00
Nov 2 14:27:01 kernel: sdc : use 0x as device size
Nov 2 14:27:01 kernel: SCSI device sdc: 4294967296 512-byte hdwr sectors
(2199023 MB)
Nov 2 14:27:01 kernel: sdc: Write Protect is off

After this failure, the disk is either a) inaccessible, or b) reports
only a 2 TB partition.

The latest Ubuntu can read the disk, presenting the full 2.8 TB just
peachy.

This server is up to date:
uname -a: Linux myserver.mydomain.com 2.6.18-164.6.1.el5 #1 SMP Tue Nov
3 16:18:27 EST 2009 i686 i686 i386 GNU/Linux
cat /etc/redhat-release: CentOS release 5.4 (Final)

[r...@myserver ~]# cat /proc/partitions
major minor #blocks name
   ...
   8 32 2147483648 sdc << the disk showing incorrectly with only 2TB of
storage
 
This bug seems very similar to a previous bug:
https://bugzilla.redhat.com/show_bug.cgi?id=502944 which was reported
fixed in 5.4 
 
Anyone seen this before, or have any ideas how I can get CentOS to see
the disk?
 
 
 
Cheers,
Gareth
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