big count of sda-partitions

big count of sda-partitions

[Christina Braun]

Hello,
I have the bad and stressig problem to use a lot of partitions (>16) on 
our hardwareraid,3ware 9590SE-16ML,  >2 TB, debian-etch, 2.6.18-4-amd64.
I have compiled parted, use the gpt-Partitiontable (theoretical for >2TB 
and 128 Partitions) . I have tested with 14 partitions with no problems. 
I use udev, like it,  and have succesfull name the disks with it. (2 
internal, 1 hw-raid).
The kernel-config of this debian-etch has CONFIG_PARTITION_ADVANCED=y, 
CONFIG_EFI_PARTITION=y,
By creating the partitions for the final production-system with parted, 
no errors first,  with more partitions, which I can create in parted 
without errors (but not delete!),  I  can only see sda1-15Partition 
under /dev. Also reboot makes no chances. I see the parameter 
/sys/block/sda/range = 16. Changes this by echo (example:echo 21 
 >/sys/block/sda/range) are not approved. Is that the tuning-parameter? 
How can I increase the number of partitions for udev? Or is this the 
total wrong place? I have searched in the web and kernel-sources, but 
nobody seems to have the same problem or interest for using a lot of 
partitions under linux.
ThankYou very much,
with best regards,
Christina

 

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Re: big count of sda-partitions

[Kay Sievers]

On 7/24/07, Christina Braun <braun@mail.informatik.uni-essen.de> wrote:
> I have the bad and stressig problem to use a lot of partitions (>16) on
> our hardwareraid,3ware 9590SE-16ML,  >2 TB, debian-etch, 2.6.18-4-amd64.
> I have compiled parted, use the gpt-Partitiontable (theoretical for >2TB
> and 128 Partitions) . I have tested with 14 partitions with no problems.
> I use udev, like it,  and have succesfull name the disks with it. (2
> internal, 1 hw-raid).
> The kernel-config of this debian-etch has CONFIG_PARTITION_ADVANCED=y,
> CONFIG_EFI_PARTITION=y,
> By creating the partitions for the final production-system with parted,
> no errors first,  with more partitions, which I can create in parted
> without errors (but not delete!),  I  can only see sda1-15Partition
> under /dev. Also reboot makes no chances. I see the parameter
> /sys/block/sda/range = 16. Changes this by echo (example:echo 21
>  >/sys/block/sda/range) are not approved. Is that the tuning-parameter?
> How can I increase the number of partitions for udev? Or is this the
> total wrong place? I have searched in the web and kernel-sources, but
> nobody seems to have the same problem or interest for using a lot of
> partitions under linux.

SCSI sd* devices do not support more partitions. You have to use
device-mapper and kpartx (tool from the multipath package) to create
more partitions out of one block device.

Kay

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