[Lustre-discuss] Disappearing OSTs

Brian J. Murrell Brian.Murrell at Sun.COM
Fri May 2 09:28:50 PDT 2008


On Fri, 2008-05-02 at 12:09 -0400, jrs wrote:
> 
> A difference between this and the lustre filesystem, of course, is that
> there is not device name created for the partition, e.g.,
> 
> oss01:~ # ls -l /dev/mapper/ost_oss01_lustre0102_01_bad_no_use*
> brw------- 1 root root 253,  7 May  2 09:09 /dev/mapper/ost_oss01_lustre0102_01_bad_no_use
> brw------- 1 root root 253, 12 May  2 09:09 /dev/mapper/ost_oss01_lustre0102_01_bad_no_use-part1
> 
> while a lustre OST uses the whole disk/volume

So for your ext3 test you partitioned the disk and used a partition and
for lustre you used the whole disk?  Why not do a more apples-to-apples
comparison and format the whole device with ext3 just like you would
with Lustre?  There is no rule that you have to use partitions with
ext3.

Also be sure you are using the exact same disk/device between your two
tests to eliminate a possibility that this is related to only one
specific device.

You also mention partitions in your post.  You need to make sure that if
you are using a whole disk device (i.e. /dev/sda rather than /dev/sda1)
you cannot use any partitioning tools on that device or you will
overwrite the beginning of your filesystem.

b.

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