[Lustre-discuss] OST node filling up and aborting write

[Nick Jennings]

Hi Minh,

Yes, stripecount is set to one:

# cat /proc/fs/lustre/lov/*/stripecount
1
1

-Nick

Minh Diep wrote:
> Hi Nick,
> 
> Have you tried setting stripecount=-1 ?
> 
> Thanks
> -Minh
> 
> Nick Jennings wrote:
>> Hi Everyone,
>>
>>   I have a small lustre test machine setup to bring myself back up to 
>> speed as it's been a few years. This is probably a very basic issue 
>> but I'm not able to find documentation on it (maybe I'm looking for 
>> the wrong thing).
>>
>>   I've got 4 OSTs (each 2gigs in size) on one lustre file system. I dd 
>> a 4 gig file to the filesystem and after the first OST fills up, the 
>> write fails (not enough space on device):
>>
>>
>> # dd of=/mnt/testfs/datafile3 if=/dev/zero bs=1048576 count=4024
>> dd: writing `/mnt/testfs/testfile3': No space left on device
>> 1710+0 records in
>> 1709+0 records out
>> 1792020480 bytes (1.8 GB) copied, 55.1519 seconds, 32.5 MB/s
>>
>> # df -h
>> Filesystem            Size  Used Avail Use% Mounted on
>> /dev/hda1              15G  7.7G  5.9G  57% /
>> tmpfs                 252M     0  252M   0% /dev/shm
>> /dev/hda5             4.1G  198M  3.7G   6% /mnt/test/mdt
>> /dev/hda6             1.9G  1.1G  686M  62% /mnt/test/ost0
>> 192.168.0.149 at tcp:/testfs
>>                        7.4G  4.7G  2.4G  67% /mnt/testfs
>> /dev/hda7             1.9G  1.8G   68K 100% /mnt/test/ost1
>> /dev/hda8             1.9G   80M  1.7G   5% /mnt/test/ost2
>> /dev/hda9             1.9G  1.8G   68K 100% /mnt/test/ost3
>>
>>
>> I did this 2 times, which is why both ost1 and ost3 are full. As you 
>> can see, ost2 and ost0 still have space.
>>
>> I initially thought this could be solved by enabling striping, but 
>> from HowTo (which doesn't say much on the subject admittedly) I 
>> gathered striping was already enabled? (4MB chunks). So, shouldn't 
>> these OSTs be filling up at a relatively uniform ratio?
>>
>> # cat /proc/fs/lustre/lov/testfs-clilov-ca5e0000/stripe*
>> 1
>> 0
>> 4194304
>> 1
>> [root at andy ~]# cat /proc/fs/lustre/lov/testfs-mdtlov/stripe*
>> 1
>> 0
>> 4194304
>> 1
>>
>>
>> Thanks for any help,
>> -Nick
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