[Lustre-discuss] xserve raid

[Anand Bisen]

Just to add a note, that if we do use partitions on the DDN storage  
then, the partition should be created with first cylinder as 9 and  
this will make sure that the alignment is optimal.

Thanks

Anand


On Oct 18, 2007, at 10:11 AM, Brian J. Murrell wrote:

> On Thu, 2007-10-18 at 13:02 -0400, Brock Palen wrote:
>>
>> I did some basics test,  1MDS 1OST 1raid5 (half a xserve raid)  Using
>> tiobench on 1 client,  using no partition table netted about 5MB/s
>> faster for streaming read/write.  I will scale up my tests though and
>> try some other raid configurations.  Thanks for the help.
>
> You could consider using the sgpdd_survey in our iokit.  It was  
> written
> specifically to test raw disk throughput and can cover a large  
> number of
> concurrent threads and i/o sizes to show you the characteristics of  
> your
> disk.
>
> Some disks, such as DDNs specifically (maybe there are others) are
> recommended to use without partition tables because the partition  
> table
> at the beginning of the disk interferes with optimal alignment
> characteristics of the disk and performance suffers as a result.
>
> b.
>
>
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at clusterfs.com
> https://mail.clusterfs.com/mailman/listinfo/lustre-discuss