Preallocation with direct IO?
Hi, I am using a test setup which is doing write using multiple threads using direct IO. The buffer size which is used to write is 512KB. After continously running this for long duration - i observe that number of extents in each file is getting huge(2K..4K..). I observed that each extent is of 512KB(aligned to write buffer size). I wish to have low number of extents(i.e, reduce fragmentation)... In case of buffered IO- preallocation works good alongwith the mount option 'allocsize'. Is there anything which can be done for Direct IO? Please advice for reducing fragmentation with direct IO. Thanks & Regards, Amit Sahrawat Sent from my Nokia phone _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs