[Ocfs2-users] Lots of questions & lustre
Sunil Mushran
Sunil.Mushran at oracle.com
Mon Aug 8 12:10:09 CDT 2005
Jeffrey W. Baker wrote:
>Can you mmap a file on OCFS2 for reading?
>
>
Yes
>Can you execute programs off OCFS2?
>
>
Yes
>Can two hosts open the same file O_APPEND, with correct results?
>
>
Not tried it personally. But it should work. File a bug if it does not. :)
>Can the OCFS2 volume be on top of an LVM device? MD? How would that
>work?
>
>
The LVM would have to be cluster aware. While we have not tested this as
yet,
there is no reason why this should not work.
>Can you have 32-bit and 64-bit nodes in the same cluster? Nodes with
>different page sizes (e.g. Itanium)?
>
>
>
Yes. We support x86, x86-64 and IA64. All can access the same fs
concurrently.
>Is there a limit on the size of the volume on 64-bit hosts? On 32-bit?
>
>
The limit is 4 billion clusters. So if the cluster size is 1MB, it's 4
Peta bytes.
>How many inodes will I get from e.g. a 4TB volume?
>
>
The inodes are allocated from a dynamically growing space. That is, we
do not
pre-allocate inode space. Each inode is atleast a block.
>Is there a subdirectory limit?
>
>
Unless vfs has some limits. no. Not that I am aware of.
>Where can I find some comparative benchmarks? How close to wire speed
>can OCFS2 achieve on a single host? Cluster-wide? How many
>stats/second can it do? How much net traffic is caused by a given
>amount of fibrechannel traffic?
>
>
We don't have any official benchmarks as yet.
>Can you safely deliver mail on OCFS2?
>
>
>
Care to expand.
More information about the Ocfs2-users
mailing list