[Lustre-discuss] Performance parameters

Klaus Steden
Tue, 10 Jun 2008 18:56:08 -0000

Hi Brian,

I know I can''t have more than one MDT online for the same file system
at the
same time, but I know it''s possible to have one configured as a hot
standby.
Are there any limits on the number of backup MDTs a given cluster can have?
I''m not sure if this question has been asked before, but I''m
curious.

cheers,
Klaus

On 6/10/08 10:10 AM, "Brian J. Murrell" <Brian.Murrell at
Sun.COM>did etch on
stone tablets:

> On Mon, 2008-06-09 at 17:59 +0200, Enrico Morelli wrote:
>>
>> Ok, I''m sorry but our real problem is that the system is very
slow
>> when the user perform ''ls'' or shell commands that
require access to
>> metadata infos. We have about 30 person that access simultaneously to
>> the system.
>
> What storage system(s) do you have behind your MDS(es) and OSS(es) and
> how are they connected?  What kind of interconnect do you have between
> your clients and your MDS(es) and OSS(es)?
>
>> What we can do to speed-up the system to solve this problem?
>
> You could try increasing the lru cache
> (/proc/fs/lustre/ldlm/namespaces/<osc>/lru_size) on your clients.
>
>> Adding another MDT can help?
>
> You cannot have more than 1 MDT at this time.
>
> b.
>
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