[Lustre-discuss] Performance parameters
Klaus Steden
klaus.steden at thomson.net
Tue Jun 10 11:56:08 PDT 2008
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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