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Re: Very slow network writes to my Xsan

Title: Re: Very slow network writes to my Xsan
Are you running an Xserve Machine as a client to the SAN and having the client share out the files?? Or are you sharing out the files from one of your meta data controllers??

--
Shane A. Miller
Data Archivist
email@hidden



On 2/22/06 11:44 AM, "George Harvestmeister" <email@hidden> wrote:

> I am having a performance problem with network writes to my XSan.  I have
> done a lot of testing and here is what it boils down to.  Reads and writes
> between my XServe G5 and the XServe RAID over fiber channel perform as
> expected.  If I share a folder on an internal hard drive in the XServe G5,
> all my network clients can read and write fast over SMB and FTP.  If I share
> a folder on a client and connect to it from the XServe G5, it can read and
> write fast to that share.  When I share a folder on the XSan from the XServe
> G5 however, reads function normally, but clients that attempt to write to
> the share are bottlenecked at roughly 4MB/s per client.  Multiple clients
> each add 4MB/s write, so two clients I see a total of 8MB/s network traffic,
> 5 clients I see 20MB/s etc.
>
> So I know from this testing that my ethernet topology is fine since all
> clients and servers can talk to each other at expected performance for
> Gigabit ethernet, and that my fiber channel topology is fine because if I
> copy files from the local hard drive in the XServe G5 onto the XSan, writes
> run as fast as the internal drive can serve them up.  That leaves something
> occurring at the point where the server takes inbound ethernet network
> traffic and sends it to the XSan for writing to the disk.
>
> I have an extremely simple configuration for users and permissions.  There
> is only one folder on the XSan volume, and there are only two user accounts
> that have access.  One has read only access, the other is read and write
> access.
>
> The only anomaly I can find is if I watch the FC traffic graph during these
> writes.  whether it is one client poking along at 4MB/s or 5, the FC always
> shows 120MB/s traffic, which coincidentally is the same as the peak
> sustained write rate to my SAN using the XSan tuner tool.
>
> Has anyone run into anything like this before?  I am really stumped.
>
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 >Very slow network writes to my XSan (From: "George Harvestmeister" <email@hidden>)



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