From: Shane Miller2 <email@hidden>
To: George Harvestmeister
<email@hidden>,<email@hidden>
Subject: Re: Very slow network writes to my Xsan
Date: Wed, 22 Feb 2006 11:57:38 -0700
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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