Re: Linux on its way out - unless you are a geek ...
From: Chuck Chopp (ChuckChopp_at_rtfmcsi.com)
Date: 04/16/04
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Date: Fri, 16 Apr 2004 15:22:36 -0400
Andrew Harrison wrote:
>>>>
>>>> I do agree that clustering on every other server platform has been a
>>>> joke. I still don't see a distributed lock manager in other
>>>> clustering solutions to allow for concurrent access to file systems
>>>> from multiple clustered nodes. The most popular of the
>>>> Windows/NetWare/Linux clustering solutions provide more of a
>>>> fail-over rather than a loosely-coupled type of clustering
>>>> environment. I laugh everytime I see one of those other operating
>>>> systems being touted as having clustering capabilities.
>>>>
>>>
>>> Well you haven't looked very far.
>>>
>>> How about looking here.
>>>
>>> http://www.sun.com/storage/software/data_mgmt/performance/
>>>
>>> Incedentally this is not a new product.
>>>
>>> Who is laughing now ?
>>>
>>
>>
>> He still is laughing. Like he said, he found the others a joke.
>>
>>
> I think you need to re read his post.
>
> He said he didn't find anything that allowed concurrent access
> to filesystems from multiple clustered nodes.
>
> He has now been shown one and his laughing days are over.
>
> Unless you think he has actually tried QFS ! do you ???
>
> Regards
> Andrew Harrison
>
Sun StorEdge Performance Suite Software -
From what I see, it is a storage system add-on via an additional file
system that can be installed, not a true fully-featured clustering solution
that is an integral part of the operating system. It is aimed at SAN and
NAS storage, but does it also allow for concurrent read/write access from
multiple cluster nodes regardless of when the storage is locally attached to
a subset of the cluster nodes where each node has multiple redundant
physical paths to the storage?
I don't see it as being functionally equivalent to OpenVMS Clustering
technology. Perhaps I simply set too high a standard when it comes to my
expectations of what a "clustering solution" provides in the way of features
and functionality. I spent so many years working with OpenVMS Clustering
that now I'm spoiled. When I refer to a cluster, I'm talking about a
loosely-coupled configuration where multiple nodes all boot the same
operating system and coordinate access to all shared cluster resources via a
distributed lock manager. Furthermore, all of the coordinated access to
resources is integrated as part of the operating system such that there are
absolutely no differences in how applications are coded in order for them to
run on either a standalone node or on one or more nodes in a cluster. This
includes not needing to migrate data onto special volumes that run a special
file system. Other than having to enable MSCP serving of disks, there's
nothing else that needs to be done for a cluster member to serve out locally
attached disks to other cluster members. Likewise, cluster nodes with
multiple physical paths to the disks will coordinate their access via those
physical paths while simultaneously coordinating with other cluster nodes
that access the disks via network-based cluster interconnects.
As for lumping Sun in at the start of the thread... it was just to "get your
goat"... and it did. I hadn't seen you posting much here lately and figured
that you'd bark most ferociously if a little flame bait popped up on your
radar screens. You took it hook, line & sinker.
-- Chuck Chopp ChuckChopp (at) rtfmcsi (dot) com http://www.rtfmcsi.com RTFM Consulting Services Inc. 864 801 2795 voice & voicemail 103 Autumn Hill Road 864 801 2774 fax Greer, SC 29651 Do not send me unsolicited commercial email.
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