Universe tends to make it's IO requests in 4K blocks, so you may want to make 
sure you're not sharing spindles with things like sharepoint, where a typical 
disk read request is more like 500K. You could end up with a 4K read waiting on 
something 100 times larger as a regular thing. In AIX, it's a great idea to 
increase RAM so that your cache hit rate is very high. With the lrud approach, 
you can get very high %'s.
 
> From: r...@lynden.com
> To: u2-users@listserver.u2ug.org
> Date: Tue, 2 Jul 2013 13:12:06 -0700
> Subject: Re: [U2] SAN?
> 
> Ty,
> 
> We have run 2 good sized Solaris boxes and 1 medium one over paired 1Gb 
> switches for a long time ~ 5-600 users, thousands of files. Bandwidth is not 
> a problem.  We do run a separate network for SAN access from the servers.  As 
> a practical matter, this works.  We are upgrading the switches to 10Gb, but 
> we are by no means saturated.
> 
> Solaris supports an "llock" or local lock option on NFS mounts which 
> circumvents some of the performance issues mentioned in Aaron's message. I 
> think that there is a similar solution for Linux boxes. 
> 
> rw,bg,vers=3,proto=tcp,hard,intr,rsize=32768,wsize=32768,llock
> 
> This may not apply with your SAN.  But if you can move some stuff over and 
> test it, it is definitely worth the effort.  Is NFS slower that a local disk? 
>  Likely so, right up until you have a disk failure, have to restore from tape 
> instead of a snapshot, or fsck 500 Gigs.  Is performance very good anyway? 
> Yes. If a SAN can handle the average Microsoft product & output, U2's text 
> based data cannot be all that difficult. ("hello world" in msword is worth 5 
> groups in UV.) I apologize for the evangelical bent.
> 
> There are doubtlessly architectural solutions other than NFS mounts, and some 
> may be appropriate to your hardware and applications.  NFS can be quite 
> simple and surprisingly robust.
> 
> -Rick
> 
> -----Original Message-----
> From: u2-users-boun...@listserver.u2ug.org 
> [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Ty Haller
> Sent: Tuesday, July 02, 2013 10:50 AM
> To: 'U2 Users List'
> Subject: Re: [U2] SAN?
> 
> Thanks.
> 
> I'm aware of the advantages. I was more concerned with the IO requirements 
> and how that would impact shared storage.
> 
> 
> 
> Ty Haller
> SEFCU
> Lead Administrator - System Services
> thal...@sefcu.com
> 
> > -----Original Message-----
> > From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-
> > boun...@listserver.u2ug.org] On Behalf Of Rick Nuckolls
> > Sent: Tuesday, July 02, 2013 11:13 AM
> > To: 'u2-users@listserver.u2ug.org'
> > Subject: Re: [U2] SAN?
> > 
> > Ty,
> > 
> > We have used a NetApps SAN for a number of years with Solaris for Universe
> > data.  (For Universe) there is the obvious tweak of allowing direct access 
> > to
> > NFS, and depending on the type of SAN, there are probably some mount options
> > to optimize the throughput.  It also helps to have a fair amount of memory 
> > for
> > file caching, but it works great and provides many important advantages.  A
> > couple of caveats: Do not allow access to snapshots through the same NFS
> > mount as the primary data.  For NetApps, at least, the snapshot has the same
> > inode as the live data file, so the snapshot tree must be mounted as a 
> > separate
> > device to avoid confusing (Universe) with conflicting file headers and 
> > data.  NFS
> > mounts work fine, as long as access to a particular directory tree is 
> > managed
> > by a single data server.
> > 
> > Oracle supports this same configuration, though I do not think that Rocket 
> > has
> > much experience with it.
> > 
> > Although difficult, it is possible to install Universe a SAN, and then run 
> > it on a
> > VM, which means that you can snapshot almost all of the UV environment at
> > once!
> > 
> > Rick Nuckolls
> > Lynden Inc
> > 
> > 
> > 
> > -----Original Message-----
> > From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-
> > boun...@listserver.u2ug.org] On Behalf Of Ty Haller
> > Sent: Tuesday, July 02, 2013 6:15 AM
> > To: 'u2-users@listserver.u2ug.org'
> > Subject: [U2] SAN?
> > 
> > Morning,
> > 
> > I am curious if anybody has UniData Accounts running off a Shared Enterprise
> > SAN?
> > 
> > We currently have an Enterprise SAN for our VMware Environment and would
> > like to put a handful of UniData Test Accounts on it.
> > 
> > We are using UniData 7.2 on an IBM P6 running AIX 6.1, the SAN would be 4GB
> > Fiber Attached.
> > 
> > 
> > Thoughts?
> > 
> > Ty Haller | Lead Administrator - System Services | SEFCU | thal...@sefcu.com
> > 700 Patroon Creek Blvd. Albany, NY 12206 | Phone: 518-464-5210 | Fax: 518-
> > 464-5209
> > 
> > This message may contain confidential information and is intended for the 
> > sole
> > purpose of communication with the addressee. Dissemination or publication in
> > any format is strictly prohibited. If you have received this communication 
> > in
> > error please notify SEFCU immediately.
> > 
> > Help save a tree. Please print this e-mail only if it is truly necessary. 
> > Thank you.
> > _______________________________________________
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> This message may contain confidential information and is intended for the 
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> 
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