NFS size and number limit

[Maurizio Fulli]

Hi,
I've 7 TB (on Emc symmetrix) to share on a network.
I want to know,how many size i can share with Nfs (version 3) on an Hp-UX 11i?
and how many file system i can share?

Best regards
Maurizio

[Kent Ostby]

Maurzio --

Still looking into the limits you asked for although I dont think there is a limit on the overall size.

Be sure to take a look at this guide for performance related issues on NFS:

http://h21007.www2.hp.com/dspp/files/unprotected/devresource/Docs/Presentations/NFSperf.pdf

Best regards,

Kent Ostby

[Todd Whitcher]

Hi Maurizio,

Please see the NFS White Paper located here:

NFS Performance Tuning for HPUX 11.0 and 11i Systems by Dave Olker.

http://www.docs.hp.com/hpux/onlinedocs/1435/NFSPerformanceTuninginHP-UX11.0and11iSystems.pdf

Starting at slide 91 you will find data on FILE and FILE SYSTEM limitations.

Summary:



I suggest you review this entire document, its a great resource for NFS on HPUX.

There is a book that covers the material in the white paper along w/ much more information you may also want to review.

Optimizing NFS Performance
tuning and troubleshooting nfs on hp-ux systems
By Dave Olker

http://www.hp.com/hpbooks/prentice/ptr_0130428167.html

From Pg. 218 of Optimizing NFS perfromance.
HPUX NFS CLIENTS:
An HPUX 11.0 NFS client only supports accessing files as large as 1 terabyte. This 1TB limit applies even when the 11.0 client has mounted a NFS filesystem from a server that supports files larger than 1TB. The largest supported filesystem an 11.0 NFS client may access is 2TB. An HPUX 11i client supports accessing NFS mounted files as large as 2TB. Again this limit applies even when mounting from a NFS server that supports files larger than 2TB.

Hope this helps,

Todd Whitcher

[Massimo Bianchi]

Aside from above grest suggestion and liks, i suggest you to increase the kernel parametes accordingly and to have a proper lan setup.

For sharing a 7Tb frame, i would go at least to a 1Gb card, if not thinking of using APA. There will be a lot of traffic on that lan.

Massimo

[Maurizio Fulli]

Massimo,

what kind of kernel parameters i must increase?
Anyway i share 7 Tb on a 1000 Mb lan.

Thanks
Maurizio

[Todd Whitcher]

Hi Marizio,

The White Paper I referenced gives some suggested defaults for the kernel tunables on an NFS client / Server. Check out slide 114 for a review.

Todd

[Massimo Bianchi]

On NFS clients
- install DEVID enhancement
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/displayProductInfo.pl?productNumber=DEVICEID


- mount with -o wsize=32768,rsize=32768
- in /etc/rc.config.d/nfsconf set NUM_NFSIOD to at least 16
- kernel: dbc_max_pct 20 but only if there are no oracle instances, otherwise stick to 8/10; bufcache_hash_lock 2048; max_thread_proc 512; ninode 4096; vx_ninode 3680;


On NFS server
- install DEVID enhancement
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/displayProductInfo.pl?productNumber=DEVICEID

- in /etc/rc.config.d/nfsconf set NUM_NFSD to 64
- kernel: dbc_max_pct 50, but only if there are no oracle instances; bufcache_hash_lock 2048; max_thread_proc 512ninode 4096; vx_ninode 3680;


For a full list, refer to the link already posted, i desumed my settings for my server from there.

Massimo

[Steven E. Protter]

You are going to need general performance tuning as well:

http://www1.itrc.hp.com/service/cki/search.do?category=c0&mode=id&searchString=UPERFKBAN00000726&search.x=28&search.y=8&searchCrit=allwords&docType=Security&docType=Patch&docType=EngineerNotes&docType=BugReports&docType=Hardware&docType=ReferenceMaterials&docType=ThirdParty
If in Europe and unreadable, search for doc
UPERFKBAN00000726

Have your considered CIFS/9000 for the sharing.

It has a more robust architecture in my opinion.

Client(free)
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/displayProductInfo.pl?productNumber=B8724AA

Server(free)
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/displayProductInfo.pl?productNumber=B8725AA

Docs:
http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B8725-90003/B8725-90003_top.html&con=/hpux/onlinedocs/B8725-90003/00/00/8-con.html&toc=/hpux/onlinedocs/B8725-90003/00/00/8-toc.html&searchterms=Configuration%7cAdministration%7cCIFS/9000&queryid=20030904-092825

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B8725-90021/B8725-90021_top.html&con=/hpux/onlinedocs/B8725-90021/00/00/13-con.html&toc=/hpux/onlinedocs/B8725-90021/00/00/13-toc.html&searchterms=Configuration%7cAdministration%7cCIFS/9000&queryid=20030904-092825

regards and good luck,

SEP