| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
UUU: Major problems on SLS performance after raising NISCS_MAX_PKTSZ
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We have raised NISCS_MAX_PKTSZ from 1498 to 4468 on all nodes in our cluster
(Recommendation in HS121 Installation Guide).
Now we experience very long backup times for our SLS backups (i.e. many hours
for one disk which was finished within 20 minutes earlier).
which means that we are not able to finish our backup!
Before raising NISCS_MAX_PKTSZ there were not any performance impacts on
the backup process.
configuration
------------- NISCS-Adapt.
| SI0001 | VAX 6000-640 | VMS V5.5-2 DEMFA V2.0
| HSJ007 | HSJ4 | HSJ V27J |
| HSJ003 | HSJ4 | HSJ V27J |
| HSJ008 | HSJ4 | HSJ V27J |
| HSJ009 | HSJ4 | HSJ V27J |
| HSC014 | HS70 | HSC V820 |
| HSC006 | HS70 | HSC V820 |
| HSC015 | HS70 | HSC V820 |
| HSC013 | HS70 | HSC V820 |
| HSC023 | HS70 | HSC V820 |
| HSC022 | HS70 | HSC V820 |
| SI0005 | VAX 7000-630 | VMS V5.5-2 DEMFA V2.0 LRPSIZE 4541
| SI0018 | VAX 6000-620 | VMS V5.5-2 DEMFA V2.0 LRPSIZE 4541
| SI7599 | ALPH HS121 1. Proc. | VMS V6.2 | DEFEA-AA V2.46
NISCS_MAX_PKTSZ 4468
| SI0285 | ALPH | VMS V6.2 | DEFEA-AA V2.46
NISCS_MAX_PKTSZ 4468
| SI7598 | ALPH HS121 2. Proc. | VMS V6.2 | DEFEA-AA V2.46
NISCS_MAX_PKTSZ 4468
| SI0437 | ALPH | VMS V6.2 | DEFEA-AA V2.46
NISCS_MAX_PKTSZ 4468
On system SI0001 SLS V2.6 is running. The selected backup drive is
SI7599::$1$MKB200: (activated by Remote Device Facility, V4.0G).
On system SI7599 SLS V2.5B is running (including RDF V4.0M).
Tape $1$MKB200: is one of four tapes of a TL810 jukebox.
Help is very urgent required due the customer is unable to finish his backup!
Regards
Hermann Schwiezer
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1986.1 | STRWRS::KOCH_P | It never hurts to ask... | Tue Mar 19 1996 06:49 | 17 | |
Well, this is probably the wrong notesfile anyway, but I'll take a
stab.
The obvious is that you don't list NISCS_MAX_PKTSZ for your OpenVMS VAX
systems. If you don't raise this, and the Ethernet and FDDI are bridged
like they're supposed to be, it means you're going thru the bridge.
Second, trying to get this problem solved will be tough. You have
connected 5.5-2 system to 6.2 system and I don't believe this is a
WARRANTED solution which means Colorado's fix to the problem before
they'll look at this problem is for the VAX systems to be upgraded to
V6.2.
Also, with 5.5-2 there were some peculiar problem with the DEMFA
driver. If you want the 5.5-2 system to possibly work, make sure you've
installed all the patches which are available.
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