| Title: | Ask the Storage Architecture Group |
| Notice: | Check out our web page at http://www-starch.shr.dec.com |
| Moderator: | SSAG::TERZA N |
| Created: | Wed Oct 15 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 6756 |
| Total number of notes: | 25276 |
A customer has a VAX7610 and VAX7620. They recently switched from HSJ40s to HSJ50s and their performance decreased dramatically. They insist that there were no other changes in their environment. Just so nothing obvious is being overlooked, does anyone have any suggestions as what to be looking at? Is 4K packet size an issue? Drive firmware? - jim
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 6688.1 | Look at these things... | SSDEVO::RMCLEAN | Wed May 14 1997 14:02 | 3 | |
4k packet size might improve things. Is caching turned on? This is usally the biggest culpret to a LARGE change. Did you change something else in the configuration??? | |||||
| 6688.2 | Does the CIXCD support 4k packets? | CHTRBX::HESHELMAN | Thu May 15 1997 09:56 | 17 | |
>>> 4k packet size might improve things. Please educate me on this. I thought the CIXCD did not support 4k packets but that the HSJ50 does. If this is the case, I was wondering if some parameters must be set for correct operation. I assumed the HSJ50 automatically adjusted itself to talk "down" to the CIXCD. >>> Is caching turned on? Yes, as a matter of fact the customer reports using 64MB of cache and that the larger cache (they were using 32MB in the HSJ40) has helped "a little" >>> Did you change something else in the configuration??? Customer swears they didn't. - thanks, jim | |||||
| 6688.3 | STOWKS::SLUIS | Hans van Sluis -- Storage Engineering Support Europe- DTN 889 9526 | Fri May 16 1997 07:17 | 10 | |
Can you post the output of the following CLI commands: SHOW THIS FULL SHOW UNIT FULL SHOW STORAGE FULL SHOW DEVICES FULL An HSJ50 should perform almost the same as an HSJ40, certainly with CIXCD's as host adapters. Hans | |||||