General discussion

Locked

ISA Cache Server slow on 1st Try

By bradleyr ·
We have ISA running on a 512Mb of RAM 2000 Server.
It is a cache server. It is pointed to a webserver from which it caches the pages (duh). For some reason the first time the info is cached, it is quite slow for the user who is downloading the info (there is quite a bit of stuff being downloaded - 5 to 10 Mb). On the second go around, it quite fast. Example:
When I choose to pull the info from the webserver itself (no caching) - it is fast!!!. Then, I try to access the same info from the cache ISA server - it slows down by about half. Then, I try to access the info from the cache ISA server again - and now it is just as fast as from the webserver itself. I have tracert'd and know for a fact that both are on the same subnet and talk to each other on the same subnet. So, i do not think that the routing has anything to do with this. Has anyone seen something like this? I understand the first time the info is not present on the cache server, but should it not just pass it along and then write it locally from memory? Just can't figure out why it is so slow the first time around. Please help. Thanks in advance.

This conversation is currently closed to new comments.

3 total posts (Page 1 of 1)  
| Thread display: Collapse - | Expand +

All Comments

Collapse -

ISA Cache Server slow on 1st Try

by ptchtech In reply to ISA Cache Server slow on ...

There are a things you can do to increase performance. For starters throw more RAM into your server (at least double it to a Gig - two if you can). By default ISA server will only cache objects up to 12800 bytes in RAM. Everything else will be cached only to disk, So the first thing you want to do is load up on RAM. Next right click cache configuration and go to the advanced tab. Increase the maximum size of URL cached in memory. Also since you added more RAM you should increase the percentageof RAM that can be used for caching. Your cache lag may now be solved since the performance hit you had was most likely the result of disk caching.
You can also configure Prefetching to have ISA server prefetch commonly accessed pages using the "scheduled content download job wizard" prefetching should help keep fresh objects in cache, further reducing the chance that the first person accessing an object that changed will experience the cache lag.
Good luck

Collapse -

ISA Cache Server slow on 1st Try

by bradleyr In reply to ISA Cache Server slow on ...

Poster rated this answer

Collapse -

ISA Cache Server slow on 1st Try

by bradleyr In reply to ISA Cache Server slow on ...

This question was closed by the author

Back to Windows Forum
3 total posts (Page 1 of 1)  

Related Discussions

Related Forums