After several discussions with Astaro Tech Support I've managed to stabilise our ASG320 cluster. Symptoms were lots of swapping + HTTP Proxy stopping from time to time. Here's what I did:
0. Turn of HTTP Proxy caching. Relives pressure on the disk. The low end ASG's only have slow 4800 or 5200RPM drives. Tip: open you ASG up ... pull out the slow drive and replace it with a nice Hitachi 7200RPM drive [[:)]] Probably voids your warranty by hey fast disk!!
To turn off proxy caching:
Web Security -> HTTP -> Advanced -> Uncheck Enable Caching
Click Apply
Click clear cache
1. Turn Off Dual Scan A/V. Not really needed and can cause the HTTP proxy to grind to halt when large objects pass through the cache (see next point). This means content only gets scanned once. To do this:
Web Security -> Anti-Virus:
Check Single Scan
2. SSH into your ASG and modify the cache settings as follows (the default settings applied by v7.004 are brain damaged)
vi /var/storage/chroot-squid/etc/squid.conf-default
Look for:
# OPTIONS FOR TUNING THE CACHE
# -----------------------------------------------------------------------------
maximum_object_size_in_memory [] KB
maximum_object_size [] MB
Change these to a 5 MB max memory object and only a 20 MB object size (the defaults can be ludicrous with upto 64MB objects in RAM and 620MB objects on disk):
maximum_object_size_in_memory 5120 KB
maximum_object_size 20 MB
Then restart the HTTP cache via WebAdmin.
Your milage may vary but it appears to be working for us [[:)]]
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