Re: [squid-users] Workaround for failing hardware

Kurt Buff wrote:
> All,
>
> I'm running squid 2.6.17 on a FreeBSD 6.2-STABLE. This should be
> mostly irrelevant, as I am trying to ameliorate a hardware issue while
> I get a new machine up and running. The issue is that we have
> extremely slow initial load of pages, which I suspect is because of
> slow and perhaps faulty disk access - haven't localized it to disk or
> controller yet. We have moved from a T1 to a DS3, and ever since
> people have been complaining of slow web access, which seems a bit
> counterintuitive.
>
> The hardware is:
> 2.4GHz Celeron CPU
> 2G RAM
> Single HD: ad6: 76319MB <WDC WD800JD-00MSA1 10.01E01> at
> ata3-master SATA150
>
> I'm getting a fair number of this message:
>
> ad6: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=112214751
>
>
> and am noticing that squid is dumping core every once in a while,
> though it does restart:
> pid 3509 (squid), uid 100: exited on signal 6 (core dumped)
>
>
> I've tried to solve this temporarily by preventing squid from caching
> at all - by adding "no_cache deny all" and "pipeline_prefetch on" to
> the config.
>
> What I want to make sure of is that other settings don't negate this
> effort. What should I strip (or add) to my configuration below?
>
> Current configuration file:
>
> http_port 3128
> hierarchy_stoplist cgi-bin ?
> acl QUERY urlpath_regex cgi-bin \?
> cache deny QUERY
> acl apache rep_header Server ^Apache
> broken_vary_encoding allow apache
> cache_mem 512 MB
> cache_dir ufs /usr/local/squid/cache 2000 16 256
>

Change this to...

cache_dir null /dev/null

...if you can. The null storedir type might not have been built in.

> logformat combined %>a %<A %ui %un [%tl] "%rm %ru HTTP/%rv" %Hs %<st
> "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh
> access_log /usr/local/squid/logs/access.log combined
> access_log syslog combined
>

The log files are still hitting the disk. If you really want to limit
your disk activity, use only syslog, and pipe the logs to another server
(or turn logging off entirely).

> refresh_pattern ^ftp: 1440 20% 10080
> refresh_pattern ^gopher: 1440 0% 1440
> refresh_pattern . 0 20% 4320
> acl all src 0.0.0.0/0.0.0.0
> no_cache deny all
> acl manager proto cache_object
> acl localhost src 127.0.0.1/255.255.255.255
> acl to_localhost dst 127.0.0.0/8
> acl SSL_ports port 443
> acl CONNECT method CONNECT
> http_access allow manager localhost
> http_access deny manager
> http_access deny !Safe_ports
> http_access deny CONNECT !SSL_ports
> acl our_networks src 10.0.0.0/8 192.168.8.0/24 192.168.10.0/24
> 192.168.11.0/24 192.168.12.0/24 192.168.13.0/24 192.168.15.0
> /24 192.168.24.0/24
> http_access allow our_networks
> http_access deny all
> http_reply_access allow all
> icp_access allow all
> visible_hostname zsquid.mycompany.com
> coredump_dir /usr/local/squid/cache
> pipeline_prefetch on
>
>
> Kurt
>

Chris
Received on Wed Jun 25 2008 - 20:44:06 MDT