RE: [squid-users] Aufs Problem???Syncing pending I/O operations.. (blocking)

On this box only serious things running are squid and frox (rarely used).
I use one 8Gb cache dir and i have about 450 users accessing this server.
From cachemgr i see that average requests per minute are about 420
Should i split this cache dir to 2 or more will it make any difference.
At the old machine we were using a simple PIII with IDE disk not SCSI
mirroring we use now same number of users accessed it with a smaller Cache
Dir 4GB (ufs).
I will test ufs even if I believe aufs has better performance.
Running top shows squid using 99.9% of one CPU.

-----Original Message-----
From: Henrik Nordstrom [mailto:hno@squid-cache.org]
Sent: Monday, September 01, 2003 4:59 PM
To: TSIOLAS KOSTAS
Cc: Squid Users (E-mail)
Subject: Re: [squid-users] Aufs Problem???Syncing pending I/O operations..
(blocking)

mån 2003-09-01 klockan 12.16 skrev TSIOLAS KOSTAS:

> 2003/09/01 11:21:49| squidaio_queue_request: WARNING - Disk I/O
overloading
> 2003/09/01 11:21:49| squidaio_queue_request: Queue Length: current=4096,
> high=4096, low=161, duration=5368
> 2003/09/01 11:21:52| ctx: exit level 0
> 2003/09/01 11:21:52| ctx: enter level 0:
> 'http://www.vodafone-shop.gr/eshop/el/images/downarrow.gif'
> 2003/09/01 11:21:52| squidaio_queue_request: Async request queue growing
> uncontrollably!
> 2003/09/01 11:21:52| squidaio_queue_request: Syncing pending I/O
> operations.. (blocking)
>
> The only way to make him response againfor a while is to reboot the
machine.

If it does not help to restart Squid then you have a OS problem of some
kind. Maybe some other application going wild and seriously overloading
the harddrives.

Maybe you have slocate installed and this tries to reindex your drives,
making the system overloaded?

Or you simply have too few harddrives for the request load you are
trying to push.

Regards
Henrik

-- 
Donations welcome if you consider my Free Squid support helpful.
https://www.paypal.com/xclick/business=hno%40squid-cache.org
Please consult the Squid FAQ and other available documentation before
asking Squid questions, and use the squid-users mailing-list when no
answer can be found. Private support questions is only answered
for a fee or as part of a commercial Squid support contract.
If you need commercial Squid support or cost effective Squid and
firewall appliances please refer to MARA Systems AB, Sweden
http://www.marasystems.com/, info@marasystems.com