SQUID+ext3 +diskd --> problemy fs

[Vitezslav T. Se'm]

Peter Surda wrote:

> On Wed, Jun 12, 2002 at 09:35:16AM +0200, Vitezslav T. Se'm wrote:
> > V konferenci o squidu se to nekolikrat rozebiralo. Ext3 jeste miva problemy se
> > squidem. Doporucuje se pouzit reiserfs, ktery je na workload squidu zaroven
> > rychlejsi. Pokud prejdete na reiserfs, doporucuji pouzivat mount_option
> > notail,noatime,nodiratime.
> Mozes to nejak konkretne popisat? Mam /var/spool/squid 20GB ext3 na
> soft-raid5, ma to asi milion hitov denne a problemy ani divnu zataz som si
> nevsimol.

Jak jsem jiz psal doporucuji prohledat archivy squid-users na squid-cache.org a
squid-dev na squid-cache.org.

Z postu od Joe Coopera: (odbornik na slovo vzaty - pracuje ve SWELLTECHu
-http://www.swelltech.com - squid je jeho denni chlebicek - zabyva se testovanim
stability, benchmarkovanim - dlouhodobe prispiva do "squid projektu." Henrik
Nordstrom a Joe Cooper jsou ti PRAVI squid-GURUove)

***
ext3 is faster than ext2 in one of its modes (writeback, I believe) by a
small margin.  But last time I tried (admittedly in a Red Hat 2.4.9
kernel--so pretty old now) I could oops it at will within a few minutes
with a moderate Squid workload.

All crashers that I've ever found in ReiserFS for Squid workloads were
fixed nearly two years ago, and I've never had problems since.  And it
still benchmarks significantly faster than ext2/3 for Squid workloads.
***

Chapu, ze R&D kernelu je velice rychle, ale nemam duvod pouzivat ext3  uz proto, ze
squid ma s timto filesystemem nizsi propustnost a u proxy jde predevsim o to, aby
byla co nejrychlejsi. :-)


Tady jeste neco o RAID5 - opet Joe Cooper:

***
Squid produces very nearly the worst-case scenario for RAID 5.  Squid
distributes its workload evenly across disks without breaking objects
into pieces.  Squid does a better job choosing a disk than your RAID
will.  Let it.  And, you don't lose all of the cache store if one drive
dies.
***

Tudiz - mnohem lepsi reseni, je pouzit jednotlive disky a na kazdy dat jeden
cache_dir. Squid dokaze k temto diskum pristupovat najednou a tudiz je to mnohem
vhodnejsi reseni. Z hlediska rychlosti je take vhodne mit filesystem naplneny max na
80%.

S pozdravem

Vitezslav T. Se'm


> > S pozdravem
> >
> > Vitezslav T. Se'm
> Bye,
>
> Peter Surda (Shurdeek) <shurdeek na panorama.sth.ac.at>, ICQ 10236103, +436505122023

--

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