Re: How disk I/O affect postfix performance ?

2009-02-13 Thread Wietse Venema
Yu (Irvin) Fan: > Hi Wietse, > > Thanks for the quick answer. Can I say that the postfix performance is > affected by small file read/write speed of the disk? Many email messages small. Therefore performance is dominated by rotational and seek latencies (absent a large persistent buffer between t

Re: How disk I/O affect postfix performance ?

2009-02-13 Thread Yu (Irvin) Fan
Hi Wietse, Thanks for the quick answer. Can I say that the postfix performance is affected by small file read/write speed of the disk? Anyway, I have another related question. We have an after-queue content filter written in Perl. The email is fed to the filter using pipe as suggested in the foll

Re: How disk I/O affect postfix performance ?

2009-02-13 Thread Wietse Venema
Wietse Venema: > Yu (Irvin) Fan: > > Hi, > > > > We're building a box to run two postfix instances to receive and send high > > volume of emails. According to the documentation it's better to run the two > > instances on separate disks for performance reason. I'm trying to understand > > how exact

Re: How disk I/O affect postfix performance ?

2009-02-13 Thread Wietse Venema
Yu (Irvin) Fan: > Hi, > > We're building a box to run two postfix instances to receive and send high > volume of emails. According to the documentation it's better to run the two > instances on separate disks for performance reason. I'm trying to understand > how exactly does the disk I/O affect t

How disk I/O affect postfix performance ?

2009-02-12 Thread Yu (Irvin) Fan
Hi, We're building a box to run two postfix instances to receive and send high volume of emails. According to the documentation it's better to run the two instances on separate disks for performance reason. I'm trying to understand how exactly does the disk I/O affect the postfix performance? By s