On Thu, 2010-07-22 at 04:50 -0500, Stan Hoeppner wrote: > Patrick Ben Koetter put forth on 7/22/2010 2:11 AM: > > * Stan Hoeppner <s...@hardwarefreak.com>: > >> Wietse Venema put forth on 7/21/2010 2:22 PM: > >>> Ram: > >>>> One server of ours just accepts the mails from clients and then relays > >>>> the mails to other servers. > >>>> Since there is almost no mail queued on the server , I think it is will > >>>> be good to mount /var/spool/postfix on a tmpfs partition. > >>> > >>> You will lose all mail in the queue when the system crashes. > >>> I agree with Victor that this is a really bad idea. > >> > >> +3 > >> > >> If you truly have a _need_ for a super fast Postfix queue, I suggest using > >> a > >> good quality wear leveling SSD. You'll get random I/O performance many > >> times > >> greater than a 15k rpm disk, but with data persistence, unlike when using a > >> ramdisk queue. There are many fast good quality SSDs available in various > >> capacities for between $100-200 USD, in standard 2.5" and 3.5" hard disk > >> mounting form factors. > > > > You can get about 150 msg/sec a 100k on a single Postfix instance if you use > > a set of 10k rpm discs in a RAID 0 and server hardware. > > If my math is correct, I believe Ram's relay server has a queue load of less > than 15 msg/sec on average, which is easily handled by a single SATA disk. > > 50,000/hr = 50,000/3600 = 13.88 msg/sec > > Ram, why are you considering ramdisk or SSD for your Postfix queues given that > a regular disk would seem to handle your load rather easily? Or, is this more > of a philosophical issue of not wanting to write anything to disk that isn't > permanent? >
You are right. If Postfix alone was running on this server will be able to handle (50k-70k msgs/hr) with the given I/O. But there are other custom functions running on this machine. I was just considering ramdisk , because that was the laziest way I could get rid of unnecessary "IOPS" to disk. Anyway I think I will go by what all you folk say. No ramdisk for postfix. Thanks for the inputs. Ram
