RE: BUFFERS

I've heard the same is true for LRUs = 64 or 96..... I've been told to avoid those numbers..... as well as 128. -----Original Message----- From: Art S. Kagel [mailto:kagel@bloomberg.net] Sent: Wednesday, August 18, 1999 2:43 PM To: informix-list@iiug.org Subject: Re: BUFFERS The maximum value of LRUS is 128 as for CLEANERS also. There is a bug in all versions upto and including 7.24UC7 that reports a spurious error message at startup time if you use 128 LRUs, complaining that your logical and physical logs sizes are zero (0) so I just use 127. I have not check to see if they fixed this one in 7.3x but it is harmless, only annoying. Art S. Kagel Phillip Tien wrote: > > The sysadmin book says that the max number of BUFFERS for IDS is > 512000. However, I just discovered that our number was set higher than > that, and everything's working fine. In fact, we have read/write cache > ratio's of around 95% (onstat -p). I was just wondering if anyone knew > the detriments of having their # of BUFFERS higher than 512K. Also, > anyone know the max # LRUs IDS can have? Thanks. > > -- > Phillip > > "I always wanted to be the last guy on Earth, just to see if all those > women were lying to me."

Hi Valerie. Different problem. The problem for 128, apparently fixed at least in 7.31, was harmless. The problem with LRUS=64, and possible also 96, is quite harmful causing the bufwaits reported in onstat -p to increase by 5 to 10 times what it would be for 63 or 65. This one is a real but unacknowledged bug and as such the only way to tell if it was fixed would be to try it out in production. Understandable I have not done so since performance in the presence of the bug is dismal. Art S. Kagel Webber Valerie H wrote: > > I've heard the same is true for LRUs = 64 or 96..... I've been told to avoid > those numbers..... as well as 128. > > -----Original Message----- > From: Art S. Kagel [mailto:kagel@bloomberg.net] > Sent: Wednesday, August 18, 1999 2:43 PM > To: informix-list@iiug.org > Subject: Re: BUFFERS > > The maximum value of LRUS is 128 as for CLEANERS also. There is a bug in > all versions upto and including 7.24UC7 that reports a spurious error > message at startup time if you use 128 LRUs, complaining that your logical > and > physical logs sizes are zero (0) so I just use 127. I have not check > to see if they fixed this one in 7.3x but it is harmless, only annoying. > > Art S. Kagel > > Phillip Tien wrote: > > > > The sysadmin book says that the max number of BUFFERS for IDS is > > 512000. However, I just discovered that our number was set higher than > > that, and everything's working fine. In fact, we have read/write cache > > ratio's of around 95% (onstat -p). I was just wondering if anyone knew > > the detriments of having their # of BUFFERS higher than 512K. Also, > > anyone know the max # LRUs IDS can have? Thanks. > > > > -- > > Phillip > > > > "I always wanted to be the last guy on Earth, just to see if all those > > women were lying to me."