Ron: You are correct that the library will typically use less space, however ... This is very much dependent on the size of the CSECTS within it. I don't have a problem with the assertion that 32760 results in larger TXT blocks being written, but unless you have a library that has such large blocks, it is not a foregone conclusion that you'll save anything.
In doing a couple of experiments, SYS1.LINKLIB resulted in the following: Blocked from 6144 to 32760 - 13% savings Blocked from 6144 to 23476 - 11% savings Blocked from 6144 to 13030 - 9% savings Interestingly enough when COPYMOD was used to reblock it to 6144 from 6144 there was a net savings of 2%. (In all cases, the library was copied fresh, so there was no need for compression to remove "dead" space.) We can surmise from these savings that we are primarily dependent on the average size of the TXT records in the load module. The largest incremental savings occurred when blocking doubled to 13030, so the primary benefit occurred for CSECTS that were between 8 - 12K in size. When we increased the blocksize again, we picked up those few CSECTS that were larger, and so on. SYS1.LPALIB gained a savings of 33% from the reblocking (6144 to 32760). CAILIB only gained about 8% savings. But, as I stated earlier, these libraries probably contain the largest load modules and consequently might benefit to varying degrees by re-blocking. However, based on the observed 2% savings using COPYMOD, I do wonder how much of the "savings" would have been lost through normal use of the Binder. Let me re-iterate. I don't dispute the fact that the larger blocksizes will result in larger TXT records being written which can result in space savings. I guess what I'm trying to say is that I don't find it that exciting to save 2% or 4% in a dataset. I'm also suggesting that despite the 32760 blocksize recommendations, perhaps it simply isn't worth the effort in most cases to worry about changing how libraries are distributed. (I know I certainly wouldn't lead a crusade to reblock all my installation load libraries). Anyway ... Thanks for your comments. Adam ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html