Multiple virtual segments

I'm looking at a customer site where they have many virtual memory segments. IDS 9.20 UC3 on Solaris 2.6.(yes, I know it's very elderly) Informix Dynamic Server 2000 Version 9.20.UC3 -- On-Line -- Up 5 days 06:09:01 -- 360448 Kbytes Segment Summary: id key addr size ovhd class blkused blkfree 801 1381386241 a000000 100663296 5456 R* 23483 1093 802 1381386242 10000000 50331648 2128 V 12288 0 503 1381386243 13000000 3145728 688 M 647 121 504 1381386244 13300000 16777216 1104 V 4096 0 505 1381386245 14300000 16777216 1104 V 4019 77 506 1381386246 15300000 16777216 1104 V 3948 148 507 1381386247 16300000 16777216 1104 V 4077 19 408 1381386248 17300000 16777216 1104 V 3854 242 409 1381386249 18300000 16777216 1104 V 3876 220 410 1381386250 19300000 16777216 1104 V 3797 299 411 1381386251 1a300000 16777216 1104 V 3268 828 412 1381386252 1b300000 16777216 1104 V 3774 322 413 1381386253 1c300000 16777216 1104 V 3703 393 414 1381386254 1d300000 16777216 1104 V 3675 421 415 1381386255 1e300000 16777216 1104 V 3794 302 416 1381386256 1f300000 16777216 1104 V 1553 2543 Total: - - 372244480 - - 83852 7028 Are there any known problems on elderly versions of Solaris with multiple segments, as used to be the case with HP-UX 10.20? Are there general problems with such an arrangement anyway? thanks Neil