I tried to install 11.2 on an 8 GB SSD via boot from DVD into a 7761020K ext4 rootfs.

I selected *every* pattern/scheme and got a yast warning that I'm running into low disk space (but 421909K == 5% shall remain free!).  from y2log:

2009-11-18 21:27:32 <1> linux(6532) [Pkg] Target_DU.cc(TargetInitDU):282 Adding /
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:431 INIT done, SpaceCalculation - partitions: [$["free":99302, "name":"boot", "used":0], $["free":7879680, "name":"/", "used":0]]
2009-11-18 21:27:32 <1> linux(6532) [Pkg] SpaceCalculation.ycp:570 Pkg Builtin called: TargetGetDU
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:572 /: [7879680, 0, 7457771, 0]
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:572 boot: [99302, 0, 53502, 0]
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:585 Total used space (kB): 7511273, fits ?: true
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:602 min. free space: 25%, max. unsufficient free space: 768000
2009-11-18 21:27:32 <1> linux(6532) [Pkg] SpaceCalculation.ycp:609 Pkg Builtin called: TargetGetDU
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:611 Disk usage of directory /: [7879680, 0, 7457771, 0]
2009-11-18 21:27:32 <2> linux(6532) [YCP] SpaceCalculation.ycp:624 Partition /: less than 25% free space (5%, 421909)
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:611 Disk usage of directory boot: [99302, 0, 53502, 0]
2009-11-18 21:27:32 <1> linux(6532) [YCP] SpaceCalculation.ycp:633 Result: [$["dir":"/", "free_percent":5, "free_size":421909]]
2009-11-18 21:27:32 <1> linux(6532) [Pkg] Packages.ycp:142 Pkg Builtin called: ResolvableProperties


so I started installation... and did run out of disk space duing installation (with several 100s of RPMs still to be installed).

1st I've removed /usr/src/linux-2.6.27.37-0.1/ (~410 MB) and continued with installation -- and run out of disk space again.

so I removed /usr/share/texmf/ (~1.6 GB!) on VC2 and continied and finally finished installaion.

now root looks like this:

# df /
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/ssd--system-root
                       7761020   7192832    173948  98% /


so I did remove ~2000 MB and the final free space is ~250 MB too low (420M-170M), thus the disk space calculation seems to be off by ~2250 MB !!!