Hi folks, I am member of Solaris Install team and I am currently working on making Slim installer compliant with ZFS boot design specification:
http://opensolaris.org/os/community/arc/caselog/2006/370/commitment-materials/spec-txt/ After ZFS boot project was integrated into Nevada and support for installation on ZFS root delivered into legacy installer, some differences occurred between how Slim installer implements ZFS root and how it is done in legacy installer. One part is that we need to change in Slim installer is to create swap & dump on ZFS volume instead of utilizing UFS slice for this as defined in design spec and implemented in SXCE installer. When reading through the specification and looking at SXCE installer source code, I have realized some points are not quite clear to me. Could I please ask you to help me clarify them in order to follow the right way as far as implementation of that features is concerned ? Thank you very much, Jan [i] Formula for calculating dump & swap size -------------------------------------------- I have gone through the specification and found that following formula should be used for calculating default size of swap & dump during installation: o size of dump: 1/4 of physical memory o size of swap: max of (512MiB, 1% of rpool size) However, looking at the source code, SXCE installer calculates default sizes using slightly different algorithm: size_of_swap = size_of_dump = MAX(512 MiB, MIN(physical_memory/2, 32 GiB)) Are there any preferences which one should be used or is there any other possibility we might take into account ? [ii] Procedure of creating dump & swap -------------------------------------- Looking at the SXCE source code, I have discovered that following commands should be used for creating swap & dump: o swap # /usr/sbin/zfs create -b PAGESIZE -V <size_in_mb>m rpool/swap # /usr/sbin/swap -a /dev/zvol/dsk/rpool/swap o dump # /usr/sbin/zfs create -b 128*1024 -V <size_in_mb>m rpool/dump # /usr/sbin/dumpadm -d /dev/zvol/dsk/rpool/dump Could you please let me know, if my observations are correct or if I should use different approach ? As far as setting of volume block size is concerned (-b option), how that numbers are to be determined ? Will they be the same in different scenarios or are there plans to tune them in some way in future ? [iii] Is there anything else I should be aware of ? --------------------------------------------------- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
