Wojciech Puchar wrote:
AFAIK UFS try to spread data quite evenly on disk to different cylinder
group - for large files, so small files can get it's space near inodes
etc..
Yes, UFS leaves some free space in each cylinder group if it can so that it
can grow (especially small) files locally; big files will get spread across
cylinder groups as a result.
but i would like to clear things up:
i will set up say 3 disks with gconcat and make one partition for all
data on it. then i will populate it with all things and use it.
will the data be quite spread on disks, so accesses to different things
could be done in parallel to 3 disks, or will it rather use space on one
disk first, then on second then on third.
i'm asking about it as i prefer gconcat over gstripe as i can add more
disks to gconcat and do growfs then making system EASILY expandable.
Using a stripe is going to give reliably-balanced I/O load to the underlying
physical disks. If the concat is mostly empty, then no, I/O won't be evenly
balanced. If you mostly fill it up and are doing multithreaded I/O to lots of
files scattered all around, than concat should be OK.
--
-Chuck
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