venti (p9p) linux server
tags: technology tutorial
give actual instruction please for running venti on vultr x alpine?
1. Install Plan 9 from User Space, following the instructions here http://swtch.com/plan9port/
select an existing volume or create a virtual device on zfs:
might be nicer if we use lvm which is more standard. i can instruct above to use lvm to partition the system disk. the lvm devices can be used to hold the index and bloom filter partitions on a fast SSD and the log can live on vultr block storage.
zfs create -V 100G rpool/fossil
ls -l /dev/zvol/rpool/fossil
The bloom filter should be sized so that nhash × nblock <= 0.7 × b, where nblock is the expected number of blocks stored on the server and b is the bitmap size in bits. The false positive rate of the bloom filter when sized this way is approximately 2–nblock. Nhash less than 10 are not very useful; nhash greater than 24 are probably a waste of memory.
index: 10G (5% of log data)
bloom filter: 4G (2% of log data?)
i'd like some kind of equation for provisioning these.
% venti/fmtisect isect0. /tmp/disks/isect0
% venti/fmtisect isect1. /tmp/disks/isect1
% venti/fmtarenas arenas0. /tmp/disks/arenas &
% venti/fmtbloom /tmp/disks/bloom &
% venti/fmtindex venti.conf
% hget http://$sysname/storage