User:Tomato
just my personal scrapbook
lessfs
Sizes of different databases in lessfs
With a 64k blocksize administration overhead would be approx 5~10% of the size of blockdata.tch
Good all-round mount options
-o kernel_cache,negative_timeout=0,entry_timeout=0,attr_timeout=0,use_ino,readdir_ino\
,default_permissions,allow_other,big_writes,max_read=65536,max_write=65536
Filesystem, mounting but not working
Each and every partition with datafiles need 10% of free space, lessfs will freeze all writes to the partition for as long as the free space isn't aviable.
Version 1.0.4 has new config parameters:
MIN_SPACE_FREE=2 MIN_SPACE_CLEAN=5 CLEAN_PROGRAM=/tmp/clean.sh
MIN_SPACE_FREE defines minimum space left (in percent?) on the device, MIN_SPACE_CLEAN defines the amount of space left that triggers the CLEAN_PROGRAM
Bucket sizes
Usually when performance drops after reaching a certain database size this indicates that the bucketsize selected in /etc/lessfs.cfg is to low. The default 'lessfs.cfg' example included with the code only allows the database to grow up to: 2GB after which performance degrades.
To store 50GB the bucketsize should be at least : 27262976
2MB bucketsize equals 1000000 database entries. To store 50GB : 50GB = 50*1024*1024*1024 = 53687091200 bytes 53687091200/4096 (4k blocksize) = 13107200 entries in the databases. 13107200/1000000 (divide by 10^6 entries) 13 *2 (10^6 entries requires 2MB) = 26 26 * 1024*1024 = 27262976 -> This is the bucketsize you need for 50GB with a 4k blocksize.
(from http://sourceforge.net/projects/lessfs/forums/forum/932600/topic/3304815)
If you ever need to change the _BS settings, just unmount lessfs, change the settings, mount lessfs and run defrag.
Files to put on different spindles
For max performance compile with –with-sha3 and put the FILEBLOCK and BLOCKUSAGE databases each on there own raid one disk set. The faster these disks are the better. BLOCKDATA can be on raid5/6. (from http://www.lessfs.com/wordpress/?p=295)
Log parser
grep 'lessfs\[8118\]' /var/log/messages.log | grep -Eo \
'size .* bytes \: lzo compressed bytes .* and .* duplicate blocks' |\
awk ' { SUM += $2 ; SUMCP += $8 ; DUP += $10 } \
END { print "total size " SUM/1024/1024/1024 "GiB, compressed size " \
SUMCP/1024/1024/1024 "GiB (ratio 1 : " SUM/SUMCP ") with " DUP\
" duplicate blocks (" DUP*64/1024/1024 "GiB deduplicated)" }'
change lessfs\[8118\] to the PID of lessfs you want to monitor and DUP*64 to the block size in kiB you use in it.
Configuring Samba Domain/File server.
What we want
basically, everything that Samba has to offer:
- save and share files (duh)
- edit files/folders ACLs to the maximum extent possible for Samba
http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/AccessControls.html- mapping of permission inheritance
- save file attributes (archive, system, hidden, read only) on samba server without screwing UNIX permissions
- have the ability to manage users/computers in domain without the need to use UID 0 (root) account
http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/rights.html - automatic creation of user folders
- Previous Version share feature
- enforcement of log-on hours, password complexity, password age and requests for password change, and group policies
http://wiki.samba.org/index.php/Implementing_System_Policies_with_Samba
http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/PolicyMgmt.html - view and set file system quota
- time server/syncronisation
- printing with generic drivers to CUPS (optional)