Hia You can refeer to http://www.gluster.org/docs/index.php/GlusterFS_Translators_v1.3#ALU_Scheduler for complete information, ALU is Adaptative Least Usage a intelligent scheduler based on submodules volume bricks type cluster/unify subvolumes brick1 brick2 brick3 brick4 option scheduler alu # use the ALU scheduler option alu.limits.min-free-disk 5% # Don't create files one a volume with less than 5% free diskspace option alu.limits.max-open-files 10000 # Don't create files on a volume with more than 10000 files open # When deciding where to place a file, first look at the disk-usage, then at # read-usage, write-usage, open files, and finally the disk-speed-usage. option alu.order disk-usage:read-usage:write-usage:open-files-usage:disk-speed-usage option alu.disk-usage.entry-threshold 2GB # Kick in if the discrepancy in disk-usage between volumes is more than 2GB option alu.disk-usage.exit-threshold 60MB # Don't stop writing to the least-used volume until the discrepancy is 1988MB option alu.open-files-usage.entry-threshold 1024 # Kick in if the discrepancy in open files is 1024 option alu.open-files-usage.exit-threshold 32 # Don't stop until 992 files have been written the least-used volume # option alu.read-usage.entry-threshold 20% # Kick in when the read-usage discrepancy is 20% # option alu.read-usage.exit-threshold 4% # Don't stop until the discrepancy has been reduced to 16% (20% - 4%) # option alu.write-usage.entry-threshold 20% # Kick in when the write-usage discrepancy is 20% # option alu.write-usage.exit-threshold 4% # Don't stop until the discrepancy has been reduced to 16% # option alu.disk-speed-usage.entry-threshold # NEVER SET IT. SPEED IS CONSTANT!!! # option alu.disk-speed-usage.exit-threshold # NEVER SET IT. SPEED IS CONSTANT!!! option alu.stat-refresh.interval 10sec # Refresh the statistics used for decision-making every 10 seconds # option alu.stat-refresh.num-file-create 10 # Refresh the statistics used for decision-making after creating 10 files end-volume El Jueves, 17 de Enero de 2008 03:15, An. Dinh Nhat escribió: > > I have a question.I don’t understand Parameter below.Please,you can explain this Parameter for me.Thanks you. > > * ALU Scheduler Volume example > > volume bricks > > type cluster/unify > > subvolumes brick1 brick2 brick3 brick4 > > option scheduler alu # use the ALU scheduler > > option alu.limits.min-free-disk 5% > > option alu.limits.max-open-files 10000 > > option alu.order disk-usage:read-usage:write-usage:open-files-usage:disk-speed-usage > > option alu.disk-usage.entry-threshold 2GB > > option alu.disk-usage.exit-threshold 60MB > > option alu.open-files-usage.entry-threshold 1024 > > option alu.open-files-usage.exit-threshold 32 > > option alu.read-usage.entry-threshold 20% > > option alu.read-usage.exit-threshold 4% > > option alu.stat-refresh.interval 10sec > > option alu.stat-refresh.num-file-create 10 > > > > Thanks & Best Regard, > > Đinh Nhật An > > System Engineer > > System Operation - Vinagame JSC > > Email:andn@xxxxxxxxxxxxxxx - Yahoo:atuladn > > Vinagame JSC - 459B Nguyễn Đình Chiểu. Q3 , HCMC , VietNam > > Office phone: 8.328.426 Ext 310 > > > > > > -----Original Message----- > From: Angel [mailto:clist@xxxxxx] > Sent: Thursday, January 17, 2008 3:37 AM > To: An. Dinh Nhat > Cc: gluster-devel@xxxxxxxxxx > Subject: Re: AFR Translator have problem > > > > > > I see, glusterfs developers have this point in mind on the roadmap: > > > > for the 1.4 release roadmap says: > > > > active self-heal - log and replay failed I/O transactions > > brick hot-add/remove/swap - live storage hardware maintenance > > > > so till that day, we the users have to figure out how to force lazy afrs into doing their job :-) > > > > One issue positive is that this way you can control how much resources are devoted to afr, the more you touch files the more replication occurs and > > in the event of high net or cpu pressure, lowering touching speed should lower afr requirements. > > > > Your mileage may vary. :-P > > > > Perhaps GlusterFS client (maybe servers) should talk to a housekeeping daemon to acomplish this tasks instead of over-engineering the code to do as much things as required.. > > > > Let's wait what developers have to say about this issue... > > > > Regards Angel > > > > El Miércoles, 16 de Enero de 2008 An. Dinh Nhat escribió: > > > Thanks your answer. > > > > > > I understand when I touch file after server 3 go on when afr issue.Howerver if I have 2 server.After I edit add one server in glusterfs-client.vol, and Mount point have 40000 file,size: 800 Gb.How to AFR replication file to server3 automatic? > > > > > > -----Original Message----- > > > From: Angel [mailto:clist@xxxxxx] > > > Sent: Wednesday, January 16, 2008 11:16 PM > > > To: gluster-devel@xxxxxxxxxx > > > Cc: An. Dinh Nhat > > > Subject: Re: AFR Translator have problem > > > > > > I thinks AFR replication occurs on file access > > > > > > try to touch all files from the client and probably you will trigger replication onto server3 > > > > > > client --> creates files on AFR(server1,server2) > > > > > > server 3 goes up now we have AFR(server1,server2,server3) > > > > > > you wont see any files on server3 > > > > > > > > > now touch files from the client, AFR will be triggered > > > > > > now you will see touched files on server3 > > > > > > ive made similar test on local scenarios client --> local AFR(dir1,dir2) > > > > > > i copied a file test.pdf to my mountpoint and it got replicated on both 'remote' dirs. Next i deleted one copy on the exported 'remote' directories (dir1) > > > After that, i opened the pdf file on the mount point, it opened right and i could see now dir1 was storing a new copy of test.pdf again. > > > > > > it seems for me looking at the code that things mostly occur on file operations because xlator work intercepting fuse calls along the path to posix modules. > > > > > > my tests showed things occurring like this... > > > > > > > > > Regards Angel > > > El Miércoles, 16 de Enero de 2008 Anand Avati escribió: > > > > Dinh, > > > > can you post your spec files, mentioning the order of events in terms of > > > > subvolumes? > > > > > > > > thanks, > > > > avati > > > > > > > > ---------- Forwarded message ---------- > > > > From: An. Dinh Nhat <andn@xxxxxxxxxxxxxxx> > > > > Date: 16-ene-2008 16:07 > > > > Subject: AFR Translator have problem > > > > To: gluster-devel-owner@xxxxxxxxxx > > > > > > > > Hi. > > > > > > > > I set up 3 server using > > > > GlusterFS<http://www.gluster.org/docs/index.php/GlusterFS>.Begin > > > > I start 2 server after From Client I mount > > > > GlusterFS<http://www.gluster.org/docs/index.php/GlusterFS>and copy 10 > > > > file on volume > > > > gluster.After I start 'server 3' however I don't see any file on 'server > > > > 3',I think AFR Translator have problem. > > > > > > > > > > > > > > > > [root@client examples]# glusterfs -V > > > > > > > > glusterfs 1.3.7 built on Dec 18 2007 > > > > > > > > > > > > > > > > > > > > > > > > Thanks & Best Regard,[image: victory] > > > > Đinh Nhật An > > > > System Engineer > > > > > > > > System Operation - Vinagame JSC > > > > Email:andn@xxxxxxxxxxxxxxx - Yahoo:atuladn > > > > *V*inagame *J*SC - 459B Nguyễn Đình Chiểu. Q3 , HCMC , VietNam > > > > > > > > Office phone: 8.328.426 Ext 310 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- ---------------------------- Clister UAH ----------------------------
