Petr "Qaxi" Klíma wrote:
Farkas Levente napsal(a):
hi, we've a few 10-20 server in a lan each has 4-8 hdd. we'd like to create one big file server on these server hard disks and we'd like to create it in a redundant way ie:
- if one (or more) of the hdd or server fails the whole filesystem still
usable and consistent.
- any server in this farm can see the same storage/filesystem.
it's someting a big network raid5-6... storage where we have about 40<partition added to the same network volume. and there is an fs over it which hide all internal network raid functionality. is there any such solution? i can't find any way to do this on our linux servers.
what about souch FS blocks path
server->gfs->LVM-> raid1(disc0)-> iscsi initiator->local-eth0->LANswitch0->remote-eth0->iscsi-target-on_file_server0->LVM->raid(1,5,6,...)->HDD(1,2,3,4,......)
\->LVM-> raid1(disc1)-> iscsiinitiator->local-eth1->LANswitch1->remote-eth0->iscsi-target-on_file_server1->LVM->raid(1,5,6,...)->HDD(1,2,3,4,......)
\-------------||----------------in souch setup you have no single point of failure
bacause of money you can decrease number of switches (FE to 2 and connect each server and FS to both of them)
If you do not need concurent access from 1+ servers to one fs (partition, logicalvolume, same file ...) you do not need gfs ..
sorry this graph is a bit complicated:-( how comes the iscsi into this image? iscsi under raid? can you explain it a bit more detailed? thanks.