On 14.12.2010 23:27, Les Mikesell wrote: > On 12/14/2010 4:16 PM, Markus Falb wrote: >> On 14.12.2010 22:49, Jason T. Slack-Moehrle wrote: >>> Hi, >>> >>>> If you dont know in advance how your storage is allocated the best way, >>>> use lvm. The space you dont need today is in the pool and be it >>>> /var/www/html or swap or whatever assign it as needed in the future. >>>> >>>> Note that its maybe better to not put /boot into lvm. >>>> >>>> I would suggest >>>> >>>> /dev/md0 -> /boot >>>> /dev/md1 -> lvm with all other partitions including swap >>> >>> OK, I have done this, I need to create mount points and I am not sure how to initially size. >> >> My idea was to assign minimum at now. It could go like this: >> >> lvm volume group -> 1000GB >> >> for the system: >> lvm logical volume for / -> 1GB >> lvm logical volume for /var -> 1GB >> lvm logical volume for /usr -> 1GB >> >> lvm logical volume for /var/www/html -> 50GB >> >> Now you have assigned 53GB out of the 1000 and the other 947GB remains >> dynamically assignable from the lvm volume group. >> >> If you need more space in one of the partitions, just grow it, out of >> the pool of 947GB. Logical Volumes can be resized online and many >> filesystems can be grown online (mounted) too. If the initial 1GB for >> some partition proves to be to low, e.g. it has to be increased on every >> server you have than adjust it to initial 2GB or whatever size is >> adequat for you. I am not after numbers at all. My point is: If you dont >> know how to partition, assign at minimum, allowing for future flexibility. > > But this only helps if you don't know where you will need to grow. If > you know it is going to be under /var, just give it all the space you > have in the first place and avoid the overhead of lvm. To quote Jason, the OP: "what should my SWAP space be" ? How should I know ? lvm to the rescue. lvm also helps if you want to have additional partitions. Maybe one day you recognise that a separate partition for /var/log/httpd would be a good thing. You are talking about the performance overhead ? Not sure about that. I think the flexibility you gain makes it at least worth thinking about it. Said that, I would be interested in hearing about disadvantages of lvm. -- Best Regards, Markus Falb
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