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Hi, i'm currently running Gentoo on a RAID0 setup on some Sata disks |
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using a Jmicron chip from an Asus P6T board. I'm using a fakeraid due |
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to dualboot restrictions. My whole Gentoo system is on the raid0 |
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device so i use an initramfs to bootup. I've been running with this |
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setup for some time, but since i migrated to baselayout2+openrc i |
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didn't understand why i need /etc/init.d/lvm to start at boot as i |
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have no lvm setup. Today i was doing some research and some questions |
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appeared: |
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|
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* Every where says i need "<*> RAID support -> <* > RAID-0 |
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(striping) mode" in kernel for fakeraid to work, but my system still |
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boots while disabling those options, are they really needed? i don't |
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understand why it is supposed to be needed. (Is it only for mdadm |
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usage?) |
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|
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* Is "SCSI device support -> <*> RAID Transport Class" option needed? |
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What is supposed to do? I think raid features are provided by jmicron |
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driver and kernel understaands how RAID works due to "Multiple devices |
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driver support (RAID and LVM) -> <*> Device mapper support ", isn't |
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it? |
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|
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* Last question is, after migrating to openrc i noticed that lvm2 |
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package provides device-mapper tools to manage the array, but i do not |
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want /etc/init.d/lvm to start at boot as i do not use any lvm setup, i |
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just would like to get /dev/mapper/ correctly populated using |
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something like dmraid -ay. I've tried removing lvm from boot and |
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adding device-mapper instead but /dev/mapper is not populated. How |
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should i proceed to get rid of lvm script and /dev/mapper populated, |
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do i need /etc/dmtab to work? Then why would one want to use mdadm |
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instead of device-mapper, which are the advatges/disadvantages on each |
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other? i know mdadm needs an optional /etc/mdadm.conf file to work, |
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and using mdadm one could stop/start the array, add more disks to the |
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array etc But do mdadm need a boot up script to work? |
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|
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As you can see i'm a bit confused about what's best/suits best mdadm |
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or device-mapper and why are those kernel settings needed. Thanks a |
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lot in advanced :) |
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