Messages in this thread | | | Date | Tue, 3 Nov 1998 00:31:46 +0100 (CET) | From | MOLNAR Ingo <> | Subject | Re: Volume Managers in Linux |
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On Mon, 2 Nov 1998, Shawn Leas wrote:
> Because LVM is basically at it's core a physical -> logical address > remapping mechanism, RAID, mirroring, and all the goodies fit REAL > nice in userland.
ugh ... RAID in user-land? Have you thought about the performance implications yet? How do you implement features like 'idle IO bandwith utilization' in user-space (it's part of the kernel-space RAID driver)? How do you boot from such a device? What do you do if the user-space RAID code happens to page-in itself from ... a RAID-device? User-space RAID is, believe me, unbelievably more complex (thus slower) than kernel-space RAID. Frankly, i can see no good reason to put RAID into user-space, only (unnecessary) problems.
-- mingo
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