no LVM support (kernel-2.6-beta8)??

jcome

why?



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jcome

6. Status Of LVM And EVMS In 2.6
23 Aug  (6 posts) Subject: "evms or lvm?"
Topics: Disk Arrays: EVMS, Disk Arrays: LVM, Disk Arrays: RAID, Ioctls
People: Jose Luis Domingo Lopez, Wakko Warner, Wichert Akkerman

Voicu Liviu was planning to migrate to a 2.6 kernel, and wanted to know whether LVM or EVMS was the best way to handle multiple disk volumes. Jose Luis Domingo Lopez replied:

    2.6.0 will have many changes with respect to LVM and EVMS. LVM is updated to newer version 2 (LVM2), based on DM (Device Mapper), sort of a simplified in-kernel LVM that just handles discovering the drives. Updated userspace utilities (LVM2) are already available to drive this.

    On the other part, EVMS was completely redesigned. Former EVMS implementation was duplicating too much code, and in general it was regarded as a bad implementation on a very good idea, so the people at IBM in charge on EVMS development took what it look to everyone as a very clever move, and for 2.6.x they implemented EVMS on top of DM. User space utilities for EVMS are (from the user's point of view) the same as before, but now the inner details are different: no reimplementation of software RAID, no reimplementation of LVM, etc.

    Have a look at both projects websites to get more accurate and detailled information about them:
    http://evms.sourceforge.net/
    http://www.sistina.com/products_lvm.htm

Wakko Warner remarked, "I noticed the kernel doesn't have LVM as an option now. Does both projects just use the DM from userspace?" Wichert Akkerman confirmed that yes, they did. Voicu Liviu asked for some more explanation, and Jose replied:

    In 2.6.x there is just support for Device Mapper. From "Multi-device support (RAID and LVM)" you can see:

  x x        <M>   Device mapper support
  x x        

     ioctl interface version 4

    Both LVM2 and EVMS (from version 2.0.0) use Device Mapper. For LVM2 you just need to get updated userspace tools from your vendor or directly from www.sistina.com. For EVMS to work,

greenforce

2.6 现在也没有 ATARAID 支持