ru.unix.bsd

 
 - RU.UNIX.BSD ------------------------------------------------------------------
 From : Slawa Olhovchenkov                   2:5030/500     09 Mar 2007  12:36:18
 To : All
 Subject : Вести с полей
 -------------------------------------------------------------------------------- 
 

 
 mjacob      2007-02-27 04:01:58 UTC
 
   FreeBSD src repository
 
   Modified files:
     etc/mtree            BSD.include.dist
     sbin/geom/class      Makefile
     sys/conf             NOTES files
     sys/modules/geom     Makefile
   Added files:
     sbin/geom/class/multipath Makefile geom_multipath.c
     sys/geom/multipath   g_multipath.c g_multipath.h
     sys/modules/geom/geom_multipath Makefile
   Log:
   First cut at GEOM based multipath. This is an active/passive{/passive...}
   arrangement that has no intrinsic internal knowledge of whether devices
   it is given are truly multipath devices. As such, this is a simplistic
   approach, but still a useful one.
 
   The basic approach is to (at present- this will change soon) use camcontrol
   to find likely identical devices and and label the trailing sector of the
   first one. This label contains both a full UUID and a name. The name is
   what is presented in /dev/multipath, but the UUID is used as a true
   distinguishor at g_taste time, thus making sure we don't have chaos
   on a shared SAN where everyone names their data multipath as "Fred".
 
   The first of N identical devices (and N *may* be 1!) becomes the active
   path until a BIO request is failed with EIO or ENXIO. When this occurs,
   the active disk is ripped away and the next in a list is picked to
   (retry and) continue with.
 
   During g_taste events new disks that meet the match criteria for existing
   multipath geoms get added to the tail end of the list.
 
   Thus, this active/passive setup actually does work for devices which
   go away and come back, as do (now) mpt(4) and isp(4) SAN based disks.
 
   There is still a lot to do to improve this- like about 5 of the 12
   recommendations I've received about it,  but it's been functional enough
   for a while that it deserves a broader test base.
 
   Reviewed by: pjd
   Sponsored by: IronPort Systems
   MFC: 2 months
 ... Вам бы все булочки, девочки и сметана.
 --- GoldED+/BSD 1.1.5
  * Origin:  (2:5030/500)
 
 

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