Date: Sun, 06 Mar 2011 16:11:57 +0200 From: Alexander Motin <mav@FreeBSD.org> To: FreeBSD-Current <freebsd-current@freebsd.org>, freebsd-geom@freebsd.org, freebsd-scsi@freebsd.org Cc: Warner Losh <imp@FreeBSD.org> Subject: RFC: graid, first step done. Message-ID: <4D73962D.3080908@FreeBSD.org>
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Hi. I would like to present for review and testing results of my and M. Warner Losh work on new GEOM-based ataraid(4) replacement - graid. At this moment we have implemented all required core functionality and the first set of transformation and metadata modules. Now we have implemented transformation modules to support such RAID levels: RAID0, RAID1, RAID1E, RAID10 and CONCAT. For all these levels all such features as reading, writing, rebuilding, I/O errors recovery and kernel dumping are supported. Metadata modules now written for Intel and JMicron RAID BIOS formats. JMicron format is minimalistic by itself, while Intel format is much more sophisticated, and now we support all of it features, except RAID level migration. Work on Promise (used by AMD) and SiliconImage formats is now in progress. Support for other metadata formats and RAID levels planned later. If somebody wants to help -- feel free to contact me to coordinate work. Patches are existing for HEAD, 8-STABLE and 7-STABLE branches: http://people.freebsd.org/~mav/graid/graid-head-20110305.diff http://people.freebsd.org/~mav/graid/graid-8-20110305.diff http://people.freebsd.org/~mav/graid/graid-7-20110305.diff Patches for HEAD and 8-STABLE are not very invasive and, if everything goes well, going to be committed to HEAD in few weeks. Patch for 7-STABLE, except graid, also includes massive update of the ATA and CAM code from 9-CURRENT. It will not be committed due to numerous ABI breakages, but can be interesting to some people. Just be aware that main focus there was on ATA subsystem -- SCSI drivers were not tested. Once completed, this project should remove last major show stopper for enabling CAM-based ATA subsystem by default in 9.x branch. I would really like it to be done before 9.0 release. Special thanks to Cisco Systems, Inc. and iXsystems, Inc. for sponsoring this project. -- Alexander Motin
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