Date: Fri, 23 Apr 2010 17:28:15 +0300 From: Alexander Motin <mav@FreeBSD.org> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Switchover to CAM ATA? Message-ID: <4BD1AE7F.2060907@FreeBSD.org> In-Reply-To: <201004230950.33999.jhb@freebsd.org> References: <4BD06BD9.6030401@FreeBSD.org> <201004230950.33999.jhb@freebsd.org>
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John Baldwin wrote: > On Thursday 22 April 2010 11:31:37 am Alexander Motin wrote: >> If ataraid(4) should be reimplemented in GEOM, then how exactly? One >> more separate RAID infrastructure in GEOM (third?) looks excessive. >> Reuse gmirror, gstripe,... code would be nice, but will make them more >> complicated and could be not easy for RAID0+1 (due to common metadata) >> and RAID5 (due to lack of module in a base system). > > Scott's view (which sounds good to me) is that GEOM should include a library > of routines for working with common transforms such as RAID1, striping, etc. > Each ATA RAID vendor format would then consist of a small GEOM module that > used the library routines to manage all the I/O and the bulk of the module > would be managing a specific metadata format. Yes, I remember he proposed it somewhere. Idea is fine. Somebody with sharp axe and lack of fear should just chop half of GEOM modules into small pieces and collect them back. ;) -- Alexander Motin
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