Date: Fri, 23 Apr 2010 09:50:33 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Alexander Motin <mav@freebsd.org>, freebsd-geom@freebsd.org Subject: Re: Switchover to CAM ATA? Message-ID: <201004230950.33999.jhb@freebsd.org> In-Reply-To: <4BD06BD9.6030401@FreeBSD.org> References: <4BD06BD9.6030401@FreeBSD.org>
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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. -- John Baldwin
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