From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: mdadm 2.6.x regression, fails creation of raid1 w/ v1.0 sb and internal bitmap Date: Thu, 18 Oct 2007 23:45:14 -0400 Message-ID: <4718284A.1040400@tmr.com> References: <170fa0d20710170837g1b0cd549w3b7fe8e663a01b7e@mail.gmail.com> <4716769E.5030508@tmr.com> <170fa0d20710171421l4ff62ebdwdef307e71a2ad30d@mail.gmail.com> <471754D8.2060909@tmr.com> <18200.6501.186871.539817@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <18200.6501.186871.539817@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: Mike Snitzer , linux-raid@vger.kernel.org List-Id: linux-raid.ids Neil Brown wrote: > On Thursday October 18, davidsen@tmr.com wrote: > >> Unless there's a substantial benefit from using the 1.0 format, you >> might want to go with something which works. >> > > I am every grateful to the many people who do not just find work > arounds, but report problems and persist until they get fixed. > > Obviously everyone should choose the path that suits them best, but > I'd rather we didn't discourage people who are working to get a bug > fixed. > Giving them a way to get working and copying you directly seems to be a reasonable compromise between ignoring the problem and leaving the original poster to think software raid is neither reliable nor supported. I have never seen any guidance on when 1.0 or 1.2 format is better than 1.1, perhaps that can go on the documentation queue. >> I would suggest using >> --bitmap-chunk, but the man page claims it doesn't apply to internal >> bitmaps. It also claims the bitmap size is chosen automatically to best >> use available space, but "doesn't work" seems an exception to "best >> use." ;-) >> > > In this case, it does work, and it is best use. It just appears that > the 'available space' is not truly available - read error. > It's not always clear without dmesg if read error is hardware :-( I certainly assumed it was config or software in nature. -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979