From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 26 Jan 2009 20:51:43 -0800 From: Roman Shaposhnik In-reply-to: To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Message-id: MIME-version: 1.0 Content-type: text/plain; delsp=yes; format=flowed; charset=WINDOWS-1252 Content-transfer-encoding: QUOTED-PRINTABLE References: Subject: Re: [9fans] Changelogs & Patches? Topicbox-Message-UUID: 89898be8-ead4-11e9-9d60-3106f5b1d025 On Jan 26, 2009, at 9:37 AM, erik quanstrom wrote: > the other part of the argument =97 the "write hole" > depends on two things that i don't think are universal > a) zfs' demand for transactional storage Huh?!? > b) a particular raid implentation. > > fancy raid cards I think you missed what I in RAID is supposed to be expanding into ;-) > i don't have any nda that let me see the firmware for a variety of= =20 > raid > devices, but i find it hard to believe that all raid vendors > rewrite the entire stripe whever the write is smaller than > the stripe size and all could rewrite the data before the > parity. Fancy ones might try to do fancy things, but see above. > why do you think that mpi has anything to do with > a plan 9 infastructure? It is the other way around: the fact that Plan9 still doesn't have anything to do with MPI keeps it away from the kind of clusters Ron used to care about (although, in reality, it is all about gcc anyway, so MPI is a lesser argument here). >> May be your numbers are wrong, may be your usage >> patterns are different. Who knows. > > a single cpu on ec2 costs $150/month. I don't know where did you get that #, but my instance on EC2 costs me about $70/m. Oh, wait! I know! It is all because Solaris is so energy efficient ;-) > the machines i have largely cost less than $500. so > that's like $14/month. that doesn't change the equation > much. I believe you are distorting my argument on purpose. So lets just drop this conversation, ok? Thanks, Roman.