Date: Sat, 09 Aug 2014 00:52:36 -0500 From: Scott Bennett <bennett@sdf.org> To: kpneal@pobox.com Cc: freebsd-questions@freebsd.org Subject: Re: gvinum raid5 vs. ZFS raidz Message-ID: <201408090552.s795qaQS027351@sdf.org> In-Reply-To: <20140808193032.GA42189@neutralgood.org> References: <201408020621.s726LsiA024208@sdf.org> <alpine.BSF.2.11.1408020356250.1128@wonkity.com> <53DCDBE8.8060704@qeng-ho.org> <201408060556.s765uKJA026937@sdf.org> <53E1FF5F.1050500@qeng-ho.org> <201408070831.s778VhJc015365@sdf.org> <alpine.BSF.2.11.1408071034510.64214@mail.fig.ol.no> <201408070936.s779akMv017524@sdf.org> <alpine.BSF.2.11.1408071226020.64214@mail.fig.ol.no> <201408071106.s77B6JCI005742@sdf.org> <20140808193032.GA42189@neutralgood.org>
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kpneal@pobox.com wrote:
> On Thu, Aug 07, 2014 at 06:06:19AM -0500, Scott Bennett wrote:
> > Even just as parity bits, those would amount to only one bit per
> > eight bytes, which seems inadequate. OTOH, the 520 bytes thing is
> > tickling something in my memory that I can't quite seem to recover, and
>
> Weren't those drives used on the AS/400?
I never worked with the AS/400 and paid little attention to stuff
about it, so I really don't know. I had assumed that they used the same
disk drive lines that were used on the mainframes. IBM kind of abandoned
sectored drives after the 1311 and switched to all count-data|count-key-data
drives, so if the AS/400 used the drives being made at the time the AS/400
made its appearance in the market, then the 520 bytes stuff was in relation
to non-IBM systems. OTOH, if IBM introduced a new line of drives for the
AS/400, then they could have been sectored drives with 520-byte sectors.
Scott Bennett, Comm. ASMELG, CFIAG
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