Date: Sat, 5 Mar 2005 10:26:37 +1100 From: Peter Jeremy <PeterJeremy@optushome.com.au> To: Jason Young <jyoung@ziggy.evelocity.net> Cc: hackers@freebsd.org Subject: Re: FUD about CGD and GBDE Message-ID: <20050304232636.GB4394@cirb503493.alcatel.com.au> In-Reply-To: <20050304161201.B87252@ziggy.evelocity.net> References: <200503022115.j22LFnWk083926@marlena.vvi.at> <20050304183747.GS57256@cirb503493.alcatel.com.au> <20050304161201.B87252@ziggy.evelocity.net>
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On Fri, 2005-Mar-04 16:37:05 -0600, Jason Young wrote: >Why not put a flash chip into the drive's onboard electronics, of the same >size as the drive's cache, or the max possible size of all outstanding >cached writes? That seems to be a better idea. ISTR that once upon a time, vendors made chips that had RAM shadowed by EEPROM which gave you the non-volatility of EEPROM with the read/write performance of RAM. Since the EEPROM was written at once, you only needed 10-20 msec hold-up to preserve your RAM. >At least some modern drives (seen this on HP/Compaq servers, etc) already >have flash-upgradeable firmware. It's just a matter of adding a little >more. You would use it only when power fails, so it's not like you would >wear it out. I think that most modern drives have very little firmware in ROM - just a bootstrap - with most of the firmware stored on the disk itself. -- Peter Jeremy
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