Messages in this thread | | | Date | Sun, 19 Oct 2003 11:25:20 +0200 | From | Pavel Machek <> | Subject | Re: Software RAID5 with 2.6.0-test |
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Hi!
> Now that I'm posting anyway - I thought of a plus for the HW RAID > controllers (hey, they're way behind on the scoreboard so far, so I > might as well be a gentleman and give them a point or two): > *) Battery backed write cache > > This will allow the controller to say 'ok I'm done with your sync()', > way before the data actually reaches the disk platters. For some
Well, this would mean not only battery-backed controller, but battery-backed drives, too. (Unless you want to assume that memory-backup-battery never goes empty).
> While on that topic: SDRAM PCI cards with battery backup can be had > relatively cheap up to at least a few gigabytes. It'd be pretty cool to > have the kernel recognize that for buffer storage. I could see the fun > in doing half a million random writes and a sync(), and having the > system tell me it's done the microsecond I issue the sync().
Sync would still take some time as it still makes sense to do writeback... Main memory is still faster than PCI. Pavel -- Pavel Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...
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