Re: Solaris ZFS on Linux [Was: Re: the " 'official' point of view"expressed by kernelnewbies.org regarding reiser4 inclusion]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 

Ian Stirling wrote:

David Masover wrote:

David Lang wrote:


On Mon, 31 Jul 2006, David Masover wrote:
Oh, I'm curious -- do hard drives ever carry enough battery/capacitance to cover their caches? It doesn't seem like it would be that hard/expensive, and if it is done that way, then I think it's valid to leave them on. You could just say that other filesystems aren't taking as much advantage of newer drive features as Reiser :P
there are no drives that have the ability to flush their cache after they loose power.
Aha, so back to the usual argument: UPS! It takes a fraction of a second to flush that cache. 

You probably don't actually want to flush the cache - but to write
to a journal.
16M of cache - split into 32000 writes to single sectors spread over
the disk could well take several minutes to write. Slapping it onto
a journal would take well under .2 seconds.
That's a non-trivial amount of storage though - 3J or so, 40mF@12V -
a moderately large/expensive capacitor.
Before we get ahead of ourselves, remember: ~$200 buys you a huge amount of battery storage. We're talking several minutes for several boxes, at the very least -- more like 10 minutes. 

But yes, a journal or a software suspend.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/
[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux