From: Hans Reiser <reiser@namesys.com>
To: Gregory Maxwell <gmaxwell@gmail.com>
Cc: Edward Shishkin <edward@namesys.com>,
Tom Reinhart <rhino_tom@hotmail.com>,
reiserfs-list@namesys.com
Subject: Re: the " 'official' point of view" expressed by kernelnewbies.org
Date: Tue, 15 Aug 2006 21:23:53 -0700 [thread overview]
Message-ID: <44E29DD9.7030302@namesys.com> (raw)
In-Reply-To: <e692861c0608151814x3e704156j32c2b34b8637a943@mail.gmail.com>
I am skeptical that bitflip errors above the storage layer are as common
as the ZFS authors say, and their statistics that I have seen somehow
lack a lot of detail about how they were gathered. If, say, a device
with 100 errors counts as 100 instances for their statistics..... Well,
it would be nice to know how they were gathered. Next time I meet them
I must ask.
That said, if users want it, there should be a plugin that checks the bits.
I agree that stripe awareness and the need to signal the underlying raid
that a block needs to be recovered is important. Checksumming at the fs
level seems like a reasonable plugin.
I have no opinion on the computational cost of ECC vs. checksums, I will
trust that you are correct.
next prev parent reply other threads:[~2006-08-16 4:23 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-15 21:27 the " 'official' point of view" expressed by kernelnewbies.org Tom Reinhart
2006-08-15 21:55 ` Hans Reiser
2006-08-15 22:06 ` Edward Shishkin
2006-08-15 22:20 ` Hans Reiser
2006-08-16 2:34 ` Tom Reinhart
2006-08-16 3:29 ` Gregory Maxwell
2006-08-15 22:27 ` David Masover
2006-08-15 22:44 ` Edward Shishkin
2006-08-15 23:29 ` David Masover
2006-08-16 1:14 ` Gregory Maxwell
2006-08-16 4:23 ` Hans Reiser [this message]
2006-08-16 15:08 ` Ric Wheeler
2006-08-16 22:48 ` Hans Reiser
2006-08-24 16:11 ` PFC
2006-08-16 2:53 ` Tom Reinhart
-- strict thread matches above, loose matches on Subject: below --
2006-07-24 15:57 Al Boldi
2006-07-24 17:43 ` Horst H. von Brand
2006-07-24 18:46 ` H. Peter Anvin
2006-07-25 4:07 ` Matthew Frost
2006-07-25 4:57 ` Al Boldi
2006-07-25 5:03 ` Jeff Garzik
2006-07-25 8:33 ` the ' 'official' point of view' " Luigi Genoni
2006-07-25 14:35 ` the " 'official' point of view" " Horst H. von Brand
2006-07-25 15:14 ` Lexington Luthor
2006-07-25 20:59 ` Matthias Andree
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