From: Nix <nix@esperi.org.uk>
To: Eric Wheeler <bcache@lists.ewheeler.net>
Cc: kent.overstreet@gmail.com,
Igor Pavlenko <ipavlenko.mail@gmail.com>,
linux-bcache@vger.kernel.org
Subject: Re: bcache crashes at boot time
Date: Thu, 22 Jun 2017 12:24:05 +0100 [thread overview]
Message-ID: <874lv8tgdm.fsf@esperi.org.uk> (raw)
In-Reply-To: <alpine.LRH.2.11.1706220045190.17052@mail.ewheeler.net> (Eric Wheeler's message of "Thu, 22 Jun 2017 00:47:52 +0000 (UTC)")
On 22 Jun 2017, Eric Wheeler verbalised:
> The physical blocksize must be the same as the cachedev IIRC. If 4k, use
> -w 4k in make-bcache. There's a thread somewhere discussing those
> details.
They are both 4096, and my make_bcache line was
make_bcache -B /dev/md/fast -C /dev/ssd2 --block 4096 --bucket 2M --data-offset $((2*30720))
which should be appropriate, I think? (This was my second attempt: I
came out with a number of unprintable words when I found that
make_bcache doesn't try to figure out an appropriate data offset when
used atop a RAID array, so the default options misalign the entire
thing.)
(Something I didn't make clear enough is that there there were several
successful restarts and remounts before the failed one.)
This is a writethrough cache, so it can't be a writeback problem (thank
goodness).
--
NULL && (void)
prev parent reply other threads:[~2017-06-22 11:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-05 12:38 bcache crashes at boot time Igor Pavlenko
2017-06-20 22:04 ` Eric Wheeler
2017-06-21 11:05 ` Nix
2017-06-21 17:10 ` Kai Krakow
2017-06-21 21:57 ` Nix
2017-06-22 0:47 ` Eric Wheeler
2017-06-22 11:24 ` Nix [this message]
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