From: Guido Winkelmann <guido-ceph@thisisnotatest.de>
To: ceph-devel@vger.kernel.org
Subject: Re: Cannot mount ceph filesystem: error 5 (Input/Output error)
Date: Wed, 07 Dec 2011 15:38:57 +0100 [thread overview]
Message-ID: <1871670.5qvOuPR13S@pc10> (raw)
In-Reply-To: <CAF3hT9DSf5Xaw00PUFHp5OtGAabka+Wc6H4vVkK24PJGNizd4Q@mail.gmail.com>
Am Dienstag, 6. Dezember 2011, 11:51:45 schrieben Sie:
> PG = "placement group". When placing data in the cluster, objects are
> mapped into PGs, and those PGs are mapped onto OSDs.
How does the Object->PG mapping look like, do you map more than one object on
one PG, or do you sometimes map an object to more than one PG? How about the
mapping of PGs to OSDs, does one PG belong to exactly one OSD?
Does one PG represent a fixed amount of storage space?
Guido
next prev parent reply other threads:[~2011-12-07 14:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-25 16:53 Cannot mount ceph filesystem: error 5 (Input/Output error) Guido Winkelmann
2011-11-25 18:54 ` Wido den Hollander
2011-12-02 16:24 ` Guido Winkelmann
2011-12-02 19:29 ` Samuel Just
2011-12-03 14:21 ` Guido Winkelmann
2011-12-06 19:51 ` Gregory Farnum
2011-12-07 14:38 ` Guido Winkelmann [this message]
2011-12-07 18:00 ` Tommi Virtanen
2011-12-07 18:03 ` Tommi Virtanen
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