#ceph IRC Log

Index

IRC Log for 2011-06-26

Timestamps are in GMT/BST.

[0:39] * verwilst_ (~verwilst@dD576F54C.access.telenet.be) Quit (Quit: Ex-Chat)
[0:40] * gregorg_taf (~Greg@78.155.152.6) has joined #ceph
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[13:42] <sugoruyo> hey guys, is there anyway to see how much space a certain file is actually using in ceph? for example a 2k file in a local fs normally uses 4k when the fs uses 4k-blocks
[13:43] <sugoruyo> also how does ceph store small files? if i give it a 1 gig file it will obviously by split into multiple objects, do smaller files (e.g. 2k or 10k files) get stored in a single object?
[16:32] <bchrisman> sugoruyo: ceph doesn't really have a way to track st_blocks.. while it does provide sparse files, there's currently no way to tell how much of that file has been filled. Since I/O goes directly to the OSDs without making at stop in the MDS, and the OSDs don't really know about files themselves, the client would need to publish data about what blocks have been written to the MDS, which it currently doesn't do. Or at least, that's my und
[17:20] * bchrisman (~Adium@c-98-207-207-62.hsd1.ca.comcast.net) Quit (Quit: Leaving.)
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[19:02] <greglap> sugoruyo: what bchrisman said is right about the presentation
[19:03] <greglap> files which are smaller than the stripe unit (which I think defaults to 4MB just like the object size) aren't going to get split up, but they don't use up extra space ??? the amount of actual space they take up will be the same as if you stored them in the underlying local FS
[19:24] * bchrisman (~Adium@c-98-207-207-62.hsd1.ca.comcast.net) Quit (Quit: Leaving.)
[20:16] <sugoruyo> greglap: so a 2KB file takes up 4KB (since my f/s for the OSD data uses 4KB blocks), stored in a single object, in each OSD it's replicated on?
[20:17] <sugoruyo> another question: i have made a custom crush-map with customised weights, mkcephfs'd using it, but with ceph osd dump i see all OSDs with weight 1, shouldn't i be seeing the weight i set for them?
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