#ceph IRC Log

Index

IRC Log for 2015-06-28

Timestamps are in GMT/BST.

[0:00] <shawniverson> rbd shared block device
[0:00] <janos> shared block device?
[0:00] <janos> that doesn't sound good
[0:01] <shawniverson> trying to multipath iscsi for vmware
[0:01] <janos> are you using a clustering FS with it?
[0:01] <janos> but when you say shared, do you mean concurrent use from multiple places?
[0:02] <shawniverson> each node is an iscsi target to /dev/rbd1
[0:02] <shawniverson> have vmware set up to fix on one target and failover to another if it goes down
[0:02] <janos> the word "shared" is alarming though. neither iscsi nor multipath really imply sharing per se
[0:03] <janos> as long as there isn't concurrent use on the block device
[0:04] * nsoffer (~nsoffer@109.65.255.114) Quit (Quit: Segmentation fault (core dumped))
[0:05] <shawniverson> had to use --image-shared otherwise I couldn't get the iscsi to bind to /dev/rbd1 due to lock from first node
[0:05] <shawniverson> when I created image
[0:05] <janos> gotcha. a hot and a cold. both pointing to it but only one active at a time
[0:05] <shawniverson> yes
[0:06] <TheSov2> did u disable write caching shawniverson
[0:06] <TheSov2> http://ceph.com/docs/master/rados/configuration/filesystem-recommendations/
[0:06] <TheSov2> shawniverson, what do you mean by shared block device?
[0:06] <TheSov2> unless you have a clustered filesystem, like vmfs you should never mount a block device more than 1 time
[0:06] <janos> haha he finds that statement alarming too :)
[0:07] <shawniverson> I mean I used --image-shared and yes, I am using vmfs5
[0:07] <TheSov2> u will get corruption, no exceptions
[0:07] <TheSov2> wait, vmware doesnt have a ceph client
[0:07] <TheSov2> wtf are u doing
[0:07] <janos> iscis/multiplath
[0:07] <janos> *iscsi
[0:08] <janos> sharing out an rbd via iscsi
[0:08] <TheSov2> there is currently no funcitonal active/active multipath
[0:09] <shawniverson> path is fixed, unless a failure occurs
[0:09] <shawniverson> then it is supposed to switch over
[0:09] <TheSov2> are you using corosync to keep the reservations active?
[0:12] <shawniverson> no, perhaps that is my problem. was using corosync when trying drbd
[0:12] <TheSov2> you need a reservation system
[0:12] <TheSov2> iscsi sucks that way
[0:12] <TheSov2> the storage layer has no idea what a reservation is, so the iscsi sub system does it
[0:13] <TheSov2> if you dont share it, you will also get corruption
[0:13] <TheSov2> when you switch
[0:13] <shawniverson> makes sense
[0:14] * i_m (~ivan.miro@nat-5-carp.hcn-strela.ru) Quit (Quit: Leaving.)
[0:16] <shawniverson> anyway, really impressed with ceph so far, seems far more mature, feature rich, and scaleable. I'm not looking back.
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[0:36] <TheSov2> shawniverson, for me so far the iscsi thing is a bit upsetting, it really needs an active/active
[0:36] <TheSov2> otherwise the bandwidth just isnt there
[0:36] <TheSov2> but thats more a failure with linux iscsi.
[0:37] <TheSov2> either way, needs a windows client and someone needs to work on esxi
[0:37] <TheSov2> anyway time to go. later
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[22:06] <kszarlej> Hey guys. When ceph stops writing to OSD? What is the percentage of used space?
[22:06] <kszarlej> when ceph decided to stop writing to this osd
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[22:16] <m0zes> kszarlej: iirc 85%
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[22:26] <MACscr> ceph will only use 85% of a disk?
[22:27] <m0zes> MACscr: that is the default threshold. remember, as filesystems fill up, the slow down. potentially exponentially.
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[22:39] <MACscr> i wonder why that is
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[22:40] <MACscr> is it a file system limitation or a hardware issue?
[22:43] <m0zes> generally it is because of the way filesystems are designed. free space fragmentation, allocating additional inodes, finding unused inodes, all take more time as they fill up.
[22:44] <m0zes> some filesystems are worse than others when it comes to this. none behave particularly well over ~95%
[22:45] <kszarlej> m0zes: after 85% it is marked as "near full
[22:45] <kszarlej> where is a full ratio threshold defaulting to 95%
[22:45] <kszarlej> so ceph still stops writing after reaching the near full ratio?
[22:45] <kszarlej> a not the "full ratio"
[22:45] <m0zes> probably not. it probably stops at the full_ratio
[22:46] <kszarlej> oh
[22:46] <kszarlej> so defaulting to 95
[22:46] <m0zes> osd_backfill_full_ratio is .85, so it probably stops backfilling for recovery at 85%, though.
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[22:47] <m0zes> it looks like the osds have a failsafe cap as well. osd_failsafe_full_ratio .97 and osd_failsafe_nearfull_ratio .9
[22:47] <m0zes> in case a client is misbehaving, probably.
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[22:58] <MentalRay> I was wondering how the writes to journal occur when having 3+ copy of files setup
[22:59] <MentalRay> Once the 1st copy has been written from the journal to the OSD
[22:59] <MentalRay> is the 1st journal writes a copy to a second journal which then will write to its osd?
[22:59] <MentalRay> (my guess is yes but I just want to get this confirm)
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