#ceph IRC Log

Index

IRC Log for 2014-07-05

Timestamps are in GMT/BST.

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[8:31] <danm> hi there
[8:32] <danm> anyone know if it would be a particularly bad idea to have you radosgw and cloudstack ms on the same server?
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[12:39] <mozg> hello guys
[12:39] <mozg> anyone online?
[12:39] <mozg> I was wondering if anyone had issues upgrading from Emperor to Firefly?
[12:40] <mozg> or any tips on the upgrade process?
[12:40] <mozg> I am about to do the upgrade
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[13:23] <tnt_> mozg: I had a few issues.
[13:23] <tnt_> 1) Make sure you upgrade the leader mon first
[13:24] <tnt_> 2) Make sure you have enough RAM. I had a 25-30% increase in RAM usage for each OSD process. (which depending on how many process you have and how big can mean several Gig ...).
[13:25] <tnt_> 3) Make sure you haven't modified /etc/ceph/rbdmap and it's still the original from the install (at least on debian/ubuntu having modiied this file will screw up the update).
[13:27] <tnt_> Oh yeah, and if you use radosgw, multi-part upload will be broken. I use a custom built package for it because the fix is not in the latest released package.
[13:29] <mozg> and tnt_: thanks
[13:29] <mozg> i've just done the upgrade
[13:29] <mozg> it went okay, no issues during the upgrade process
[13:29] <mozg> however, I am having some trouble with guest vm io wait while the data is being reshuffled
[13:30] <mozg> following the crush map change to optimal
[13:30] <mozg> is there a way either to speed up the recovery
[13:30] <mozg> or to lower the recovery priority so that guest vms are more responsive?
[13:30] <mozg> I am having over 70% iowait on the guest vms
[13:30] <mozg> and lods of hanged tasks
[13:30] <tnt_> No idea, haven't done that yet. I left this for next week, I want to simulate the data movements first to see how much data will be shuffled.
[13:31] <mozg> my cluster is shuffling 30% data
[13:31] <mozg> which is a great deal !
[13:31] <mozg> and it's not doing it fast
[13:40] <mozg> anyone have any idea how to speed up data reshuffle?
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[15:11] <mozg> does anyone know how to decrease the number of backfills for the cluster?
[15:12] <mozg> at the moment I've got about 10 active+remapped+backfilling processes
[15:12] <mozg> probably this is too many for the cluster to cope
[15:13] <mozg> I've tried setting "osd_max_backfills": "1",
[15:13] <mozg> but as far as I know this value is per osd
[15:14] <mozg> so if I have 17 osds, the maximum backfils for the cluster would be 17
[15:14] <mozg> is there a way to reduce it even further?
[15:14] <mozg> like leaving 1-2 backfills instead of 10 which I currently have?
[15:14] <mozg> i know this will increase the recovery time
[15:14] <mozg> but at least my vms should become responsive again
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[22:20] <MACscr> mozg: maybe you could try a decimal value?
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[22:51] <Pauline> mozg: tried ceph tell osd.* injectargs '--osd-max-backfills 1' ?
[23:01] <MACscr> Pauline: isnt that what he already said he did?
[23:02] <MACscr> and that value is per osd
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[23:02] <Pauline> MACscr: Not sure in what context he set it. quotes made me think of strings and therefor the conf file.
[23:03] <MACscr> right, but still that is per osd based on the asterisk you used
[23:04] <Pauline> MACscr: hmm. you can be nasty and give all but say 5 osds the value 0, and the other 5, 1 as value :)
[23:04] <MACscr> ha, that doesnt sound like a great idea, but i am a complete noob to ceph
[23:05] <MACscr> so what do i know
[23:06] <Pauline> actually, i think it would work, just remember to add another 5 to the set of "1" osd each time they have finished rebalancing.
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[23:16] <mozg> Pauline: thanks
[23:16] <mozg> i currently have max backfills set to 1
[23:16] <mozg> but the rebalance has just finished
[23:16] <mozg> it took ages (((
[23:16] <mozg> and during that time vms had no io to them
[23:16] <mozg> so they all crashed (((
[23:16] <mozg> big time
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[23:21] <Pauline> hmmz. that's really bad than. My own cluster seems to hold up with max backfills set to 1, and having ssds as journals (6 osd per ssd actually)
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