When you get the next inconsistency, can you copy the actual objects from the osd store trees and get them to us? That might provide a clue. -Sam On Fri, Jul 11, 2014 at 6:52 AM, Randy Smith <rbsmith at adams.edu> wrote: > > > > On Thu, Jul 10, 2014 at 4:40 PM, Samuel Just <sam.just at inktank.com> wrote: >> >> It could be an indication of a problem on osd 5, but the timing is >> worrying. Can you attach your ceph.conf? > > > Attached. > >> >> Have there been any osds >> going down, new osds added, anything to cause recovery? > > > I upgraded to firefly last week. As part of the upgrade I, obviously, had to > restart every osd. Also, I attempted to switch to the optimal tunables but > doing so degraded 27% of my cluster and made most of my VMs unresponsive. I > switched back to the legacy tunables and everything was happy again. Both of > those operations, of course, caused recoveries. I have made no changes since > then. > >> >> Anything in >> dmesg to indicate an fs problem? > > > Nothing. The system went inconsistent again this morning, again on the same > rbd but different osds this time. > > 2014-07-11 05:48:12.857657 osd.1 192.168.253.77:6801/12608 904 : [ERR] 3.76 > shard 1: soid 1280076/rb.0.b0ce3.238e1f29.00000000025c/head//3 digest > 2198242284 != known digest 3879754377 > 2014-07-11 05:49:29.020024 osd.1 192.168.253.77:6801/12608 905 : [ERR] 3.76 > deep-scrub 0 missing, 1 inconsistent objects > 2014-07-11 05:49:29.020029 osd.1 192.168.253.77:6801/12608 906 : [ERR] 3.76 > deep-scrub 1 errors > > $ ceph health detail > HEALTH_ERR 1 pgs inconsistent; 1 scrub errors > pg 3.76 is active+clean+inconsistent, acting [1,2] > 1 scrub errors > > >> >> Have you recently changed any >> settings? > > > I upgraded from bobtail to dumpling to firefly. > >> >> -Sam >> >> On Thu, Jul 10, 2014 at 2:58 PM, Randy Smith <rbsmith at adams.edu> wrote: >> > Greetings, >> > >> > Just a follow up on my original issue. =ceph pg repair ...= fixed the >> > problem. However, today I got another inconsistent pg. It's interesting >> > to >> > me that this second error is in the same rbd image and appears to be >> > "close" >> > to the previously inconsistent pg. (Even more fun, osd.5 was the >> > secondary >> > in the first error and is the primary here though the other osd is >> > different.) >> > >> > Is this indicative of a problem on osd.5 or perhaps a clue into what's >> > causing firefly to be so inconsistent? >> > >> > The relevant log entries are below. >> > >> > 2014-07-07 18:50:48.646407 osd.2 192.168.253.70:6801/56987 163 : [ERR] >> > 3.c6 >> > shard 2: soid 34dc35c6/rb.0.b0ce3.238e1f29.00000000000b/head//3 digest >> > 2256074002 != known digest 3998068918 >> > 2014-07-07 18:51:36.936076 osd.2 192.168.253.70:6801/56987 164 : [ERR] >> > 3.c6 >> > deep-scrub 0 missing, 1 inconsistent objects >> > 2014-07-07 18:51:36.936082 osd.2 192.168.253.70:6801/56987 165 : [ERR] >> > 3.c6 >> > deep-scrub 1 errors >> > >> > >> > 2014-07-10 15:38:53.990328 osd.5 192.168.253.81:6800/10013 257 : [ERR] >> > 3.41 >> > shard 1: soid e183cc41/rb.0.b0ce3.238e1f29.00000000024c/head//3 digest >> > 3224286363 != known digest 3409342281 >> > 2014-07-10 15:39:11.701276 osd.5 192.168.253.81:6800/10013 258 : [ERR] >> > 3.41 >> > deep-scrub 0 missing, 1 inconsistent objects >> > 2014-07-10 15:39:11.701281 osd.5 192.168.253.81:6800/10013 259 : [ERR] >> > 3.41 >> > deep-scrub 1 errors >> > >> > >> > >> > On Thu, Jul 10, 2014 at 12:05 PM, Chahal, Sudip <sudip.chahal at intel.com> >> > wrote: >> >> >> >> Thanks - so it appears that the advantage of the 3rd replica (relative >> >> to >> >> 2 replicas) has to do much more with recovering from two concurrent OSD >> >> failures than with inconsistencies found during deep scrub - would you >> >> agree? >> >> >> >> Re: repair - do you mean the "repair" process during deep scrub - if >> >> yes, >> >> this is automatic - correct? >> >> Or >> >> Are you referring to the explicit manually initiated repair commands? >> >> >> >> Thanks, >> >> >> >> -Sudip >> >> >> >> -----Original Message----- >> >> From: Samuel Just [mailto:sam.just at inktank.com] >> >> Sent: Thursday, July 10, 2014 10:50 AM >> >> To: Chahal, Sudip >> >> Cc: Christian Eichelmann; ceph-users at lists.ceph.com >> >> Subject: Re: [ceph-users] scrub error on firefly >> >> >> >> Repair I think will tend to choose the copy with the lowest osd number >> >> which is not obviously corrupted. Even with three replicas, it does >> >> not do >> >> any kind of voting at this time. >> >> -Sam >> >> >> >> On Thu, Jul 10, 2014 at 10:39 AM, Chahal, Sudip >> >> <sudip.chahal at intel.com> >> >> wrote: >> >> > I've a basic related question re: Firefly operation - would >> >> > appreciate >> >> > any insights: >> >> > >> >> > With three replicas, if checksum inconsistencies across replicas are >> >> > found during deep-scrub then: >> >> > a. does the majority win or is the primary always the winner >> >> > and used to overwrite the secondaries >> >> > b. is this reconciliation done automatically during >> >> > deep-scrub or does each reconciliation have to be executed manually >> >> > by the >> >> > administrator? >> >> > >> >> > With 2 replicas - how are things different (if at all): >> >> > a. The primary is declared the winner - correct? >> >> > b. is this reconciliation done automatically during >> >> > deep-scrub or does it have to be done "manually" because there is no >> >> > majority? >> >> > >> >> > Thanks, >> >> > >> >> > -Sudip >> >> > >> >> > >> >> > -----Original Message----- >> >> > From: ceph-users [mailto:ceph-users-bounces at lists.ceph.com] On Behalf >> >> > Of Samuel Just >> >> > Sent: Thursday, July 10, 2014 10:16 AM >> >> > To: Christian Eichelmann >> >> > Cc: ceph-users at lists.ceph.com >> >> > Subject: Re: [ceph-users] scrub error on firefly >> >> > >> >> > Can you attach your ceph.conf for your osds? >> >> > -Sam >> >> > >> >> > On Thu, Jul 10, 2014 at 8:01 AM, Christian Eichelmann >> >> > <christian.eichelmann at 1und1.de> wrote: >> >> >> I can also confirm that after upgrading to firefly both of our >> >> >> clusters (test and live) were going from 0 scrub errors each for >> >> >> about >> >> >> 6 Month to about 9-12 per week... >> >> >> This also makes me kind of nervous, since as far as I know >> >> >> everything >> >> >> "ceph pg repair" does, is to copy the primary object to all >> >> >> replicas, >> >> >> no matter which object is the correct one. >> >> >> Of course the described method of manual checking works (for pools >> >> >> with more than 2 replicas), but doing this in a large cluster nearly >> >> >> every week is horribly timeconsuming and error prone. >> >> >> It would be great to get an explanation for the increased numbers of >> >> >> scrub errors since firefly. Were they just not detected correctly in >> >> >> previous versions? Or is there maybe something wrong with the new >> >> >> code? >> >> >> >> >> >> Acutally, our company is currently preventing our projects to move >> >> >> to >> >> >> ceph because of this problem. >> >> >> >> >> >> Regards, >> >> >> Christian >> >> >> ________________________________ >> >> >> Von: ceph-users [ceph-users-bounces at lists.ceph.com]" im Auftrag von >> >> >> "Travis Rhoden [trhoden at gmail.com] >> >> >> Gesendet: Donnerstag, 10. Juli 2014 16:24 >> >> >> An: Gregory Farnum >> >> >> Cc: ceph-users at lists.ceph.com >> >> >> Betreff: Re: [ceph-users] scrub error on firefly >> >> >> >> >> >> And actually just to follow-up, it does seem like there are some >> >> >> additional smarts beyond just using the primary to overwrite the >> >> >> secondaries... Since I captured md5 sums before and after the >> >> >> repair, I can say that in this particular instance, the secondary >> >> >> copy >> >> >> was used to overwrite the primary. >> >> >> So, I'm just trusting Ceph to the right thing, and so far it seems >> >> >> to, but the comments here about needing to determine the correct >> >> >> object and place it on the primary PG make me wonder if I've been >> >> >> missing something. >> >> >> >> >> >> - Travis >> >> >> >> >> >> >> >> >> On Thu, Jul 10, 2014 at 10:19 AM, Travis Rhoden <trhoden at gmail.com> >> >> >> wrote: >> >> >>> >> >> >>> I can also say that after a recent upgrade to Firefly, I have >> >> >>> experienced massive uptick in scrub errors. The cluster was on >> >> >>> cuttlefish for about a year, and had maybe one or two scrub errors. >> >> >>> After upgrading to Firefly, we've probably seen 3 to 4 dozen in the >> >> >>> last month or so (was getting 2-3 a day for a few weeks until the >> >> >>> whole cluster was rescrubbed, it seemed). >> >> >>> >> >> >>> What I cannot determine, however, is how to know which object is >> >> >>> busted? >> >> >>> For example, just today I ran into a scrub error. The object has >> >> >>> two copies and is an 8MB piece of an RBD, and has identical >> >> >>> timestamps, identical xattrs names and values. But it definitely >> >> >>> has a different >> >> >>> MD5 sum. How to know which one is correct? >> >> >>> >> >> >>> I've been just kicking off pg repair each time, which seems to just >> >> >>> use the primary copy to overwrite the others. Haven't run into any >> >> >>> issues with that so far, but it does make me nervous. >> >> >>> >> >> >>> - Travis >> >> >>> >> >> >>> >> >> >>> On Tue, Jul 8, 2014 at 1:06 AM, Gregory Farnum <greg at inktank.com> >> >> >>> wrote: >> >> >>>> >> >> >>>> It's not very intuitive or easy to look at right now (there are >> >> >>>> plans from the recent developer summit to improve things), but the >> >> >>>> central log should have output about exactly what objects are >> >> >>>> busted. You'll then want to compare the copies manually to >> >> >>>> determine which ones are good or bad, get the good copy on the >> >> >>>> primary (make sure you preserve xattrs), and run repair. >> >> >>>> -Greg >> >> >>>> Software Engineer #42 @ http://inktank.com | http://ceph.com >> >> >>>> >> >> >>>> >> >> >>>> On Mon, Jul 7, 2014 at 6:48 PM, Randy Smith <rbsmith at adams.edu> >> >> >>>> wrote: >> >> >>>> > Greetings, >> >> >>>> > >> >> >>>> > I upgraded to firefly last week and I suddenly received this >> >> >>>> > error: >> >> >>>> > >> >> >>>> > health HEALTH_ERR 1 pgs inconsistent; 1 scrub errors >> >> >>>> > >> >> >>>> > ceph health detail shows the following: >> >> >>>> > >> >> >>>> > HEALTH_ERR 1 pgs inconsistent; 1 scrub errors pg 3.c6 is >> >> >>>> > active+clean+inconsistent, acting [2,5] >> >> >>>> > 1 scrub errors >> >> >>>> > >> >> >>>> > The docs say that I can run `ceph pg repair 3.c6` to fix this. >> >> >>>> > What I want to know is what are the risks of data loss if I run >> >> >>>> > that command in this state and how can I mitigate them? >> >> >>>> > >> >> >>>> > -- >> >> >>>> > Randall Smith >> >> >>>> > Computing Services >> >> >>>> > Adams State University >> >> >>>> > http://www.adams.edu/ >> >> >>>> > 719-587-7741 >> >> >>>> > >> >> >>>> > _______________________________________________ >> >> >>>> > ceph-users mailing list >> >> >>>> > ceph-users at lists.ceph.com >> >> >>>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >>>> > >> >> >>>> _______________________________________________ >> >> >>>> ceph-users mailing list >> >> >>>> ceph-users at lists.ceph.com >> >> >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >>> >> >> >>> >> >> >> >> >> >> >> >> >> _______________________________________________ >> >> >> ceph-users mailing list >> >> >> ceph-users at lists.ceph.com >> >> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> >> >> > _______________________________________________ >> >> > ceph-users mailing list >> >> > ceph-users at lists.ceph.com >> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> _______________________________________________ >> >> ceph-users mailing list >> >> ceph-users at lists.ceph.com >> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > >> > >> > >> > >> > -- >> > Randall Smith >> > Computing Services >> > Adams State University >> > http://www.adams.edu/ >> > 719-587-7741 >> > >> > _______________________________________________ >> > ceph-users mailing list >> > ceph-users at lists.ceph.com >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > > > > > -- > Randall Smith > Computing Services > Adams State University > http://www.adams.edu/ > 719-587-7741
 |