Happy new year to all!
In these holidays i've suffered a disk failure, but hitted also an
'inconsistent pg' error, and i want to understand.
Ceph 12.2.12, filestore.
Starting from 27/12 i get classical disk error:
Dec 27 20:52:21 capitanmarvel kernel: [345907.286795] ata1.00: exception Emask 0x0 SAct 0xfe00000 SErr 0x0 action 0x0
Dec 27 20:52:21 capitanmarvel kernel: [345907.286849] ata1.00: irq_stat 0x40000008
Dec 27 20:52:21 capitanmarvel kernel: [345907.286880] ata1.00: failed command: READ FPDMA QUEUED
Dec 27 20:52:21 capitanmarvel kernel: [345907.286920] ata1.00: cmd 60/00:a8:20:87:3b/04:00:00:00:00/40 tag 21 ncq dma 524288 in
Dec 27 20:52:21 capitanmarvel kernel: [345907.286920] res 41/40:00:46:8a:3b/00:00:00:00:00/40 Emask 0x409 (media error) <F>
Dec 27 20:52:21 capitanmarvel kernel: [345907.287018] ata1.00: status: { DRDY ERR }
Dec 27 20:52:21 capitanmarvel kernel: [345907.287046] ata1.00: error: { UNC }
Dec 27 20:52:21 capitanmarvel kernel: [345907.288676] ata1.00: configured for UDMA/133
Dec 27 20:52:21 capitanmarvel kernel: [345907.288698] sd 1:0:0:0: [sdc] tag#21 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Dec 27 20:52:21 capitanmarvel kernel: [345907.288702] sd 1:0:0:0: [sdc] tag#21 Sense Key : Medium Error [current]
Dec 27 20:52:21 capitanmarvel kernel: [345907.288705] sd 1:0:0:0: [sdc] tag#21 Add. Sense: Unrecovered read error - auto reallocate failed
Dec 27 20:52:21 capitanmarvel kernel: [345907.288708] sd 1:0:0:0: [sdc] tag#21 CDB: Read(10) 28 00 00 3b 87 20 00 04 00 00
Dec 27 20:52:21 capitanmarvel kernel: [345907.288711] print_req_error: I/O error, dev sdc, sector 3902022
but also:
Dec 27 20:52:24 capitanmarvel ceph-osd[3852]: 2019-12-27 20:52:24.714716 7f821fbfd700 -1 log_channel(cluster) log [ERR] : 4.9b missing primary copy of 4:d97871c4:::rbd_data.142b816b8b4567.0000000000012ae1:head, will try copies on 8,14
OSD 'flip-flop' a bit for some days. At first scrub, i got:
cluster:
id: 8794c124-c2ec-4e81-8631-742992159bd6
health: HEALTH_ERR
1 scrub errors
Possible data damage: 1 pg inconsistent
services:
mon: 5 daemons, quorum blackpanther,capitanmarvel,4,2,3
mgr: hulk(active), standbys: blackpanther, deadpool, thor, capitanmarvel
osd: 12 osds: 12 up, 12 in
data:
pools: 3 pools, 768 pgs
objects: 671.04k objects, 2.54TiB
usage: 7.62TiB used, 9.66TiB / 17.3TiB avail
pgs: 766 active+clean
1 active+clean+inconsistent
1 active+clean+scrubbing+deep
finally, OSD die, and so i got (after automatic remapping):
cluster:
id: 8794c124-c2ec-4e81-8631-742992159bd6
health: HEALTH_ERR
1 scrub errors
Possible data damage: 1 pg inconsistent
services:
mon: 5 daemons, quorum blackpanther,capitanmarvel,4,2,3
mgr: hulk(active), standbys: blackpanther, deadpool, thor, capitanmarvel
osd: 12 osds: 11 up, 11 in
data:
pools: 3 pools, 768 pgs
objects: 674.26k objects, 2.55TiB
usage: 7.65TiB used, 8.71TiB / 16.4TiB avail
pgs: 767 active+clean
1 active+clean+inconsistent
To fix the issue i've tried to read the docs (looking for
'OSD_SCRUB_ERRORS'), finding:
https://docs.ceph.com/docs/doc-12.2.0-major-changes/rados/operations/health-checks/
but the link within is empty:
https://docs.ceph.com/docs/doc-12.2.0-major-changes/rados/operations/pg-repair/
and after fiddling a bit with google, i've found:
https://ceph.io/geen-categorie/ceph-manually-repair-object/
that permit me to fix the issue easily with 'ceph pg repair'.
Two question:
1) the missing page on 'pg-repair' is a bug of documentation? There's
something i can do?
2) what happens?
- While, if the OSD was not able to write data to the OSD, they are
not automatically relocated to other OSD? This violate the crushmap?
- while, when the failing OSD get out, the inconsistent PG get not
automatically fixed? I've count=3, the other 2 copies are not
coherent? But, if so, how ceph was able to fix them?
Sorry... and thanks. ;)
--
dott. Marco Gaiarin GNUPG Key ID: 240A3D66
Associazione ``La Nostra Famiglia'' http://www.lanostrafamiglia.it/
Polo FVG - Via della Bontà, 7 - 33078 - San Vito al Tagliamento (PN)
marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 f +39-0434-842797
Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000
(cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)
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