[Gluster-users] heaps split-brains during back-transfert

Niels de Vos ndevos at redhat.com
Fri Jul 31 09:26:26 UTC 2015


On Wed, Jul 29, 2015 at 12:44:38AM +0200, Geoffrey Letessier wrote:
> OK, thank you Niels for this explanation. Now, this makes sense.
> 
> And concerning all split-brains appeared during the back-transfert, do you have an idea where is this coming from?

Sorry, no, I dont know how that is happening in your environment. I'll
try to find someone that understands more about it and can help you with
that.

Niels

> 
> Best,
> Geoffrey
> ------------------------------------------------------
> Geoffrey Letessier
> Responsable informatique & ingénieur système
> UPR 9080 - CNRS - Laboratoire de Biochimie Théorique
> Institut de Biologie Physico-Chimique
> 13, rue Pierre et Marie Curie - 75005 Paris
> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at ibpc.fr
> 
> Le 29 juil. 2015 à 00:02, Niels de Vos <ndevos at redhat.com> a écrit :
> 
> > On Tue, Jul 28, 2015 at 03:46:37PM +0200, Geoffrey Letessier wrote:
> >> Hi,
> >> 
> >> In addition of all split brains reported, is it normal to notice
> >> thousands and thousands (several tens nay hundreds of thousands)
> >> broken symlinks browsing the .glusterfs directory on each brick? 
> > 
> > Yes, I think it is normal. A symlink points to a particular filename,
> > possibly in a different directory. If the target file is located on a
> > different brick, the symlink points to a non-local file.
> > 
> > Consider this example with two bricks in a distributed volume:
> > - file: README
> > - symlink: IMPORTANT -> README
> > 
> > When the distribution algorithm is done, README 'hashes' to brick-A. The
> > symlink 'hashes' to brick-B. This means that README will be localed on
> > brick-A, and the symlink with name IMPORTANT would be located on
> > brick-B. Because README is not on the same brick as IMPORTANT, the
> > symlink points to the non-existing file README on brick-B.
> > 
> > However, when a Gluster client reads the target of symlink IMPORTANT,
> > the Gluster client calculate the location of README and will know that
> > README can be found on brick-A.
> > 
> > I hope that makes sense?
> > 
> > Niels
> > 
> > 
> >> For the moment, i just synchronized one remote directory (around 30TB
> >> and a few million files) into my new volume. No other operations on
> >> files on this volume has yet been done.
> >> How can I fix it? Can I delete these dead-symlinks? How can I fix all
> >> my split-brains? 
> >> 
> >> Here is an example of a ls:
> >> [root at cl-storage3 ~]# cd /export/brick_home/brick1/data/.glusterfs/7b/d2/
> >> [root at cl-storage3 d2]# ll
> >> total 8,7M
> >>     13706 drwx------   2 root      root            8,0K 26 juil. 17:22 .
> >> 2147483784 drwx------ 258 root      root            8,0K 20 juil. 23:07 ..
> >> 2148444137 -rwxrwxrwx   2 baaden    baaden_team     173K 22 mai    2008 7bd200dd-1774-4395-9065-605ae30ec18b
> >>   1559384 -rw-rw-r--   2 tarus     amyloid_team    4,3K 19 juin   2013 7bd2155c-7a05-4edc-ae77-35ed7e16afbc
> >>    287295 lrwxrwxrwx   1 root      root              58 20 juil. 23:38 7bd2370a-100b-411e-89a4-d184da9f0f88 -> ../../a7/59/a759de6f-cdf5-43dd-809a-baf81d103bf7/prop-base
> >> 2149090201 -rw-rw-r--   2 tarus     amyloid_team     76K  8 mars   2014 7bd2497f-d24b-4b19-a1c5-80a4956e56a1
> >> 2148561174 -rw-r--r--   2 tran      derreumaux_team  575 14 févr. 07:54 7bd25db0-67f5-43e5-a56a-52cf8c4c60dd
> >>   1303943 -rw-r--r--   2 tran      derreumaux_team  576 10 févr. 06:06 7bd25e97-18be-4faf-b122-5868582b4fd8
> >>   1308607 -rw-r--r--   2 tran      derreumaux_team 414K 16 juin  11:05 7bd2618f-950a-4365-a753-723597ef29f5
> >>     45745 -rw-r--r--   2 letessier admin_team       585  5 janv.  2012 7bd265c7-e204-4ee8-8717-e4a0c393fb0f
> >> 2148144918 -rw-rw-r--   2 tarus     amyloid_team    107K 28 févr.  2014 7bd26c5b-d48a-481a-9ca6-2dc27768b5ad
> >>     13705 -rw-rw-r--   2 tarus     amyloid_team     25K  4 juin   2014 7bd27e4c-46ba-4f21-a766-389bfa52fd78
> >>   1633627 -rw-rw-r--   2 tarus     amyloid_team     75K 12 mars   2014 7bd28631-90af-4c16-8ff0-c3d46d5026c6
> >>   1329165 -rw-r--r--   2 tran      derreumaux_team  175 15 juin  23:40 7bd2957e-a239-4110-b3d8-b4926c7f060b
> >>    797803 lrwxrwxrwx   2 baaden    baaden_team       26  2 avril  2007 7bd29933-1c80-4c6b-ae48-e64e4da874cb -> ../divided/a7/2a7o.pdb1.gz
> >>   1532463 -rw-rw-rw-   2 baaden    baaden_team     1,8M  2 nov.   2009 7bd29d70-aeb4-4eca-ac55-fae2d46ba911
> >>   1411112 -rw-r--r--   2 sterpone  sterpone_team   3,1K  2 mai    2012 7bd2a5eb-62a4-47fc-b149-31e10bd3c33d
> >> 2148865896 -rw-r--r--   2 tran      derreumaux_team 2,1M 15 juin  23:46 7bd2ae9c-18ca-471f-a54a-6e4aec5aea89
> >> 2148762578 -rw-rw-r--   2 tarus     amyloid_team    154K 11 mars   2014 7bd2b7d7-7745-4842-b7b4-400791c1d149
> >>    149216 -rw-r--r--   2 vamparys  sacquin_team    241K 17 mai    2013 7bd2ba98-6a42-40ea-87ea-acb607d73cb5
> >> 2148977923 -rwxr-xr-x   2 murail    baaden_team      23K 18 juin   2012 7bd2cf57-19e7-451c-885d-fd02fd988d43
> >>   1176623 -rw-rw-r--   2 tarus     amyloid_team    227K  8 mars   2014 7bd2d92c-7ec8-4af8-9043-49d1908a99dc
> >>   1172122 lrwxrwxrwx   2 sterpone  sterpone_team     61 17 avril 12:49 7bd2d96e-e925-45f0-a26a-56b95c084122 -> ../../../../../src/libs/ck-libs/ParFUM-Tops-Dev/ParFUM_TOPS.h
> >>   1385933 -rw-r--r--   2 tran      derreumaux_team 2,9M 16 juin  05:29 7bd2df54-17d2-4644-96b7-f8925a67ec1e
> >>    745899 lrwxrwxrwx   1 root      root              58 22 juil. 09:50 7bd2df83-ce58-4a17-aca8-a32b71e953d4 -> ../../5c/39/5c39010f-fa77-49df-8df6-8d72cf74fd64/model_009
> >> 2149100186 -rw-rw-r--   2 tarus     amyloid_team    494K 17 mars   2014 7bd2e865-a2f4-4d90-ab29-dccebe2e3440
> >> 
> >> 
> >> 
> >> Best.
> >> Geoffrey
> >> ------------------------------------------------------
> >> Geoffrey Letessier
> >> Responsable informatique & ingénieur système
> >> UPR 9080 - CNRS - Laboratoire de Biochimie Théorique
> >> Institut de Biologie Physico-Chimique
> >> 13, rue Pierre et Marie Curie - 75005 Paris
> >> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at ibpc.fr
> >> 
> >> Le 27 juil. 2015 à 22:57, Geoffrey Letessier <geoffrey.letessier at cnrs.fr> a écrit :
> >> 
> >>> Dears,
> >>> 
> >>> For a couple of weeks (more than one month), our computing production is stopped due to several -but amazing- troubles with GlusterFS. 
> >>> 
> >>> After having noticed a big problem with incorrect quota size accounted for many many files, i decided under the guidance of Gluster team support to upgrade my storage cluster from version 3.5.3 to the latest (3.7.2-3) because these bugs are theoretically fixed in this branch. Now, since i’ve done this upgrade, it’s the amazing mess and i cannot restart the production.
> >>> Indeed :
> >>> 	1 - RDMA protocol is not working and hang my system / shell commands; only TCP protocol (over Infiniband) is more or less operational   - it’s not a blocking point but… 
> >>> 	2 - read/write performance relatively low
> >>> 	3 - thousands split-brains are appeared.
> >>> 
> >>> So, for the moment, i believe GlusterFS 3.7 is not actually production ready. 
> >>> 
> >>> Concerning the third point: after having destroy all my volumes (RAID re-init, new partition, GlusterFS volumes, etc.), recreate the main one, I tried to back-transfert my data from archive/backup server info this new volume and I note a lot of errors in my mount log file, as your can read in this extract:
> >>> [2015-07-26 22:35:16.962815] I [afr-self-heal-entry.c:565:afr_selfheal_entry_do] 0-vol_home-replicate-0: performing entry selfheal on 865083fa-984e-44bd-aacf-b8195789d9e0
> >>> [2015-07-26 22:35:16.965896] E [afr-self-heal-entry.c:249:afr_selfheal_detect_gfid_and_type_mismatch] 0-vol_home-replicate-0: Gfid mismatch detected for <865083fa-984e-44bd-aacf-b8195789d9e0/job.pbs>, e944d444-66c5-40a4-9603-7c190ad86013 on vol_home-client-1 and 820f9bcc-a0f6-40e0-bcec-28a76b4195ea on vol_home-client-0. Skipping conservative merge on the file.
> >>> [2015-07-26 22:35:16.975206] I [afr-self-heal-entry.c:565:afr_selfheal_entry_do] 0-vol_home-replicate-0: performing entry selfheal on 29382d8d-c507-4d2e-b74d-dbdcb791ca65
> >>> [2015-07-26 22:35:28.719935] E [afr-self-heal-entry.c:249:afr_selfheal_detect_gfid_and_type_mismatch] 0-vol_home-replicate-0: Gfid mismatch detected for <29382d8d-c507-4d2e-b74d-dbdcb791ca65/res_1BVK_r_u_1IBR_l_u_Cond.1IBR_l_u.1BVK_r_u.UB.global.dat.txt>, 951c5ffb-ca38-4630-93f3-8e4119ab0bd8 on vol_home-client-1 and 5ae663ca-e896-4b92-8ec5-5b15422ab861 on vol_home-client-0. Skipping conservative merge on the file.
> >>> [2015-07-26 22:35:29.764891] I [afr-self-heal-entry.c:565:afr_selfheal_entry_do] 0-vol_home-replicate-0: performing entry selfheal on 865083fa-984e-44bd-aacf-b8195789d9e0
> >>> [2015-07-26 22:35:29.768339] E [afr-self-heal-entry.c:249:afr_selfheal_detect_gfid_and_type_mismatch] 0-vol_home-replicate-0: Gfid mismatch detected for <865083fa-984e-44bd-aacf-b8195789d9e0/job.pbs>, e944d444-66c5-40a4-9603-7c190ad86013 on vol_home-client-1 and 820f9bcc-a0f6-40e0-bcec-28a76b4195ea on vol_home-client-0. Skipping conservative merge on the file.
> >>> [2015-07-26 22:35:29.775037] I [afr-self-heal-entry.c:565:afr_selfheal_entry_do] 0-vol_home-replicate-0: performing entry selfheal on 29382d8d-c507-4d2e-b74d-dbdcb791ca65
> >>> [2015-07-26 22:35:29.776857] E [afr-self-heal-entry.c:249:afr_selfheal_detect_gfid_and_type_mismatch] 0-vol_home-replicate-0: Gfid mismatch detected for <29382d8d-c507-4d2e-b74d-dbdcb791ca65/res_1BVK_r_u_1IBR_l_u_Cond.1IBR_l_u.1BVK_r_u.UB.global.dat.txt>, 951c5ffb-ca38-4630-93f3-8e4119ab0bd8 on vol_home-client-1 and 5ae663ca-e896-4b92-8ec5-5b15422ab861 on vol_home-client-0. Skipping conservative merge on the file.
> >>> [2015-07-26 22:35:29.800535] W [MSGID: 108008] [afr-self-heal-name.c:353:afr_selfheal_name_gfid_mismatch_check] 0-vol_home-replicate-0: GFID mismatch for <gfid:29382d8d-c507-4d2e-b74d-dbdcb791ca65>/res_1BVK_r_u_1IBR_l_u_Cond.1IBR_l_u.1BVK_r_u.UB.global.dat.txt 951c5ffb-ca38-4630-93f3-8e4119ab0bd8 on vol_home-client-1 and 5ae663ca-e896-4b92-8ec5-5b15422ab861 on vol_home-client-0
> >>> 
> >>> And when I try to browse some folders (still in mount log file):
> >>> [2015-07-27 09:00:19.005763] I [afr-self-heal-entry.c:565:afr_selfheal_entry_do] 0-vol_home-replicate-0: performing entry selfheal on 2ac27442-8be0-4985-b48f-3328a86a6686
> >>> [2015-07-27 09:00:22.322316] E [afr-self-heal-entry.c:249:afr_selfheal_detect_gfid_and_type_mismatch] 0-vol_home-replicate-0: Gfid mismatch detected for <2ac27442-8be0-4985-b48f-3328a86a6686/md0012588.gro>, 9c635868-054b-4a13-b974-0ba562991586 on vol_home-client-1 and 1943175c-b336-4b33-aa1c-74a1c51f17b9 on vol_home-client-0. Skipping conservative merge on the file.
> >>> [2015-07-27 09:00:23.008771] I [afr-self-heal-entry.c:565:afr_selfheal_entry_do] 0-vol_home-replicate-0: performing entry selfheal on 2ac27442-8be0-4985-b48f-3328a86a6686
> >>> [2015-07-27 08:59:50.359187] W [MSGID: 108008] [afr-self-heal-name.c:353:afr_selfheal_name_gfid_mismatch_check] 0-vol_home-replicate-0: GFID mismatch for <gfid:2ac27442-8be0-4985-b48f-3328a86a6686>/md0012588.gro 9c635868-054b-4a13-b974-0ba562991586 on vol_home-client-1 and 1943175c-b336-4b33-aa1c-74a1c51f17b9 on vol_home-client-0
> >>> [2015-07-27 09:00:02.500419] W [MSGID: 108008] [afr-self-heal-name.c:353:afr_selfheal_name_gfid_mismatch_check] 0-vol_home-replicate-0: GFID mismatch for <gfid:2ac27442-8be0-4985-b48f-3328a86a6686>/md0012590.gro b22aec09-2be3-41ea-a976-7b8d0e6f61f0 on vol_home-client-1 and ec100f9e-ec48-4b29-b75e-a50ec6245de6 on vol_home-client-0
> >>> [2015-07-27 09:00:02.506925] W [MSGID: 108008] [afr-self-heal-name.c:353:afr_selfheal_name_gfid_mismatch_check] 0-vol_home-replicate-0: GFID mismatch for <gfid:2ac27442-8be0-4985-b48f-3328a86a6686>/md0009059.gro 0485c093-11ca-4829-b705-e259668ebd8c on vol_home-client-1 and e83a492b-7f8c-4b32-a76e-343f984142fe on vol_home-client-0
> >>> [2015-07-27 09:00:23.001121] W [MSGID: 108008] [afr-read-txn.c:241:afr_read_txn] 0-vol_home-replicate-0: Unreadable subvolume -1 found with event generation 2. (Possible split-brain)
> >>> [2015-07-27 09:00:26.231262] E [afr-self-heal-entry.c:249:afr_selfheal_detect_gfid_and_type_mismatch] 0-vol_home-replicate-0: Gfid mismatch detected for <2ac27442-8be0-4985-b48f-3328a86a6686/md0012588.gro>, 9c635868-054b-4a13-b974-0ba562991586 on vol_home-client-1 and 1943175c-b336-4b33-aa1c-74a1c51f17b9 on vol_home-client-0. Skipping conservative merge on the file.
> >>> 
> >>> And, above all, browsing folder I get a lot of input/ouput errors.
> >>> 
> >>> Currently I have 6.2M inodes and roughly 30TB in my "new" volume.
> >>> 
> >>> For the moment, Quota is disable to increase the IO performance during the back-transfert… 
> >>> 
> >>> Your can also find in attachments:
> >>> 	- an "ls" result
> >>> 	- a split-brain research result
> >>> 	- the volume information and status
> >>> 	- a complete volume heal info
> >>> 
> >>> Hoping this can help your to help me to fix all my problems and reopen the computing production.
> >>> 
> >>> Thanks in advance,
> >>> Geoffrey
> >>> 
> >>> PS: « Erreur d’Entrée/Sortie » = « Input / Output Error » 
> >>> ------------------------------------------------------
> >>> Geoffrey Letessier
> >>> Responsable informatique & ingénieur système
> >>> UPR 9080 - CNRS - Laboratoire de Biochimie Théorique
> >>> Institut de Biologie Physico-Chimique
> >>> 13, rue Pierre et Marie Curie - 75005 Paris
> >>> Tel: 01 58 41 50 93 - eMail: geoffrey.letessier at ibpc.fr
> >>> 
> >>> <ls_example.txt>
> >>> <split_brain__20150725.txt>
> >>> <vol_home_healinfo.txt>
> >>> <vol_home_info.txt>
> >>> <vol_home_status.txt>
> >> 
> 


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