Hello Juan, No, I haven't seen the problem you describe. Our testing configuration has only a single target per server - each MDS has a single MDT, and each OSS has a single OST.
We've encountered some issues, but so far stability has been good. Our testing has been on relatively small scale, though. Olaf P. Faaland Livermore Computing ________________________________________ From: Juan PC [[email protected]] Sent: Monday, May 09, 2016 4:25 AM To: Faaland, Olaf P.; [email protected] Subject: Re: [lustre-discuss] default directory striping with Lustre 2.8 Dear Olaf, I would like to hear about your experience with stripped directories in Lustre 2.8. Mine is that this feature is still unstable and a lot of "BUG: soft lockup..." errors start appearing. Maybe the problem is the setup that I use: as many OSTs as MDTs, with a pair OST-MDT per server. Have you faced the same problem? Regards, Juan El 05/05/16 a las 01:04, Faaland, Olaf P. escribió: > Hi, > > Suppose you have m MDTs in your filesystem, and create a new directory > and set default directory striping using > > lfs mkdir --count=c --index=k <path> && lfs setdirstripe --default > --count=c <path> > > Suppose that c < m and m > 2. > > Then you make subdirectories, like > > mkdir <path>/child.{1,2,3,...} > > a) By design, do the child directories have the same starting index as > <path>? > b) By design, are the child directories all striped across the same set > of MDTs as <path>? > > I didn't see that specified one way or the other in the DNE phase 2 high > level design document at > http://wiki.opensfs.org/DNE_StripedDirectories_HighLevelDesign_wiki_version. > If I should look elsewhere, let me know. > > In a test I was doing today, I noticed that neither (a) nor (b) were > true in practice. I'm wondering whether that's a bug or a feature. > Here's partial output from my test. > > $ lfs mkdir --count=6 --index=2 /p/lustre/faaland1/count6_index2 > $ lfs setdirstripe -D --count=6 /p/lustre/faaland1/count6_index2 > $ mkdir > /p/lustre/faaland1/count6_index2/subdir.{1,2,3,4,5,6,7,8,9,10,11,12,13,14} > $ lfs getdirstripe /p/lustre/faaland1/count6_index2 > /p/lustre/faaland1/count6_index2 > lmv_stripe_count: 6 lmv_stripe_offset: 2 > mdtidx FID[seq:oid:ver] > 2 [0x280000400:0x33f3:0x0] > 3 [0x2c0000404:0x33f3:0x0] > 4 [0x300000402:0x33f2:0x0] > 5 [0x340000407:0x33f1:0x0] > 6 [0x380000406:0x33f0:0x0] > 7 [0x3c0000404:0x33ef:0x0] > /p/lustre/faaland1/count6_index2/subdir.4 > lmv_stripe_count: 6 lmv_stripe_offset: 2 > mdtidx FID[seq:oid:ver] > 2 [0x280000400:0x33f5:0x0] > 3 [0x2c0000404:0x33f5:0x0] > 4 [0x300000402:0x33f4:0x0] > 5 [0x340000407:0x33f3:0x0] > 6 [0x380000406:0x33f2:0x0] > 7 [0x3c0000404:0x33f1:0x0] > /p/lustre/faaland1/count6_index2/subdir.9 > lmv_stripe_count: 6 lmv_stripe_offset: 5 > mdtidx FID[seq:oid:ver] > 5 [0x340000400:0x37a1:0x0] > 6 [0x380000405:0x37a1:0x0] > 7 [0x3c0000402:0x37a0:0x0] > 8 [0x40000040e:0x379f:0x0] > 9 [0x440000403:0x379e:0x0] > 0 [0x200000405:0x379d:0x0] > /p/lustre/faaland1/count6_index2/subdir.3 > lmv_stripe_count: 6 lmv_stripe_offset: 5 > mdtidx FID[seq:oid:ver] > 5 [0x340000400:0x37a0:0x0] > 6 [0x380000405:0x37a0:0x0] > 7 [0x3c0000402:0x379f:0x0] > 8 [0x40000040e:0x379e:0x0] > 9 [0x440000403:0x379d:0x0] > 0 [0x200000405:0x379c:0x0] > /p/lustre/faaland1/count6_index2/subdir.14 > lmv_stripe_count: 6 lmv_stripe_offset: 7 > mdtidx FID[seq:oid:ver] > 7 [0x3c0000400:0x30d4:0x0] > 8 [0x400000403:0x30d4:0x0] > 9 [0x440000405:0x30d3:0x0] > 0 [0x200000407:0x30d2:0x0] > 1 [0x240000407:0x30d1:0x0] > 2 [0x280000407:0x30d0:0x0] > ... > > > Olaf P. Faaland > Livermore Computing > phone : 925-422-2263 > > > _______________________________________________ > lustre-discuss mailing list > [email protected] > http://secure-web.cisco.com/1b6O1t0NM65SMDLd0VNnGkO8_2o0mWu7q_SotZhqVF-Z73mleDDzd45s2PwtZKJUD3Ztk-yckmuoGMq16E0Fw-LUq6hUtZjrPDpumyab9NGBeDZW21yP4CD9mliUhSCZwbhRAGnVnx6TJbxY-lfFJNAdY6Pdfv1hIx4bNQDu5cYl-aIXJWj15Y_Lum0LphN60mITae7Uf-w6xbGKd5g1bEyUK5SHoQ-NIJdGLF215kUypB_BB-96iWRj3tsoPdUp_ClSF7fBDItzoBV5jgOeHam7Ne6ztUVj7zqKJ8wQEEwJAC9CV_u7N7rLrxVaOVuFO2drWjpFe8tnmgn8tlPCjaH8Q4Y85Unr_I3dcOI4xZyo/http%3A%2F%2Flists.lustre.org%2Flistinfo.cgi%2Flustre-discuss-lustre.org > -- D. Juan Piernas Cánovas Departamento de Ingeniería y Tecnología de Computadores Facultad de Informática. Universidad de Murcia Campus de Espinardo - 30080 Murcia (SPAIN) Tel.: +34868887657 Fax: +34868884151 email: [email protected] PGP public key: http://pgp.rediris.es:11371/pks/lookup?search=piernas%40ditec.um.es&op=index *** Por favor, envíeme sus documentos en formato texto, HTML, PDF o PostScript :-) *** _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
