Hi, I made LVM RAID10 from 8 HDDs with size 8T on CentOS 7 server. # lvs -a -o name,segtype,devices LV Type Devicesdata raid10 data_rimage_0(0),data_rimage_1(0),data_rimage_2(0),data_rimage_3(0),data_rimage_4(0),data_rimage_5(0),data_rimage_6(0),data_rimage_7(0)
[data_rimage_0] linear /dev/sda(1) [data_rimage_1] linear /dev/sdb(1) [data_rimage_2] linear /dev/sdc(1) [data_rimage_3] linear /dev/sde(1) [data_rimage_4] linear /dev/sdf(1) [data_rimage_5] linear /dev/sdg(1) [data_rimage_6] linear /dev/sdk(1) [data_rimage_7] linear /dev/sdl(1) [data_rmeta_0] linear /dev/sda(0) [data_rmeta_1] linear /dev/sdb(0) [data_rmeta_2] linear /dev/sdc(0) [data_rmeta_3] linear /dev/sde(0) [data_rmeta_4] linear /dev/sdf(0) [data_rmeta_5] linear /dev/sdg(0) [data_rmeta_6] linear /dev/sdk(0) [data_rmeta_7] linear /dev/sdl(0) # rpm -qa | grep lvm2 lvm2-2.02.180-10.el7_6.3.x86_64 lvm2-libs-2.02.180-10.el7_6.3.x86_64 Use XFS with external logdev. # xfs_info /datameta-data=/dev/mapper/vg_data-data isize=512 agcount=32, agsize=219769456 blks
= sectsz=4096 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=7032622592, imaxpct=5 = sunit=16 swidth=128 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =external bsize=4096 blocks=262144, version=2= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0But when I try to write ~100Mbit data (video files) to this LV, I see in iostat 100% busy for LV, but HDDs not. It confuses me. This is normal? Or is there really a problem?
Help me please.
Thank you.
# iostat -xk 5 /dev/vg_data/data /dev/sd{a,b,c,e,f,g,k,l}
Linux 3.10.0-957.5.1.el7.x86_64 (streamer) 02.04.2019
_x86_64_ (32 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle 1,40 0,00 0,81 4,20 0,00 93,59Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 46,43 49,70 75,98 28,03 7810,41 4156,71 230,12 1,12 10,73 9,28 14,65 2,83 29,48 sdc 45,32 49,60 75,75 28,49 7726,38 4158,48 228,03 0,77 7,40 9,32 2,28 2,77 28,86 sdb 77,96 112,76 41,87 48,58 7651,46 9504,77 379,35 2,66 29,40 96,08 63,75 4,98 45,05 sdg 69,15 112,11 49,06 49,32 7549,31 9506,47 346,72 2,12 21,60 78,58 55,36 4,48 44,07 sdl 69,30 99,51 52,89 46,86 7799,80 8549,16 327,79 1,53 15,35 64,68 54,86 4,29 42,83 sdf 42,19 49,96 75,11 27,89 7488,68 4157,53 226,13 1,47 14,28 9,55 27,01 2,87 29,61 sde 81,86 112,55 38,41 48,27 7679,43 9452,76 395,29 2,94 33,96 106,24 68,86 5,23 45,30 sdk 50,95 49,86 70,30 27,96 7738,02 4157,36 242,12 1,32 13,47 11,77 17,75 3,03 29,81 dm-16 0,00 0,00 3,54 187,67 153,35 11187,18 118,62 0,72 3,60 91,29 1,94 2,20 42,03
avg-cpu: %user %nice %system %iowait %steal %idle 2,11 0,00 0,77 5,36 0,00 91,76Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 3,40 31,20 1,80 29,80 306,40 2405,60 171,65 2,63 83,38 2,00 88,30 12,80 40,46 sdc 2,80 32,20 1,40 30,80 256,00 2425,60 166,56 4,37 135,65 69,71 138,65 13,55 43,62 sdb 0,80 31,20 0,40 31,40 50,40 2408,80 154,67 4,90 193,65 109,50 194,72 17,18 54,62 sdg 1,20 31,60 0,40 23,80 102,40 2424,00 208,79 1,62 46,68 30,00 46,96 11,68 28,26 sdl 2,00 31,60 1,00 31,60 152,80 2424,00 158,09 2,57 117,57 41,40 119,98 11,43 37,26 sdf 2,20 31,60 2,00 28,20 255,20 2432,80 178,01 1,88 62,09 26,90 64,59 10,46 31,60 sde 0,80 32,00 1,00 26,60 101,60 2416,80 182,49 2,19 61,46 80,40 60,74 15,02 41,46 sdk 2,60 31,60 1,20 30,00 204,00 2420,80 168,26 1,37 43,83 114,00 41,03 9,95 31,04 dm-16 0,00 0,00 25,00 165,00 1428,80 8962,40 109,38 281,67 1771,52 56,13 2031,43 5,26 100,00
avg-cpu: %user %nice %system %iowait %steal %idle 2,22 0,00 0,75 2,73 0,00 94,30Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 2,60 30,20 1,20 22,00 206,40 2272,80 213,72 1,33 57,37 13,33 59,77 16,97 39,38 sdc 2,40 29,80 0,80 18,80 204,80 2248,80 250,37 1,39 71,09 22,00 73,18 24,79 48,58 sdb 0,00 30,20 0,00 26,40 0,00 2281,60 172,85 2,22 102,58 0,00 102,58 14,18 37,44 sdg 0,00 29,80 0,00 25,80 0,00 2261,60 175,32 1,92 88,72 0,00 88,72 16,98 43,80 sdl 0,00 29,80 0,00 27,40 0,00 2270,40 165,72 1,61 76,81 0,00 76,81 18,00 49,32 sdf 2,60 29,80 1,20 21,80 205,60 2253,60 213,84 0,89 38,50 7,50 40,20 13,70 31,52 sde 0,00 29,80 0,00 23,20 0,00 2257,60 194,62 2,59 132,94 0,00 132,94 18,57 43,08 sdk 2,60 29,80 1,00 23,00 204,00 2261,60 205,47 1,08 44,94 5,20 46,67 15,70 37,68 dm-16 0,00 0,00 14,40 115,80 820,80 6167,20 107,34 114,27 1256,38 11,31 1411,21 7,68 100,02
avg-cpu: %user %nice %system %iowait %steal %idle 2,04 0,00 0,85 4,41 0,00 92,70Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 3,60 31,80 1,20 28,20 255,20 2404,80 180,95 1,82 61,93 167,33 57,45 15,81 46,48 sdc 5,60 33,20 2,00 28,40 460,80 2415,20 189,21 1,55 51,10 73,90 49,49 14,06 42,74 sdb 3,00 31,60 1,40 28,40 256,00 2404,80 178,58 3,35 112,38 119,00 112,05 17,01 50,70 sdg 3,00 32,00 1,20 31,20 255,20 2403,20 164,10 2,15 70,27 187,83 65,75 12,09 39,16 sdl 1,00 32,20 0,60 28,80 101,60 2396,80 169,96 2,30 78,39 12,33 79,76 9,52 28,00 sdf 3,00 32,00 1,40 30,80 262,40 2402,40 165,52 2,92 90,71 107,00 89,97 15,53 50,02 sde 0,60 33,20 0,20 27,60 51,20 2413,60 177,32 1,68 50,91 19,00 51,14 13,02 36,20 sdk 5,20 32,20 2,00 28,80 411,20 2396,80 182,34 2,04 66,21 121,40 62,38 13,56 41,76 dm-16 0,00 0,00 35,00 72,20 2053,60 3369,60 101,18 124,74 1218,62 119,80 1751,29 9,33 100,00
-- WBD, Viacheslav Dubrovskyi
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