# ES can't get btrfs filesystem stats **URL:** \ **Category:** Elasticsearch\ **Created:** [April 7, 2020, 9:25am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858 "2020-04-07T09:25:33Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![LoadingZhang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/loadingzhang/32/22391_2.png) [@LoadingZhang](https://discuss.elastic.co/u/LoadingZhang)\ **Post date:** [April 7, 2020, 9:25am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/1 "2020-04-07T09:25:33Z")
if ES data store in btrfs filesystem partition, then `GET _nodes/stats/fs` will return empty `io_stats` field. such as : ```auto "fs" : { "timestamp" : 1586250875508, "total" : { "total_in_bytes" : 40002251653120, "free_in_bytes" : 16212569772032, "available_in_bytes" : 16206380437504 }, "data" : [ { "path" : "/home/data/cluster/nodes/0", "mount" : "/home/data (/dev/sdb)", "type" : "btrfs", "total_in_bytes" : 40002251653120, "free_in_bytes" : 16212569772032, "available_in_bytes" : 16206380437504 } ], "io_stats" : { } } ``` is there any way to fix it? ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [April 7, 2020, 9:38am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/2 "2020-04-07T09:38:25Z")
What OS are you using? On Linux, these stats come from `/proc/diskstats` and I am unaware of any difference between `btrfs` and other filesystems. On other operating systems these stats are always omitted, regardless of the filesystem. ---
**Author:** ![LoadingZhang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/loadingzhang/32/22391_2.png) [@LoadingZhang](https://discuss.elastic.co/u/LoadingZhang)\ **Post date:** [April 7, 2020, 11:10am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/3 "2020-04-07T11:10:47Z")
CentOS 7/Kernel 3.10 or 5.6 ES can get io\_stats when using ext4 or xfs but btrfs is empty on same system envrioment. here is /proc/diskstats: ```auto grep sdb /proc/diskstats 8 16 sdb 586393003 109982 30391265392 2199288329 262632645 14809281 122797050312 689016458 0 60590581 2473033176 0 0 0 0 ``` it seems read/write stats are no zero but es not display. ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [April 7, 2020, 11:44am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/4 "2020-04-07T11:44:01Z")
Hmm interesting. Can you share the full contents of `/proc/diskstats` and `/proc/self/mountinfo` on your system? ---
**Author:** ![LoadingZhang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/loadingzhang/32/22391_2.png) [@LoadingZhang](https://discuss.elastic.co/u/LoadingZhang)\ **Post date:** [April 7, 2020, 11:49am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/5 "2020-04-07T11:49:26Z")
cat /proc/diskstats ```auto 8 0 sda 550581 100954 20600999 7659539 2261901 4764090 60133176 569017 0 1299335 7604460 0 0 0 0 8 1 sda1 2551 250 51787 19563 41603 41723 166640 10685 0 15832 22195 0 0 0 0 8 2 sda2 547975 100704 20548716 7639799 2220298 4722367 59966536 558332 0 1285305 7582106 0 0 0 0 8 16 sdb 595266938 110437 30526567808 2308165797 265830085 14961235 124298952064 698124969 0 61249750 2585041124 0 0 0 0 253 0 dm-0 494549 0 16021346 6071228 6327522 0 53128168 1262236 0 1083676 7333464 0 0 0 0 253 1 dm-1 129 0 1912 328 0 0 0 0 0 45 328 0 0 0 0 253 2 dm-2 160731 0 4524746 2645426 615147 0 6838368 99124 0 215664 2744550 0 0 0 0 ``` cat /proc/self/mountinfo ```auto 22 68 0:21 / /sys rw,nosuid,nodev,noexec,relatime shared:6 - sysfs sysfs rw 23 68 0:5 / /proc rw,nosuid,nodev,noexec,relatime shared:5 - proc proc rw 24 68 0:6 / /dev rw,nosuid shared:2 - devtmpfs devtmpfs rw,size=65951280k,nr_inodes=16487820,mode=755 25 22 0:7 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:7 - securityfs securityfs rw 26 24 0:22 / /dev/shm rw,nosuid,nodev shared:3 - tmpfs tmpfs rw 27 24 0:23 / /dev/pts rw,nosuid,noexec,relatime shared:4 - devpts devpts rw,gid=5,mode=620,ptmxmode=000 28 68 0:24 / /run rw,nosuid,nodev shared:23 - tmpfs tmpfs rw,mode=755 29 22 0:25 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:8 - tmpfs tmpfs ro,mode=755 30 29 0:26 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:9 - cgroup cgroup rw,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 31 22 0:27 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:21 - pstore pstore rw 32 29 0:28 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:10 - cgroup cgroup rw,blkio 33 29 0:29 / /sys/fs/cgroup/pids rw,nosuid,nodev,noexec,relatime shared:11 - cgroup cgroup rw,pids 34 29 0:30 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:12 - cgroup cgroup rw,cpuset 35 29 0:31 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:13 - cgroup cgroup rw,memory 36 29 0:32 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:14 - cgroup cgroup rw,cpu,cpuacct 37 29 0:33 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,freezer 38 29 0:34 / /sys/fs/cgroup/rdma rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,rdma 39 29 0:35 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,devices 40 29 0:36 / /sys/fs/cgroup/net_cls,net_prio rw,nosuid,nodev,noexec,relatime shared:18 - cgroup cgroup rw,net_cls,net_prio 41 29 0:37 / /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,perf_event 42 29 0:38 / /sys/fs/cgroup/hugetlb rw,nosuid,nodev,noexec,relatime shared:20 - cgroup cgroup rw,hugetlb 65 22 0:39 / /sys/kernel/config rw,relatime shared:22 - configfs configfs rw 68 1 253:0 / / rw,relatime shared:1 - ext4 /dev/mapper/vg_root-lv_root rw 21 23 0:20 / /proc/sys/fs/binfmt_misc rw,relatime shared:24 - autofs systemd-1 rw,fd=36,pgrp=1,timeout=300,minproto=5,maxproto=5,direct,pipe_ino=3534 43 24 0:19 / /dev/mqueue rw,relatime shared:25 - mqueue mqueue rw 44 22 0:8 / /sys/kernel/debug rw,relatime shared:26 - debugfs debugfs rw 45 24 0:41 / /dev/hugepages rw,relatime shared:27 - hugetlbfs hugetlbfs rw,pagesize=2M 77 68 8:1 / /boot rw,relatime shared:28 - ext4 /dev/sda1 rw 79 68 253:2 / /home rw,relatime shared:29 - ext4 /dev/mapper/vg_root-lv_home rw 81 68 0:43 / /var/lib/nfs/rpc_pipefs rw,relatime shared:30 - rpc_pipefs sunrpc rw 85 79 0:42 / /home/data rw,noatime shared:31 - btrfs /dev/sdb rw,nodatasum,nodatacow,nobarrier,space_cache=v2,autodefrag,subvolid=5,subvol=/ 84 28 0:46 / /run/user/0 rw,nosuid,nodev,relatime shared:32 - tmpfs tmpfs rw,size=13192872k,mode=700 ``` ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [April 7, 2020, 11:54am UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/6 "2020-04-07T11:54:55Z")
> [@LoadingZhang](#): > > `85 79 0:42 / /home/data rw,noatime shared:31 - btrfs /dev/sdb rw,nodatasum,nodatacow,nobarrier,space_cache=v2,autodefrag,subvolid=5,subvol=/` Ok, this is reporting the major/minor versions of the device holding `/home/data` as `0:42` and `/proc/diskstats` doesn't contain any information for such a device, claiming instead that `sdb` is `8:16`. ---
**Author:** ![LoadingZhang](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/loadingzhang/32/22391_2.png) [@LoadingZhang](https://discuss.elastic.co/u/LoadingZhang)\ **Post date:** [April 7, 2020, 12:35pm UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/7 "2020-04-07T12:35:52Z")
thanks for help ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 5, 2020, 12:35pm UTC](https://discuss.elastic.co/t/es-cant-get-btrfs-filesystem-stats/226858/8 "2020-05-05T12:35:54Z")
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