디스크 쓰기 속도가 느립니다.

내 데이터베이스 애플리케이션을 위해 새로운 debian 9.8 서버를 설치했습니다. 두 개의 디스크가 있으며 vCenter 6.0에서 실행됩니다.

디스크 쓰기 속도는 첫 번째 쓰기에서 100-120Mb/sec였으며 이후 디스크 쓰기 속도는 1-5Mb/sec로 급격히 떨어졌습니다.

• 데이터 저장소를 완전히 다른 저장소로 변경했습니다. 동일한 문제가 여전히 존재합니다.
• 커널을 새 커널(5.0.14)로 업데이트했습니다. 아무 일도 일어나지 않았습니다.
• 나는 추가했다noobstacle=0 noatimefstab에서도 같은 문제가 계속됩니다.
• 디스크를 마운트 해제하고 fsck에도 동일한 문제가 계속됩니다.

이 마운트 출력은;

sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=32686212k,nr_inodes=53329,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=6539196k,mode=755)
/dev/mapper/DPADBSRV1--vg-root on / type ext4 (rw,noatime,nobarrier,errors=remount-ro)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=31,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12165)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
/dev/sdb1 on /data type ext4 (rw,noatime,nobarrier)
/dev/sda1 on /boot type ext2 (rw,relatime,block_validity,barrier,user_xattr,acl)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=2344888k,mode=700,uid=1000,gid=1000)

이것은 한 시간 안에 완료되는 추가 테스트입니다.

134217728 bytes (134 MB, 128 MiB) copied, 1.34163 s, 100 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.43202 s, 93.7 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.40082 s, 95.8 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.31636 s, 102 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.39147 s, 96.5 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.81849 s, 73.8 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1G count=1
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 16.4479 s, 65.3 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 1.40814 s, 95.3 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 9.36281 s, 14.3 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 3.23355 s, 41.5 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 35.4718 s, 3.8 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 33.546 s, 4.0 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128
128+0 records in
128+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 61.1867 s, 2.2 MB/s
root@DP1:/home/debian# dd if=/dev/zero of=tempfile bs=1M count=128