Ugh,
disregarding off all previous stamenets:
new findinds: vdsm user can NOT read files larger than 64mb. Root can.
[vdsm@node02:/rhev/data-cente[...]c51d8a18370] $ for i in 60 62 64 66 68
; do dd if=/dev/urandom of=file-$i bs=1M count=$i ; done
[vdsm@node03:/rhev/data-cente[...]c51d8a18370] $ for i in 60 62 64 66 68
; do echo $i ; dd if=file-$i of=/dev/null ; done
60
122880+0 records in
122880+0 records out
62914560 bytes (63 MB) copied, 0.15656 s, 402 MB/s
62
126976+0 records in
126976+0 records out
65011712 bytes (65 MB) copied, 0.172463 s, 377 MB/s
64
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.180701 s, 371 MB/s
66
dd: error reading ‘file-66’: Permission denied
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.105236 s, 638 MB/s
68
dd: error reading ‘file-68’: Permission denied
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.17046 s, 394 MB/s
The files appeared instantly on all nodes, Writing large files work,
however. Writing large files seem to work.
I think this is the core issue.
On 03/02/2020 12:22, Christian Reiss wrote:
Further findings:
- modified data gets written to local node, not across gluster.
- vdsm user can create _new_ files on the cluster, this gets synced
immediatly.
- vdsm can modify, across all nodes newly created files, changes apply
immediately.
I think vdsm user can not modify already existing files over the
gluster. Something selinux?
-Chris.
On 03/02/2020 11:46, Christian Reiss wrote:
Hey,
I think I am barking up the right tree with something (else) here;
Note the timestamps & id's:
dd'ing a disk image as vdsm user, try 1:
[vdsm@node03:/rhev/data-center/mnt/glusterSD/node01.dc-dus.dalason.net:_ssd__storage/fec2eb5e-21b5-496b-9ea5-f718b2cb5556/images/4a55b9c0-d550-4ecb-8dd1-cc1f24f2c7ac]
$ date ; id ; dd if=5fca6d0e-e320-425b-a89a-f80563461add | pv | dd
of=/dev/null
Mon 3 Feb 11:39:13 CET 2020
uid=36(vdsm) gid=36(kvm) groups=36(kvm),107(qemu),179(sanlock)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
dd: error reading ‘5fca6d0e-e320-425b-a89a-f80563461add’: Permission
denied
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.169465 s, 396 MB/s
64MiB 0:00:00 [ 376MiB/s] [ <=>
]
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.171726 s, 391 MB/s
try 2, directly afterward:
[vdsm@node03:/rhev/data-center/mnt/glusterSD/node01.dc-dus.dalason.net:_ssd__storage/fec2eb5e-21b5-496b-9ea5-f718b2cb5556/images/4a55b9c0-d550-4ecb-8dd1-cc1f24f2c7ac]
$ date ; id ; dd if=5fca6d0e-e320-425b-a89a-f80563461add | pv | dd
of=/dev/null
Mon 3 Feb 11:39:16 CET 2020
uid=36(vdsm) gid=36(kvm) groups=36(kvm),107(qemu),179(sanlock)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
dd: error reading ‘5fca6d0e-e320-425b-a89a-f80563461add’: Permission
denied
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.148846 s, 451 MB/s
64MiB 0:00:00 [ 427MiB/s] [ <=>
]
131072+0 records in
131072+0 records out
67108864 bytes (67 MB) copied, 0.149589 s, 449 MB/s
try same as root:
[root@node03:/rhev/data-center/mnt/glusterSD/node01.dc-dus.dalason.net:_ssd__storage/fec2eb5e-21b5-496b-9ea5-f718b2cb5556/images/4a55b9c0-d550-4ecb-8dd1-cc1f24f2c7ac]
# date ; id ; dd if=5fca6d0e-e320-425b-a89a-f80563461add | pv | dd
of=/dev/null
Mon 3 Feb 11:39:33 CET 2020
uid=0(root) gid=0(root) groups=0(root)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
50GiB 0:03:06 [ 274MiB/s] [ <=>
]
104857600+0 records in
104857600+0 records out
53687091200 bytes (54 GB) copied, 186.501 s, 288 MB/s
104857600+0 records in
104857600+0 records out
53687091200 bytes (54 GB) copied, 186.502 s, 288 MB/s
Followed by another vdsm dd test:
[vdsm@node03:/rhev/data-center/mnt/glusterSD/node01.dc-dus.dalason.net:_ssd__storage/fec2eb5e-21b5-496b-9ea5-f718b2cb5556/images/4a55b9c0-d550-4ecb-8dd1-cc1f24f2c7ac]
$ date ; id ; dd if=5fca6d0e-e320-425b-a89a-f80563461add | pv | dd
of=/dev/null
Mon 3 Feb 11:42:46 CET 2020
uid=36(vdsm) gid=36(kvm) groups=36(kvm),107(qemu),179(sanlock)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
50GiB 0:02:56 [ 290MiB/s] [ <=> ]
104857600+0 records in
104857600+0 records out
53687091200 bytes (54 GB) copied, 176.189 s, 305 MB/s
104857600+0 records in
104857600+0 records out
53687091200 bytes (54 GB) copied, 176.19 s, 305 MB/s
So it's a permission problem (access denied) unless root loads it first?
Strange: doing things like file & stat work; I can even cat the meta
file (small text file). Seems only the disk images (or large files?)
are affected.
huh!?
--
with kind regards,
mit freundlichen Gruessen,
Christian Reiss
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