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Edward, got it - there is a small threshold (10GB) on minimum free space on CS’es (reserved for different cases include recovery),
<div>you have ~10GB per CS so you hit this threshold immediately.</div>
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<div>Most likely you run from inside VMs, right? Just increase disk space available to CS then.</div>
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<div>On 29 Jan 2014, at 21:04, Edward Konetzko <<a href="mailto:konetzed@gmail.com">konetzed@gmail.com</a>> wrote:</div>
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<div class="moz-cite-prefix">[konetzed@ovz2 ~]$ sudo pstorage -c test_cluster stat<br>
connected to MDS#3<br>
Cluster 'test_cluster': healthy<br>
Space: [OK] allocatable 28GB of 35GB, free 31GB of 35GB<br>
MDS nodes: 3 of 3, epoch uptime: 10h 25m<br>
CS nodes: 3 of 3 (3 avail, 0 inactive, 0 offline)<br>
License: [Error] License not loaded, capacity limited to 100Gb<br>
Replication: 1 norm, 1 limit<br>
Chunks: [OK] 1 (100%) healthy, 0 (0%) standby, 0 (0%) degraded, 0 (0%) urgent,<br>
0 (0%) blocked, 0 (0%) pending, 0 (0%) offline, 0 (0%) replicating,<br>
0 (0%) overcommitted, 0 (0%) deleting, 0 (0%) void<br>
FS: 10KB in 2 files, 2 inodes, 1 file maps, 1 chunks, 1 chunk replicas<br>
IO: read 0B/s ( 0ops/s), write 0B/s ( 0ops/s)<br>
IO total: read 0B ( 0ops), write 0B ( 0ops)<br>
Repl IO: read 0B/s, write: 0B/s<br>
Sync rate: 0ops/s, datasync rate: 0ops/s<br>
<br>
MDSID STATUS %CTIME COMMITS %CPU MEM UPTIME HOST <br>
1 avail 3.1% 1/s 0.1% 14m 9h 58m ovz1.home.int:2510 <br>
2 avail 2.5% 0/s 0.0% 14m 9h 14m ovz2.home.int:2510 <br>
M 3 avail 3.0% 1/s 0.3% 15m 10h 25m ovz3.home.int:2510 <br>
<br>
CSID STATUS SPACE FREE REPLICAS IOWAIT IOLAT(ms) QDEPTH HOST <br>
1025 active 11GB 10GB 0 0% 0/0 0.0 ovz1.home.int <br>
1026 active 11GB 10GB 0 0% 0/0 0.0 ovz2.home.int <br>
1027 active 11GB 10GB 1 0% 0/0 0.0 ovz3.home.int <br>
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CLID LEASES READ WRITE RD_OPS WR_OPS FSYNCS IOLAT(ms) HOST <br>
2060 0/0 0B/s 0B/s 0ops/s 0ops/s 0ops/s 0/0 ovz3.home.int
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2065 0/1 0B/s 0B/s 0ops/s 0ops/s 0ops/s 0/0 ovz1.home.int
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I do have skype but I have meetings all day for work and cant be on a computer after. I may have time tomorrow if that would work. I am in the central time zone.<br>
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Edward<br>
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On 01/29/2014 03:14 AM, Kirill Korotaev wrote:<br>
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Edward,
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<div>can you send me in private email output of:</div>
<div># pstorage -c <cluster> stat</div>
<div>output?</div>
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<div>Do you have a skype?</div>
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<div>Thanks,</div>
<div>Kirill</div>
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<div>On 29 Jan 2014, at 10:26, Edward Konetzko <<a moz-do-not-send="true" href="mailto:konetzed@gmail.com">konetzed@gmail.com</a>> wrote:</div>
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<div class="moz-cite-prefix">On 01/28/2014 09:51 AM, Kir Kolyshkin wrote:<br>
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<div class="gmail_quote">On 28 January 2014 02:55, Kirill Korotaev <span dir="ltr">
<<a moz-do-not-send="true" href="mailto:dev@parallels.com" target="_blank">dev@parallels.com</a>></span> wrote:<br>
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<div class="im">>> On 25 Jan 2014, at 07:38, Rene C. <a moz-do-not-send="true" href="mailto:openvz@dokbua.com">
openvz@dokbua.com</a> wrote:<br>
>><br>
><br>
> Hi,<br>
><br>
> I read the website about the cloud storage and I found some words, which seems familiar for me.<br>
><br>
> May I ask, which filesystem do you use to be able to regularly scrub and self-heal the filesystem?<br>
><br>
> Personaly I use zfsonlinux in production for a long time now and I am very satisfied with it, and based on your description, it seems you should use something like that and something on top of the native filesystem to get a cloud storage.<br>
><br>
> Or you use a ceph or alike "filesystem", which has similar capabilities with cloud features.<br>
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It’s more like a ceph. Data is stored in a distributed way, so unlike to zfs you have access to the data even in case of node failure (crash, CPU/memory fault etc.) and access is available from ANY cluster node.<br>
As such we store the data and maintain checksums on every node and can do periodic scrubbing of the data.<br>
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<div>Just to clarify -- this is Parallels own distributed/cloud filesystem, not CEPH or GlusterFS,</div>
<div>but similar to. For more info, check the links at <a moz-do-not-send="true" href="https://openvz.org/Parallels_Cloud_Storage#External_links">https://openvz.org/Parallels_Cloud_Storage#External_links</a></div>
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Setup a cluster using Centos 6.5 64bit, fresh install in KVM instances. I wanted to test functionality not actual speed.
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All software was latest as of last night and I followed the quick how to here <a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://openvz.org/Parallels_Cloud_Storage">
https://openvz.org/Parallels_Cloud_Storage</a><br>
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Everything works great until I try to create an instance using the command "vzctl create 101 --layout ploop --ostemplate centos-6-x86_64 --private /pcs/containers/101" from the docs.<br>
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About one mb of data is written to disk and then it just hangs. The following is output from dmesg<br>
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[ 360.414242] INFO: task vzctl:1646 blocked for more than 120 seconds.<br>
[ 360.414770] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.<br>
[ 360.415406] vzctl D ffff88007e444500 0 1646 1611 0 0x00000084<br>
[ 360.415418] ffff88007ea59a68 0000000000000086 ffff8800ffffffff 000006b62934b8c0<br>
[ 360.415428] 0000000000000000 ffff88007e9f2ad0 0000000000005eaa ffffffffad17694d<br>
[ 360.415437] 000000000ad7ef74 ffffffff81a97b40 ffff88007e444ac8 000000000001eb80<br>
[ 360.415452] Call Trace:<br>
[ 360.415492] [<ffffffff81517353>] io_schedule+0x73/0xc0<br>
[ 360.415516] [<ffffffff811f39b3>] wait_on_sync_kiocb+0x53/0x80<br>
[ 360.415537] [<ffffffffa04dbf47>] fuse_direct_IO+0x167/0x230 [fuse]<br>
[ 360.415558] [<ffffffff8112e948>] mapping_direct_IO+0x48/0x70<br>
[ 360.415567] [<ffffffff811301a6>] generic_file_direct_write_iter+0xf6/0x170<br>
[ 360.415576] [<ffffffff81130c8e>] __generic_file_write_iter+0x32e/0x420<br>
[ 360.415585] [<ffffffff81130e05>] __generic_file_aio_write+0x85/0xa0<br>
[ 360.415594] [<ffffffff81130ea8>] generic_file_aio_write+0x88/0x100<br>
[ 360.415605] [<ffffffffa04da085>] fuse_file_aio_write+0x185/0x430 [fuse]<br>
[ 360.415623] [<ffffffff811a530a>] do_sync_write+0xfa/0x140<br>
[ 360.415641] [<ffffffff8109d930>] ? autoremove_wake_function+0x0/0x40<br>
[ 360.415655] [<ffffffff812902da>] ? strncpy_from_user+0x4a/0x90<br>
[ 360.415664] [<ffffffff811a55e8>] vfs_write+0xb8/0x1a0<br>
[ 360.415671] [<ffffffff811a5ee1>] sys_write+0x51/0x90<br>
[ 360.415681] [<ffffffff8100b102>] system_call_fastpath+0x16/0x1b<br>
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Even just trying to create a 10k file with dd causes a task to hang. "dd if=/dev/zero of=/pcs/test.junk bs=1k count=10"<br>
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Any ideas? Anymore info you would like for debugging. <br>
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