Hi all,
I am new to Ceph. But I have a some good understanding of iSCSI protocol. I
will dive into Ceph because it looks promising. I am particularly
interested in Ceph-RBD. I have a request. Can you please tell me, if any,
what are the common similarities between iSCSI and Ceph. If someone has to
work on a common model for iSCSI and Ceph, what would be those significant
points you would suggest to someone who has some understanding of iSCSI?
Looking forward to answers. Thanks in advance :-)
BR
I have a 3 hosts, 10 4TB HDDs per host ceph storage set up. I deined a 3 replica rbd pool and some images and presented them to a Vmware host via ISCSI, but the write performance is so bad the I managed to freeze a VM doing a big rsync to a datastore inside ceph and had to reboot it's host (seems I've filled up Vmware's ISCSI queue).
Right now I'm getting write latencies from 20ms to 80 ms (per OSD) and sometimes peaking at 600 ms (per OSD).
Client throughput is giving me around 4 MBs.
Using a 4MB stripe 1 image I got 1.955..359 B/s inside the VM.
On a 1MB stripe 1 I got 2.323.206 B/s inside the same VM.
I think the performance is way too slow, much more than should be and that I can fix this by correcting some configuration.
Any advices?
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Salsa
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Hi there!
I got the task to connect a Windows client to our existing ceph cluster.
I'm looking for experiences or suggestions from the community.
There came two possibilities to my mind:
1. iSCSI Target on RBD exported to Windows
2. NFS-Ganesha on CephFS exported to Windows
Is there a third way exporting a ceph cluster to a windows machine?
I have some experiences with CephFS. We have a small cluster successfully running for linux clients. I don't have experiences with RBD or iSCSI.
The Windows machine will use the space for backups. The kind of data is unknown. I expect the data to be a MS-SQL dump and user data from a sharepoint system. The Windows admin does not care whether NFS or iSCSI is used.
I'd be happy if some of you could share experiences.
Thanks
Lars
Hello, Ceph users,
does anybody use Ceph on recently released CentOS 8? Apparently there are
no el8 packages neither at download.ceph.com, nor in the native CentOS package
tree. I am thinking about upgrading my cluster to C8 (because of other
software running on it apart from Ceph). Do el7 packages simply work?
Can they be rebuilt using rpmbuild --rebuild? Or is running Ceph on
C8 more complicated than that?
Thanks,
-Yenya
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| Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> |
| http://www.fi.muni.cz/~kas/ GPG: 4096R/A45477D5 |
sir_clive> I hope you don't mind if I steal some of your ideas?
laryross> As far as stealing... we call it sharing here. --from rcgroups
Hello Team,
We've integrated Ceph cluster storage with Kubernetes and provisioning
volumes through rbd-provisioner. When we're creating volumes from yaml
files in Kubernetes, pv > pvc > mounting to pod, In kubernetes end pvc are
showing as meaningful naming convention as per yaml file defined. But in
ceph cluster, rbd image name is creating with dynamic uid.
During troubleshooting time, this will be tedious to find exact rbd image.
Please find the provisioning logs in below pasted snippet.
kubectl get pods,pv,pvc
NAME READY STATUS RESTARTS AGE
pod/sleepypod 1/1 Running 0 4m9s
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON
AGE
persistentvolume/pvc-cd37d2d6-cecc-4a05-9736-c8d80abde7f5 1Gi RWO Delete
Bound default/test-dyn-pvc ceph-rbd 4m9s
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
persistentvolumeclaim/test-dyn-pvc Bound
pvc-cd37d2d6-cecc-4a05-9736-c8d80abde7f5 1Gi RWO ceph-rbd 4m11s
*rbd-provisioner logs*
I1121 10:59:15.009012 1 provision.go:132] successfully created rbd image
"kubernetes-dynamic-pvc-f4eac482-0c4d-11ea-8d70-8a582e0eb4e2" I1121
10:59:15.009092 1 controller.go:1087] provision "default/test-dyn-pvc"
class "ceph-rbd": volume "pvc-cd37d2d6-cecc-4a05-9736-c8d80abde7f5"
provisioned I1121 10:59:15.009138 1 controller.go:1101] provision
"default/test-dyn-pvc" class "ceph-rbd": trying to save persistentvvolume
"pvc-cd37d2d6-cecc-4a05-9736-c8d80abde7f5" I1121 10:59:15.020418 1
controller.go:1108] provision "default/test-dyn-pvc" class "ceph-rbd":
persistentvolume "pvc-cd37d2d6-cecc-4a05-9736-c8d80abde7f5" saved I1121
10:59:15.020476 1 controller.go:1149] provision "default/test-dyn-pvc"
class "ceph-rbd": succeeded I1121 10:59:15.020802 1 event.go:221]
Event(v1.ObjectReference{Kind:"PersistentVolumeClaim", Namespace:"default",
Name:"test-dyn-pvc", UID:"cd37d2d6-cecc-4a05-9736-c8d80abde7f5",
APIVersion:"v1", ResourceVersion:"24545639", FieldPath:""}): type: 'Normal'
reason: 'ProvisioningSucceeded' Successfully provisioned volume
pvc-cd37d2d6-cecc-4a05-9736-c8d80abde7f5
*rbd image details in Ceph cluster end*
rbd -p kube ls --long
NAME SIZE PARENT FMT PROT LOCK
kubernetes-dynamic-pvc-f4eac482-0c4d-11ea-8d70-8a582e0eb4e2 1 GiB 2
is there way to setup proper naming convention for rbd image as well during
kubernetes deployment itself.
Kubernetes version: v1.15.5
Ceph cluster version: 14.2.2 nautilus (stable)
*Best Regards,*
*Palanisamy*
Hi,
running 14.2.6, debian buster (backports).
Have set up a cephfs with 3 data pools and one metadata pool:
myfs_data, myfs_data_hdd, myfs_data_ssd, and myfs_metadata.
The data of all files are with the use of ceph.dir.layout.pool either
stored in the pools myfs_data_hdd or myfs_data_ssd. This has also been
checked by dumping the ceph.file.layout.pool attributes of all files.
The filesystem has 1617949 files and 36042 directories.
There are however approximately as many objects in the first pool created
for the cephfs, myfs_data, as there are files. They also becomes more or
fewer as files are created or deleted (so cannot be some leftover from
earlier exercises). Note how the USED size is reported as 0 bytes,
correctly reflecting that no file data is stored in them.
POOL_NAME USED OBJECTS CLONES COPIES MISSING_ON_PRIMARY UNFOUND DEGRADED RD_OPS RD WR_OPS WR USED COMPR UNDER COMPR
myfs_data 0 B 1618229 0 4854687 0 0 0 2263590 129 GiB 23312479 124 GiB 0 B 0 B
myfs_data_hdd 831 GiB 136309 0 408927 0 0 0 106046 200 GiB 269084 277 GiB 0 B 0 B
myfs_data_ssd 43 GiB 1552412 0 4657236 0 0 0 181468 2.3 GiB 4661935 12 GiB 0 B 0 B
myfs_metadata 1.2 GiB 36096 0 108288 0 0 0 4828623 82 GiB 1355102 143 GiB 0 B 0 B
Is this expected?
I was assuming that in this scenario, all objects, both their data and any
keys would be either in the metadata pool, or the two pools where the
objects are stored.
Is it some additional metadata keys that are stored in the first
created data pool for cephfs? This would not be so nice in case the osd
selection rules for it are using worse disks than the data itself...
Btw: is there any tool to see the amount of key value data size associated
with a pool? 'ceph osd df' gives omap and meta for osds, but not broken
down per pool.
Best regards,
Håkan
hi,every one,
my ceph version 12.2.12，I want to set require min compat client
luminous,I use command
#ceph osd set-require-min-compat-client luminous
but ceph report:Error EPERM: cannot set require_min_compat_client to
luminous: 4 connected client(s) look like jewel (missing
0xa00000000200000); add --yes-i-really-mean-it to do it anyway
[root@node-1 ~]# ceph features
{
"mon": {
"group": {
"features": "0x3ffddff8eeacfffb",
"release": "luminous",
"num": 3
}
},
"osd": {
"group": {
"features": "0x3ffddff8eeacfffb",
"release": "luminous",
"num": 15
}
},
"client": {
"group": {
"features": "0x40106b84a842a52",
"release": "jewel",
"num": 4
},
"group": {
"features": "0x3ffddff8eeacfffb",
"release": "luminous",
"num": 168
}
}
}
so,I run command:
[root@node-1 gyt]# ceph osd set-require-min-compat-client luminous
--yes-i-really-mean-it
set require_min_compat_client to luminous
but now,I want to set require min compat client jewel,I use command：
[root@node-1 gyt]# ceph osd set-require-min-compat-client jewel
Error EPERM: osdmap current utilizes features that require luminous;
cannot set require_min_compat_client below that to jewel
what‘s the way we are set luminous chang to jewel？
Quick question Ceph guru's.
For a 1.1PB raw cephfs system currently storing 191TB of data and 390 million objects (mostly small Python, ML training files etc.) how many MDS servers should I be running?
System is Nautilus 14.2.8.
I ask because up to know I have run one MDS with one standby-replay and occasionally it blows up with large memory consumption, 60Gb+ even though I have mds_cache_memory_limit = 32G and that was 16G until recently. It of course tries to restart on another MDS node fails again and after several attempts usually comes back up. Today I increased to two active MDS's but the question is what is the optimal number for a pretty active system? The single MDS seemed to regularly run around 1400 req/s and I often get up to six clients failing to respond to cache pressure.
The current setup is:
ceph fs status
cephfs - 71 clients
======
+------+----------------+--------+---------------+-------+-------+
| Rank | State | MDS | Activity | dns | inos |
+------+----------------+--------+---------------+-------+-------+
| 0 | active | a | Reqs: 447 /s | 12.0M | 11.9M |
| 1 | active | b | Reqs: 154 /s | 1749k | 1686k |
| 1-s | standby-replay | c | Evts: 136 /s | 1440k | 1423k |
| 0-s | standby-replay | d | Evts: 402 /s | 16.8k | 298 |
+------+----------------+--------+---------------+-------+-------+
+-----------------+----------+-------+-------+
| Pool | type | used | avail |
+-----------------+----------+-------+-------+
| cephfs_metadata | metadata | 160G | 169G |
| cephfs_data | data | 574T | 140T |
+-----------------+----------+-------+-------+
+-------------+
| Standby MDS |
+-------------+
| w |
| x |
| y |
| z |
+-------------+
MDS version: ceph version 14.2.8 (2d095e947a02261ce61424021bb43bd3022d35cb) nautilus (stable)
Regards.
Robert Ruge
Systems & Network Manager
Faculty of Science, Engineering & Built Environment
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This is the second time this happened in a couple of weeks. The MDS locks
up and the stand-by can't take over so the Montiors black list them. I try
to unblack list them, but they still say this in the logs
mds.0.1184394 waiting for osdmap 234947 (which blacklists prior instance)
Looking at a pg dump, it looks like the epoch is passed that.
$ ceph pg map 3.756
osdmap e234953 pg 3.756 (3.756) -> up [113,180,115] acting [113,180,115]
Last time, it seemed to just recover after about an hour all by it's self.
Any way to speed this up?
Thank you,
Robert LeBlanc
----------------
Robert LeBlanc
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