Hi Nick and other Cephers,
Thanks for your reply.
> 2) Config Errors > This can be an easy one to say you are safe from. But I would say most outages and data loss incidents I have seen on the mailing > lists have been due to poor hardware choice or configuring options such as size=2, min_size=1 or enabling stuff like nobarriers.
I am wondering the pros and cons of the nobarrier option used by Ceph.
It is well known that nobarrier is dangerous when power outage happens, but if we already have replicas in different racks or PDUs, will Ceph reduce the risk of data lost with this option?
I have seen many performance tuning articles providing nobarrier option in xfs, but there are not many of then mention the trade-off of nobarrier.
Is it really unacceptable to use nobarrier in production environment? I will be much grateful if you guys are willing to share any experiences about nobarrier and xfs.
Sincerely,
Craig Chi (Product Developer)
Synology Inc. Taipei, Taiwan. Ext. 361
Craig Chi (Product Developer)
Synology Inc. Taipei, Taiwan. Ext. 361
On 2016-11-17 05:04, Nick Fisk <nick@xxxxxxxxxx> wrote:
> -----Original Message----- > From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Pedro Benites > Sent: 16 November 2016 17:51 > To: ceph-users@xxxxxxxxxxxxxx > Subject: how possible is that ceph cluster crash > > Hi, > > I have a ceph cluster with 50 TB, with 15 osds, it is working fine for one year and I would like to grow it and migrate all my old storage, > about 100 TB to ceph, but I have a doubt. How possible is that the cluster fail and everything went very bad? Everything is possible, I think there are 3 main risks 1) Hardware failure I would say Ceph is probably one of the safest options in regards to hardware failures, certainly if you start using 4TB+ disks. 2) Config Errors This can be an easy one to say you are safe from. But I would say most outages and data loss incidents I have seen on the mailing lists have been due to poor hardware choice or configuring options such as size=2, min_size=1 or enabling stuff like nobarriers. 3) Ceph Bugs Probably the rarest, but potentially the most scary as you have less control. They do happen and it's something to be aware of How reliable is ceph? > What is the risk about lose my data.? is necessary backup my data? Yes, always backup your data, no matter solution you use. Just like RAID != Backup, neither does ceph. > > Regards. > Pedro. > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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