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0

To throw in my $.02: Take a look at ceph. Throw at it half a gigabyte of memory on each server (make them all OSDs) and designate three servers as MDS/MON (depending on the load they may or may not run other intensive stuff as well). Use it as a object storage or as a block device or as a filesystem ... that is up to you ... It can be redundat and it can ...


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I believe LizardFS and GfarmFS are well suited for the task. Both storage systems use metadata (i.e. directory) servers allowing low-latency operations on millions of files. LizardFS "master" (i.e. metadata server) uses RAM (memory footprint is less than 3 GiB for 7_000_000 files) while GfarmFS metadata server uses PostgreSQL.


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I recommend excellent LizardFS and GfarmFS although I'm not sure how well they support locks.


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We have deployed a similiar setup with Atomic (http://www.projectatomic.io/) instead of CoreOS to a replicated non-distributed GlusterFS storage system with three replica-2 sets. This works very well. However, you need to keep a few special characteristics of GlusterFS in mind. Like Brian already mentioned, Gluster places consistency and reliability above ...


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HA is a fairly broad subject in terms of the particular entities you want to enable HA for. For example, web server, network gears, databases, etc. The general idea is to avoid single-point-of-failures. In your case, you want to enable HA on a web server and there are two approaches I could think of at the moment: Active/Active and Active/Passive (These two ...


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For me, one of the most obvious solutions to doing HA over more than two hosts is Load Balancing, even though the name does not suggest HA. What kind of LB is most suitable for your use-case really depends on the type of client and app, but the three most common options. L7 load balancing. You have a proxy that understands the protocol used. There are many ...


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You are confusing DNS and High Availability. Repeat after me: DNS is not failover. DNS is not failover. DNS is not failover. If you want to do high availability and load balancing, you need a reverse proxy that specialises in this. The most well known one is haproxy.


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You have the problem described already: B tries unsuccessfully to bring A down, cause A's IPMI is unreachable. Unless B can complete a successful fence operation, it will hang to avoid split-brain scenario. You can mitigate this by configuring secondary fencing mechanism.


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I was not able to find an official way to handle this, so I went with the idea of dumping the tables individually and reimporting them. Not wanting to do it by hand, I whipped a PHP script to do it for me. I'm posting it here in case anyone else finds this useful. /* * InnoDB Convert * Converts existing non-InnoDB tables to InnoDB, then re-imports the ...


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Using weak or identical passwords, even on an internal system should make any system administrator shiver and should never be done. Providing VPN access or a Jump-host would be the way to go. Then by using public key authentication you can allow specific hosts to connect to all machines without even needing to provide the password, and it will be easy to ...


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A unit that can't be scheduled just stays down. When a suitable machine rejoins the cluster, the unit will be started again. That shouldn't be a big problem in your example, since there's not a lot of point having two identical apache units running on the same machine.


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The NetworkTopologySettings needs to be specified as part of the create keyspace statement.


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I finally found the answer to this. At first I used the the above -l excl=True setup as described above. However this does not quite solve the problem. To fully solve the problem I had to set up and additional pe_environment. On my cluster we have a number of 12 core nodes. So I will use this as my example. I created an additional environment called ...


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I use expect scripts to automate the logins (especially because I have to pass through a jumb box and enter in a chroot and lots of passwords must be entered) and did some "tweaks" to the config of cssh. So, I have this "main script" in my bin folder that given a "server name/alias" it takes me into the server that I want and where I want. In the ...


2

You've got an internal FC bus error - very likely to be a hardware issue. You'd going to have to get NetApp to fix the broken bit sorry. If you have no support contract can you let me know where you are in the world please, I have a few spare FAS2020's at my storage location in the UK, if you're nearby you could have one or the part.



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