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тАО11-17-2003 08:52 AM
тАО11-17-2003 08:52 AM
I am looking into implementing an HA FTP server; I am looking at LVS, this looks promising. Have any one ever done this before? Does any one have any suggestions?
In regards to LVS, in my case, implementing HA ftp server, I need to be able to share storage, either by replicating via some software (e.g: CODA file system) or via hardwared. I am interested in how someone handles the shared storage issue. Thanks.
Solved! Go to Solution.
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тАО11-17-2003 09:07 AM
тАО11-17-2003 09:07 AM
Re: HA ftp server ...
I have made a HA cluster using drbd that worked very nicely. I would recommend drbd to anyone looking to replicate data between two machines.
drbd homepage:
http://www.drbd.org/
If you have the money you could use shared scsi but the cost is pretty high and unecessary unless you need fast disks.
I hope that helps,
Dave
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тАО11-17-2003 10:17 AM
тАО11-17-2003 10:17 AM
Re: HA ftp server ...
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тАО11-17-2003 10:49 AM
тАО11-17-2003 10:49 AM
Re: HA ftp server ...
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тАО11-17-2003 03:07 PM
тАО11-17-2003 03:07 PM
Re: HA ftp server ...
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тАО11-17-2003 03:51 PM
тАО11-17-2003 03:51 PM
Re: HA ftp server ...
Best I have seen with my own eyes using shared scsi was two boxes in an active passive HA cluster serving NFS. It was quick but expensive. If I remember correctly the scsi raid chassis filled with disks, with two scsi controllers was over $20 000 alone, then the two servers were over $10 000 each, with multiple aggregated gigE interfaces, it was smoking fast, but the price tag was pushing $50000.
Or you can make an HA cluster on the cheap out of spare parts. Take two identical older machines, say dual p3 800's with a gig of PC 133 ram each. Now take about 4 10/100 ethernet cards. Pop in a couple of disks, faster the better. Take three of the network cards and bond them together. Your kernel has to support the bonding driver. This is 802.3AD if I remember correctly, so you can read up on that spec to see whats going on in an aggregated ethernet link if you want. Here is a link to the IEEE web page:
http://grouper.ieee.org/groups/802/3/ad/
Now that you have a bonded ethernet link that should approach about 250 Mips on each server connect a pile of crossover cables between the servers. This is you interserver communication link that we are going to use for drbd to keep your disks sync'd. Get drbd working over this link, install your ftp server of choice. Also connect a serial cable between the boxes so you can halt the machine if the network croaks. Make sure to run some kind of STONITH script so that a failing machine can't take you out. That should be plenty HA enough for a small time ftp server.
Might be something worth looking at:
http://www.linux-ha.org/
Loads of good ideas.
I hope that helps.
Dave
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тАО11-17-2003 03:53 PM
тАО11-17-2003 03:53 PM
Re: HA ftp server ...
http://www.ibiblio.org/pub/Linux/ALPHA/linux-ha/High-Availability-HOWTO-7.html
Thats a quick one I found giving you an over view of whats going on with shared scsi
Dave
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тАО11-18-2003 12:28 PM
тАО11-18-2003 12:28 PM
Re: HA ftp server ...
BTW, the cheap HA setup sounds interesting. I will follow up with your url. Thanks.
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тАО11-18-2003 02:50 PM
тАО11-18-2003 02:50 PM
Re: HA ftp server ...
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тАО11-18-2003 02:54 PM
тАО11-18-2003 02:54 PM
SolutionNothing like a drunking typo to ruin your week:
mv /tmp/foo /tmp/bar
can easily become
rm /
:)
I hope that helps,
dave