Hi,
we are about to buy some large (at least for us) RAID arrays
(Overland/Xyratex 48x S-SATA). We'll start with ~30 TB and end with
~100 TB. The data will mainly be video data, each file with a size of
2 GB + some meta data. The RAID will be attached by Fibre Channel to
an Debian Etch server with kernel 2.6.18-amd64 and 6 GB RAM (xfsprogs
2.8.11-1).
My main concern is the amount of RAM I need for a fsck of the xfs fs.
Last time I search for the xfs requirements, I found the rule of
thumb: 2 GB RAM for 1 TB of disk storage + some RAM per x inodes.
Last year I deployed one server with a 4 TB xfs fs which is running
absolutely stable since then.
I don't want to creat _one_ big xfs fs, but I also don't want to end
up with 20-30 fs each with 4 TB of size. The question is, what is a
reasonable fs size with 4-6 GB of RAM? Will it be sufficient to add 15
GB of swap for a 10 TB fs? This will slow things certainly down, but
will it work?
Only few clients will access the data on this server. There will be 3
streams of data with ~17MB/s which the server should be able to
provide over GbE. Performance is not the primary goal. There will also
be a backup to tape (ok, _many_ tapes...).
Any thoughts or hints?
Ralf
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