What about FreeBSD with ZFS? I have no idea which features they support
and which not, but it at least is a bit more free than Solaris and still
offers that very nice file system.
Best regards,
Arjen
On 2-4-2010 21:15 Christiaan Willemsen wrote:
Hi there,
About a year ago we setup a machine with sixteen 15k disk spindles on
Solaris using ZFS. Now that Oracle has taken Sun, and is closing up
Solaris, we want to move away (we are more familiar with Linux anyway).
So the plan is to move to Linux and put the data on a SAN using iSCSI
(two or four network interfaces). This however leaves us with with 16
very nice disks dooing nothing. Sound like a wast of time. If we were to
use Solaris, ZFS would have a solution: use it as L2ARC. But there is no
Linux filesystem with those features (ZFS on fuse it not really an option).
So I was thinking: Why not make a big fat array using 14 disks (raid 1,
10 or 5), and make this a big and fast swap disk. Latency will be lower
than the SAN can provide, and throughput will also be better, and it
will relief the SAN from a lot of read iops.
So I could create a 1TB swap disk, and put it onto the OS next to the
64GB of memory. Then I can set Postgres to use more than the RAM size so
it will start swapping. It would appear to postgres that the complete
database will fit into memory. The question is: will this do any good?
And if so: what will happen?
Kind regards,
Christiaan
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