[Xapian-discuss] Xapian across multiple servers
rtshilston at gmail.com
Fri Jul 25 10:05:24 BST 2008
On Thu, Jul 24, 2008 at 6:11 AM, Olly Betts <olly at survex.com> wrote:
> On Wed, Jul 23, 2008 at 03:27:08PM +0100, James Aylett wrote:
>> On Wed, Jul 23, 2008 at 04:08:12AM +0100, Olly Betts wrote:
>> > The NFS caching issue is rather relevant to admins, especially if the
>> > cache gets flushed even for the client modifying the database (as that
>> > would mean putting the database on NAS isn't good).
>> Does anyone have any knowledge of the serious NAS FSs in this respect?
>> I believe AFS provides partial updates, and it's possible you can do
>> similar things with SAM-FS (does that have a distributed version?).
> I don't know about specifics, but indeed this isn't an inherent
> limitation of the approach.
>> There are probably also tricks you can do on linux with block-level
>> replication out of DRBD.
> The "SAN" approach to remote storage should be much easier for the OS to
Maybe I've misunderstood something, but I'm not sure that SAN makes
any difference. SAN just moves the point at which the network is
NAS: Server-with-disks-in-running-a-filesystem -> network
SAN: disks -> server-running-filesystem -> network
Of course the diagram at
http://en.wikipedia.org/wiki/Image:SANvsNAS.svg is a lot better.
So, the problem of the clients sensibly caching is a property of the
network file system, not of the underlying architecture.
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