On Tue, Jul 29, 2008 at 5:13 PM, Stefano Pini <[EMAIL PROTECTED]> wrote:
> Hi guys,
> we are proposing a customer a couple of X4500 (24 Tb) used as NAS (i.e.
> NFS server).
> Both server will contain the same files and should be accessed by different
> clients at the same time (i.e. they should be both active)
> So we need to guarantee that both x4500 contain the same files:
> We could simply copy the contents on both x4500 , which is an option
> because the "new files" are in a limited number and rate , but we would
> really like to use ZFS send & receive commands:
If they are truly limited, something like an rsync or similar. There was a
script being thrown around a while back that was touted as the Best Backup
Script That Doesn't Do Backups, but I can't find it. In essence, it just
created a list of what changed since the last backup and allowed you to use
tar/cpio/cp - whatever to do the backup.
>
>
> AFAIK the commands works fine but generally speaking are there any known
> limitations ?
> And, in detail , it is not clear if the receiving ZFS file system could be
> used regularly while it is in "receiving mode":
> in poor words is it possible to read and export in nfs, files from a ZFS
> file system while it is receiving update from another ZFS send ?
First, the zfs send works only on a snapshot. -i sends incremental
snapshots, so you would think that would work. From the zfs man page, you'll
see that during a receive, the destination file system is unmounted and
cannot be accessed during the receive.
If an incremental stream is received, then the destina-
tion file system must already exist, and its most recent
snapshot must match the incremental stream's source. The
destination file system and all of its child file sys-
tems are unmounted and cannot be accessed during the
receive operation.
>
> Clearly until the new updates are received and applied the old copy would
> be used
>
> TIA
> Stefano
>
>
>
> Sun Microsystems Spa
> Viale Fulvio testi 327
> 20162 Milano ITALY
> me *STEFANO PINI*
> Senior Technical Specialist at Sun Microsystems Italy <
> http://www.sun.com/italy>
> contact | [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> | +39 02
> 64152150
>
>
>
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