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Date: Sun, 22 Jul 2007 11:54:37 +0200 From: Tomasz Chmielewski <mangoo@...g.org> To: LKML <linux-kernel@...r.kernel.org> Cc: jengelh@...putergmbh.de Subject: Re: [DRIVER SUBMISSION] DRBD wants to go mainline Jan Engelhardt wrote > On Jul 22 2007 00:43, Lars Ellenberg wrote: >>Think of it as RAID1 over TCP. > > And what does it do better than raid1-over-NBD? (Which is already N-disk, > and, logically, seems to support cluster filesystems) I don't know about DRDB, but NBD doesn't handle network disconnections at all (well, almost). So basically, disconnect a NBD-connected system for a while (switch, cabling problem, operator error etc.), and you need lots of effort, perhaps restarts, to get the things to a functioning state (devices offlined, kicked out etc.). I wouldn't call such raid-over-NBD setup reliable. A better question would be: what does it do better than raid1-over-iSCSI? iSCSI can recover from disconnections very well when configured properly; but when a disconnection is in place, most of the system will just "hang/freeze" (that is, from the user perspective - the system will be waiting for the I/O to complete, until the systems are connected again). A brief reading of "official DRBD FAQ" didn't give me an answer to that problem. -- Tomasz Chmielewski http://wpkg.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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