On Wed, Sep 16, 2009 at 3:24 AM, Tino Schwarze <backuppc.li...@tisc.de>wrote:
> On Tue, Sep 15, 2009 at 03:12:28PM -0800, Chris Robertson wrote:
>
> > In short, it works for me.
>
> [...]
>
> Wow, thanks for sharing your experience. I figure that DRBD is a nice
> way to RAID-1 across multiple hosts for failover purposes. I didn't
> expect it to perform that well - I'll look into it for Samba/NFS backup
> server... (It nicely integrates with hearbeat BTW)
>
>
drdb (or AoE or iSCSI really) are great over local networks. latency is
usually pretty low and they are all low-overhead.
reading this post, he is just putting the xfs journal on drdb. All this
really does is save the disk heads for doing some seeks which will lower the
average latency of the drive somewhat because there is less travel(some
sites online say up to 30% write improvement but that was surely a special
workload). You could do this to a local drive also. Since this is just the
journal, the only concern here is having the system go down and losing the
journal device at the same time.
FYI, you can put the journal on a flash key as well as the journal doesnt
take that much space. the journal gets overwritten once the filesystem
confirms the write so you really only have to store as much data as the
filesystem has queue up to write. really a 1GB journal is way overkill but
a 1GB flash drive is cheap. Also, the journal doesnt have to be smoking
fast so a flashdrive that is readyboost capable(only a measurement of speed)
should be fine.
I think that you have to make the journal device during filesystem creation
but google might tell you that you can add an external journal later, im not
100% sure on this.
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