-ext3 to ext4 upgrade Was: HBase cluster on heterogeneous filesystems
Ted Yu 2012-03-12, 17:43
Is it possible to upgrade ext4 without losing existing data ?
On Fri, Nov 11, 2011 at 2:24 PM, Edward Capriolo <[EMAIL PROTECTED]>wrote:
> On Fri, Nov 11, 2011 at 4:42 PM, Otis Gospodnetic <
> [EMAIL PROTECTED]> wrote:
> > Hello,
> > I was wondering if anyone has done an experiment with HBase or HDFS/MR
> > where machines in the cluster have heterogeneous underlying file systems?
> > e.g.,
> > * 10 nodes with xfs
> > * 10 nodes with ext3
> > * 10 nodes with ext4
> > The goal being comparing performance of MapReduce jobs reading from and
> > writing to HBase (or just HDFS).
> > And does anyone have any reason to believe doing the above would be super
> > risky and cause data loss?
> > Thanks,
> > Otis
> > ----
> > Sematext :: http://sematext.com/ :: Solr - Lucene - Nutch
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> Since Hadoop abstracts you from the filesystem guts the underlying file
> system chosen can be mixed and matched. you can even mix and match the
> disks on a single machine.
> I have found that ext3 performance gets noticeably poor as disks gets full.
> I captured system vitals from a before and after ext3 to ext4 upgrade.
> Also if you want to get the most out of your disks read this:
> XFS should is usually described as on par or slightly better then ext4.
> However anecdotally most hardcore sysadmins I know can account for one XFS
> "i lost my super block" stories :)