Re: iowait - ext4 + ssd journal

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On Mon, 3 Nov 2014 at 5:37pm, Lindsay Mathieson wrote

On 4 November 2014 11:28, Paul Robert Marino <prmarino1@xxxxxxxxx> wrote:
Use XFS instead of EXT4
There are many very good reasons its the new default filesystem in RHEL 7

xfs can't use a external journal.

Actually, it can. I remember playing with it *way* back in the day when XFS was first ported to Linux. From 'man mkfs.xfs':

       The  metadata  log can be placed on another device to reduce the number
       of disk seeks.  To create a filesystem on the first  partition  on  the
       first  SCSI  disk with a 10000 block log located on the first partition
       on the second SCSI disk, use:

              mkfs.xfs -l logdev=/dev/sdb1,size=10000b /dev/sda1


--
Joshua Baker-LePain
QB3 Shared Cluster Sysadmin
UCSF
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