On Mon, Nov 17 2014 at 9:24am -0500, Leonardo Santos <heiligerstein@xxxxxxxxx> wrote: > I'm working in tests for my msc thesis envolving dm_cache module. I'm > having problems with the following scenario: > > Slowstorage: RAID1 (mdadm) with 4 HDDs; > - /dev/md/raid1_4ssds You mean /dev/md/raid1_4hdds ? > -- /dev/sda > -- /dev/sdb > -- /dev/sdc > -- /dev/sdd > > Faststorage: RAID1 (mdadm) with 4 SSDs > - /dev/md/raid1_4hdds And /dev/md/raid1_4ssds here? > -- /dev/sde > -- /dev/sdf > -- /dev/sdg > -- /dev/sdh > > > Cachestorage: dm_cache envolving both devices > - /dev/mapper/dmcache > -- /dev/md/raid1_4ssds > -- /dev/md/raid1_4hdds > > Other informations (strange facts): > In RAID0 it's working very well. > In a virtual machine (vbox) it's working as well (in this case disks have > 2GB only for big tests automatization, in production are 160GB SSDs and 2TB > HDDs); > > Have you seen about this error? Syslog is bellow. Never seen this before... have you taken care to zero the dm-cache metadata's superblock (first 512B of the cache metadata device) each time you've reconfigured the cache device? Have you tried using the latest lvm2 to create the dm-cache device? -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
