It'll be simpler/more efficient to raid1 the SSDs and run bcache on top of the raid1s
On Tue, Feb 5, 2013 at 8:24 AM, Giovanni Lenzi <[email protected]> wrote: > I'm going to put bcache in write-back mode .. > > > ---------- Forwarded message ---------- > From: Giovanni Lenzi <[email protected]> > Date: 5 February 2013 09:57 > Subject: Fwd: is the fail-over of two bcached volumes in raid 1 really > possible? > To: [email protected] > > > Hi all, > I'm planning to use bcache in a production environment. > > For failover purposes, I would like to have two cached hard disk in > raid 1 via md or dm. > > ssd1 caching physical hd1(1 or 2 tb) > and > ssd2 caching physical hd2(1 or 2 tb) > > Is it possible to raid over bcached volumes? > > Do you know if SSD or HD failures are correctly handled by software > layers above the physical volumes and does not cause disruptive > behaviour even in a raid 1 situation? > > Is there a way to know if one bcache volume in the raid is failing or > failed, through something like kernel, bcache or raid logs? > > I want to put some monitoring tool like nagios on my machine, in order > to be notified of all strange events on my volumes. > > Do you think raid1 will affect performance? > > I will try this configuration as soon as my ssd will arrive. > > In case I begin with 1 tb hard disks and would like to switch to 2tb > hard disks in the future, I would like to know if is it possible to > extend these mirrored cached volumes on the fly and WITHOUT DOWN > TIMES? > > Thanks in advance > -- > Giovanni > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
