On Wed, Oct 21, 2015 at 05:46:55PM +0100, Tony van der Hoff wrote: > On 21/10/15 17:35, Mario Castelán Castro wrote: > >El 21/10/15 a las 11:11, erdal daghan escribió: > >>Hi, > >> > >>I have a problem with install debian. When I trying to install the Debian > >>8.2 with RAID1 configuration it does NOT add bootable flag in guided > >>partitioning mode. It Doesn't on option. > > > >The problem seems to be your perception, not Debian. Why do you think > >you need that flag?. As far as I know, GRUB ignores it, so it makes no > >difference regarding booting the system. Also, if you use guided > >partitioning, you can manually adjust the suggested partitioning scheme > >before proceeding, so if you really need it, you can easily toggle it. > > > >El 21/10/15 a las 11:11, erdal daghan escribió: > >>Please help me.. I have two ssd disks(240gb). I want to make RAID1 > >>configuration. > > > >You probably refer to ordinary solid state drives which are NOT disks. > > > > This raises a question in my mind: Should SSDs be used in RAID arrays?
As always, it depends on what you want to do. RAID1 is done as a mechanism to give you a window between disk failure and the need to replace the disk. Using identical SSDs might not be a good strategy here, because identical write patterns might produce identical failures. I would consider something that keeps the secondary disk less used than the primary - for instance, rsyncing primary to secondary every so often. Once a day at minimum, once every 30 minutes or so max. On the other hand, a database server might make good use of a RAID10 of two kinds of similar but not identical disks - a disk controller on a PCIe x8 slot can be saturated by 16 SATA3 SSDs all running full-out. Or you might want to use SSDs as caches for large spinning disks. Generically, you can do this with bcache; if you use ZFS, ZIL and L2ARC are what you are looking for. -dsr-