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Re: Debian 8.2 RAID conf. problem

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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-

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Debian 8.2 RAID conf. problem erdal daghan <erdaldaghan@gmail.com> - 2015-10-21 18:30 +0200
  Re: Debian 8.2 RAID conf. problem Mario Castelán Castro  <marioxcc.MT@yandex.com> - 2015-10-21 18:40 +0200
    Re: Debian 8.2 RAID conf. problem Tony van der Hoff <tony@vanderhoff.org> - 2015-10-21 18:50 +0200
      Re: Debian 8.2 RAID conf. problem Darac Marjal <mailinglist@darac.org.uk> - 2015-10-22 10:50 +0200
      Re: Debian 8.2 RAID conf. problem Dan Ritter <dsr@randomstring.org> - 2015-10-22 19:00 +0200
    Re: Debian 8.2 RAID conf. problem Pascal Hambourg <pascal@plouf.fr.eu.org> - 2015-10-21 21:20 +0200
    Re: Debian 8.2 RAID conf. problem Cindy-Sue Causey <butterflybytes@gmail.com> - 2015-10-22 16:30 +0200
      Re: Debian 8.2 RAID conf. problem Pascal Hambourg <pascal@plouf.fr.eu.org> - 2015-10-22 21:30 +0200
        Re: Debian 8.2 RAID conf. problem Curt <curty@free.fr> - 2015-10-23 11:00 +0200
          Re: Debian 8.2 RAID conf. problem Chris Bannister <cbannister@slingshot.co.nz> - 2015-10-23 13:50 +0200
            Re: Debian 8.2 RAID conf. problem Lisi Reisz <lisi.reisz@gmail.com> - 2015-10-23 18:50 +0200
              Re: Debian 8.2 RAID conf. problem John Hasler <jhasler@newsguy.com> - 2015-10-23 19:00 +0200
                Re: Debian 8.2 RAID conf. problem Curt <curty@free.fr> - 2015-10-23 19:30 +0200
              Re: Debian 8.2 RAID conf. problem Curt <curty@free.fr> - 2015-10-23 19:00 +0200

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