All of that is moot if you're keeping offline backups (and maybe even
offsite backups? Right? Right?), as the backup ensures that even if the
original system becomes completely unavailable, you still have your
applications and data.
On Thu, Jun 14, 2018 at 1:37 AM, Csaba Toth <csaba.toth...@gmail.com> wrote:
My definition of the vendor lock-in is the same. Controller failure is much
less common than than disk failure, but when it happens it can be bad. In
such case moving off the data may not be easy, the controller knew how it
calculated and stored the parity. It's not a rocket science and it can be
forensically determined I guess, but that may require non trivial effort.
I've heard of a PACS system where the controller failure was forgotten out
of the contract (between the hospital and the vendor), but it happened and
it was NOT pretty.
With LVM it's all software, so you don't even have to move the data off, if
you find any controller with JBOD capability which can show the disks again
to the system.
I also often come across systems which 10+ years old, still running fine,
but the controllers become my first thought in my mind. The best if you
have some spare one. Still SATA, but yes, PATA for example is getting
really outdated.
On Mon, Jun 11, 2018, 9:46 AM Tilghman Lesher <tilgh...@meg.abyt.es> wrote:
When I think of vendor lock-in, I generally think of the inability to move
data off of one system. I don't think that's really much of a concern, at
least if you're working with business systems, and your hardware is not
more than a few years old. As the disks tend to fail more often than the
controller, how you formatted and managed the disks isn't likely to be the
main issue.
The bigger issue that you're going to encounter is a change in hardware
specification. Imagine that you have a storage room full of IDE disks, and
you needed to get information off of them, when today, the prevailing
standard is SATA. Or, if you're into tape backups, imagine a room full of
backup tapes and being unable to find a working drive that takes that
specific tape.
On Sat, Jun 9, 2018 at 12:54 AM, Csaba Toth <csaba.toth...@gmail.com> wrote:
True. LVM is not remotely equivalent, but can be utilized towards use cases
of disk arrays. A well versed RAID controller makes it easy to set up a
RAID 50 for example but as you experienced, they can age and things can go
wrong. Some of them are true hardware RAID, like lats time I dealt with an
AMCC which has PowerPC CPU on board to perform the parity computations and
related stuff. But for today's CPUs that's not much. If you have enough
spare cards that can be enough fine.
One thing I also learned long time ago: make sure to have a BBU and that
the BBU battery is charged & functional, otherwise you can be impacted by a
significant speed hit because the card won't cache as much / caches
differently for data integrity reasons.
On Fri, Jun 8, 2018 at 6:53 PM, Chris McQuistion
<chris.mcquist...@gmail.com> wrote:
I don’t think of Linux software RAID as the same as LVM but yes I would
prefer Linux software RAID over hardware RAID because the performance is
very good and the array is portable. I had a hardware RAID card die on me,
many years ago, and it made me realize that I was dependent on that single
piece of hardware that the manufacturer (Adaptec) had long since discontinued.
Sent from my iPhone
On Jun 8, 2018, at 7:54 PM, Csaba Toth <csaba.toth...@gmail.com> wrote:
Would you favor LVM over "hardware" (quote is half intentional)? My twin
brother's advice is that this way I can avoid vendor lock-in. And if
something goes south I can still migrate to anything which provides JBOD.
On Fri, Jun 8, 2018 at 8:00 AM, Chris McQuistion
<chris.mcquist...@curreyingram.org> wrote:
and if you "watch cat /proc/mdstat", you can watch the progress as your
RAID array is built or re-built.
Chris McQuistion
Director of Information Technology
Currey Ingram Academy
6544 Murray Lane, Brentwood, TN, 37027
o615.507.3175c615.525.5877
www.curreyingram.org
On Fri, Jun 8, 2018 at 9:58 AM Howard White <hwh...@vcch.com> wrote:
Currently messing about with a software raid (md). Found a nice how-to
<https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04>
that included a couple of generally useful commands:
lsblk -o NAME,SIZE,FSTYPE,MOUNTPOINT
and
cat /prod/mdstat
Enjoy.
Howard
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