Always a good point. There is NO REPLACEMENT for proper backups! *Chris McQuistion*
Director of Information Technology Currey Ingram Academy 6544 Murray Lane, Brentwood, TN, 37027 *o* 615.507.3175 *c* 615.525.5877 www.curreyingram.org On Thu, Jun 14, 2018 at 9:14 AM Tilghman Lesher <[email protected]> wrote: > 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 <[email protected]> > 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 really outdated.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 <[email protected]> >> 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 <[email protected]> >>> 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 < >>>> [email protected]> 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 <[email protected]> >>>>> 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 < >>>>> [email protected]> 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 >>>>>> <https://maps.google.com/?q=6544+Murray+Lane,+Brentwood,+TN,+37027&entry=gmail&source=g> >>>>>> >>>>>> >>>>>> *o* 615.507.3175 *c* 615.525.5877 >>>>>> >>>>>> www.curreyingram.org >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Fri, Jun 8, 2018 at 9:58 AM Howard White <[email protected]> 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 >>>>>>> >>>>>>> -- >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "NLUG" group. >>>>>>> To post to this group, send email to [email protected] >>>>>>> To unsubscribe from this group, send email to >>>>>>> [email protected] >>>>>>> For more options, visit this group at >>>>>>> http://groups.google.com/group/nlug-talk?hl=en >>>>>>> >>>>>>> --- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "NLUG" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>> >>>>>> -- >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "NLUG" group. >>>>>> To post to this group, send email to [email protected] >>>>>> To unsubscribe from this group, send email to >>>>>> [email protected] >>>>>> For more options, visit this group at >>>>>> http://groups.google.com/group/nlug-talk?hl=en >>>>>> >>>>>> --- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "NLUG" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> -- >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "NLUG" group. >>>>> To post to this group, send email to [email protected] >>>>> To unsubscribe from this group, send email to >>>>> [email protected] >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/nlug-talk?hl=en >>>>> >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "NLUG" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>>> -- >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "NLUG" group. >>>>> To post to this group, send email to [email protected] >>>>> To unsubscribe from this group, send email to >>>>> [email protected] >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/nlug-talk?hl=en >>>>> >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "NLUG" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "NLUG" group. >>>> To post to this group, send email to [email protected] >>>> To unsubscribe from this group, send email to >>>> [email protected] >>>> For more options, visit this group at >>>> http://groups.google.com/group/nlug-talk?hl=en >>>> >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "NLUG" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> Tilghman >>> >>> -- >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "NLUG" group. >>> To post to this group, send email to [email protected] >>> To unsubscribe from this group, send email to >>> [email protected] >>> For more options, visit this group at >>> http://groups.google.com/group/nlug-talk?hl=en >>> >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "NLUG" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> -- >> You received this message because you are subscribed to the Google Groups >> "NLUG" group. >> To post to this group, send email to [email protected] >> To unsubscribe from this group, send email to >> [email protected] >> For more options, visit this group at >> http://groups.google.com/group/nlug-talk?hl=en >> >> --- >> You received this message because you are subscribed to the Google Groups >> "NLUG" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Tilghman > > -- > -- > You received this message because you are subscribed to the Google Groups > "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/nlug-talk?hl=en > > --- > You received this message because you are subscribed to the Google Groups > "NLUG" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- You received this message because you are subscribed to the Google Groups "NLUG" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nlug-talk?hl=en --- You received this message because you are subscribed to the Google Groups "NLUG" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
