Messages in this thread | | | Date | Mon, 04 Jun 2012 22:59:29 +0400 | From | George Shuklin <> | Subject | Re: Why minor is still 8 bit? |
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On 04.06.2012 20:11, Casey Schaufler wrote: > On 6/3/2012 8:53 PM, George Shuklin wrote: >> On 04.06.2012 05:35, Al Viro wrote: >>> On Mon, Jun 04, 2012 at 05:25:01AM +0400, George Shuklin wrote: >>>> I've understand that major and minor numbers for device is 8-bit size. >>>> >>>> I've don't understand, WHY? In 2012! >>>> >>>> (I've just have some discussion about 8-bit counter limitations in >>>> context of cloud computing. In middle of 2012!!!!) >>> Yes, shocking. It's been several years and you are still using that >>> buzzword; I mean, it's _so_ 2010... Should've moved on to whatever's >>> in this year... >>> >>> Incidentally, minors are 20 bit and majors are 12, but don't let that >>> stand in the way of righteous indignation - what's mere facts when >>> one is having discussions in context, presumably leveraging synergies >>> all along... >> Ok, thank you for information. >> >> But question is almost same: can I have 30k active logical volumes on >> my single server, please? > What are you trying to do, create a logical volume for every file? > There are at least three separate technologies available that will > solve whatever your problem is better than having 30,000 logical > volumes. I don't have a clue what you think you're trying to > accomplish and I am still willing to bet beers that you're bus is > parked solidly on the wrong tracks. > > Very simple sample: I'd like to create shared storage to publish volumes via ISCSI. ~60Tb of drives, ~2Gb average disk size = 30k disk images. Can I just create a bunch of LV and export them by iet or scst? Nope: There is a serious limit for amount of active LV per host. Yes, I can create filesystem, put images (as file) to that filesystem and publish them back, but why FS is needed to do such simple task?
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