Date: Wed, 16 Feb 2005 17:00:41 -0600 From: Eric Anderson <anderson@centtech.com> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: newfs limits? 10TB filesystem max? Message-ID: <4213D099.3020504@centtech.com> In-Reply-To: <20050216225528.GB2787@odin.ac.hmc.edu> References: <20050216215325.9201.qmail@web26805.mail.ukl.yahoo.com> <4213C1FB.6030802@centtech.com> <20050216225528.GB2787@odin.ac.hmc.edu>
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Brooks Davis wrote: > On Wed, Feb 16, 2005 at 03:58:19PM -0600, Eric Anderson wrote: > >>Claus Guttesen wrote: >> >>>>I've just built an enormous 10TB filesystem. When >>>>trying to newfs the disk, it bombed with something >>>>like "cannot allocate memory" after something like >>>>23xxxxxxxxx sectors.. I noticed disklabel complains >>>>about disks with more than 2^32-1 sectors not being >>>>supported.. >>> >>> >>>Aren't you supposed to use gpt(8) to define partitions >>>larger than 2 TB? >> >>No idea - this is the first I've heard of gpt really.. >> >> >> >>>>Is newfs supposed to be able to work? I've used the >>>>-s option to newfs to limit my filesystem size to >>>>the max it would allow, which ends up being >>>>11350482546 1K blocks, which means I'm only losing a >>>>couple GB, which is no sweat right now for me, but >>>>if someone wanted a 20TB filesystem, they'd be >>>>hosed. >>> >>> >>>Then the question is whether newfs reads >>>gpt-partitioned disks? From newfs(8): >>> >>>Before running newfs the disk must be labeled using >>>bsdlabel(8). >>> >>>How did you create such a huge partition? Your >>>question is quite interesting, I'm at a >>>storage-solution which supports LUN's larger than 2.2 >>>TB. >> >>I used vinum to stripe 6 2TB partitions connected to 2 fiber channel disk >>arrays. Vinum automatically does the bsdlabel part. I was merely wanting >>to see what bsdlabel had to say about the vinum disk (if anything). >> >>Using newfs on it worked as long as I specified a smaller sector count. > > > bsdlabels are for the most part unable to access more then 2TB of > storage. You should either newfs the disk directly or use gpt. If > vinum is creating a bsdlabel, the label is almost certaintly bogus if > the disk is larger than 2TB. There is an exception if the disk has > sectors larger than 512K, but those are fairly rare. Hmm - well, it works.. :) Is there something I should be aware of that I'm not seeing? If anyone is interested in any stats, or other info, please let me know. I can provide any details if anyone is curious.. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology I have seen the future and it is just like the present, only longer. ------------------------------------------------------------------------
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