Hi Bob, Will, Tim, I also had some off-list comments on my irrelevant comments. So I will try to make this post less irrelevant, though my thoughts on this topic may be off the list discussion line of thoughts, as usual.
>From the major storage vendors I know, network storage systems as integrated products, are only offered with the same size/type of drives in a traditional RAID set (not the V-RAID style). Mixing different drives in a traditional RAID set is not recommanded by many vendors, and I think when taking that as a policy, it will cut off much trouble in trying to mix different drives in a RAID set. And folks, the last time I really got into the largest database (by Winter) data sets, their sizes were not really as huge as I thought. http://www.wintercorp.com/VLDB/2005_TopTen_Survey/TopTenProgram.html Again, I think, the exponential data growth we have been talking about for a few years is more in file data. Databases use block-storage, very efficient on capacity. The kind of drives is not as important as how do you use those drives. IMHO. Best, z ----- Original Message ----- From: "Bob Friesenhahn" <bfrie...@simple.dallas.tx.us> To: "Will Murnane" <will.murn...@gmail.com> Cc: <zfs-discuss@opensolaris.org> Sent: Sunday, January 18, 2009 2:30 PM Subject: Re: [zfs-discuss] replace same sized disk fails with too small error > On Sun, 18 Jan 2009, Will Murnane wrote: >> Most drives are sold with two significant digits in the size: 320 GB, >> 400 GB, 640GB, 1.0 TB, etc. I don't see this changing any time >> particularly soon; unless someone starts selling a 1.25 TB drive or >> something, two digits will suffice. Even then, this formula would >> give you 96% (1.2/1.25) of the disk's capacity. > > If the drive is attached to a RAID controller which steals part of its > capacity for its own purposes, how will you handle that? > > These stated drive sizes are just marketing terms and do not have a > sound technical basis. Don't drive vendors provide actual sizing > information in their specification sheets so that knowledgeable > people can purchase the right sized drive? > > Bob > ====================================== > Bob Friesenhahn > bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ > GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
