With ZFS managing the whole drives, you’re set and ready to go. This link has a lot of useful hints, of which I’ll repeat some. For best results, create all partitions aligned to a 4K sector. Depends on your work load. The gnop command creates a forced 4k-alignment passthrough device for ada0 as ada0.
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With ZFS managing the whole drives, you’re set and ready to go. Traditional disks have a geometry defined by cylinders, heads, and sectors. UFS formatting newfs reques only that the fragment size be set to As I see it, fdisk accepted a partition starting in sector 64, i. Continue through the rest of the install as 4i normally would do.
Are those 4k drives? The other advantage of this, is you leave the leftover fraction of a megabyte at the end of the drive. All this will be resolved when a consensus on the topic gets achieved, but until frwebsd happens hopefully soonfreesd is a set of easy workarounds, which I’ll describe here. From your “throw the switch” phrase it looks like you are rreebsd of simply pronouncing the drives as “pure” 4K drives i. Such margin would allow you to use other disk models of the “same” capacity.
Reply Thanks mate — you saved my day. Last Updated January 21st, Aligning partitions The first step is to align the partitions to 4K offsets. The last time I ffeebsd in September, I think it silently adjusted the partition to cylinder boundaries, so I went and learned gpart instead.
The changes are freebed, of course, irreversible. This will basically ensure most of the IO is done in 4K offsets. Skip to content A couple weeks ago, I monopolized the freebsd-hackers mailing list by asking a couple simple, innocent questions about managing disks using gpart 8 instead of the classic fdisk 8 and disklabel 8.
In your situation I would use the following commands to gpart out the disk:. Start the FreeBSD install process as normal. Note that you should definitely align the swap partition on a 4k boundary, since swap is moved around in chunks of the system treebsd size which is on most systems see pagesize 1.
Start your first partition at the 1MB mark, and only create partitions that are even multiples of a megabyte. Does this mean that installing FreeBSD 8.
Ok, please examine this script session: Each vdev like a mirror or raidz has a single ashift. Although in our case, we have the swap and the free space before the swap that we can fteebsd as well, to result in a ZFS partition big enough to use as a replacement disk.
Sign up using Facebook. Planned maintenance scheduled April 23, at I recently opened a FreeNAS 8. For GPT partitions, you must start partitioning the disk at a multiple of 4K. By giving ZFS the entire drive, you’re also accepting the risk that if in the future you’ll need to replace the drive that failed and the replacement you’ll buy has even one sector fewer than the old disk, you won’t greebsd able to use it. No special partitioning required. This works freebzd ZFS writes the ashift value in its metadata.
Same procedures, like extract ports from tar, with regular drive, and on the same computer work flawlessly and very fast. This avoids a situation where you replace a drive with a different vendor and it ends up being ever-so-slightly smaller and thus unusable. Depends on your work load. If you want the 2nd partition the 1st is the boot code to start at 1mb, and be a multiple of 1mb, you can just use -a 1m.