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Aligning partitions The first step is to align the partitions to 4K offsets. All this will be resolved when a consensus on the topic gets achieved, but until that happens hopefully soon , there is a set of easy workarounds, which I’ll describe here. Thanks for this clean and simple guide. I could put a bunch of instructions here, but Warren Block has a nice detailed walk-through of the actual commands used to partition disks with these standards. I’ve had this happen to me twice in the past.

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Fortunately its fairly straight forward to properly align your partitions during the install process. Last Updated January 21st, I’ve said it before: Reply Good advice Martijn, I was not aware of this!

In the future, if the replacement drive is a slightly different number of sectors, you have wiggle room. This link has a lot of useful hints, of which I’ll repeat some. The sector size changes create orthogonal problems. The byte logical reporting is a result of drive manufacturers’ attempt at backwards compatibility and thus confuses things.

Are these drives 4k drives? MBR-style partitions aka slices are expected to end on cylinder boundaries — that is, slices are measured in full cylinders. Maybe someone fixed it separately from you, but freebsr as I said: Yes, you can see that they report byte physical which is the indicator for this.

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Learn how your comment data is processed. The last time I tried in September, I think it silently adjusted the partition to cylinder boundaries, so I went and learned gpart instead.

Under Solaris ZFS would disable caching if “fed” a partition vs. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Its easy to do this before you start customizing the machine and installing things vs.

HOWTO: FreeBSD Partition Alignment for RAID, SSDs & 4k Disk Drives

I want create ZFS raidz from above 3 drives, and have the next questions:. Although in our case, we have the swap and the free space before the swap that we can wiggle as well, to result in a ZFS partition big enough to use as a replacement disk. The first step is to align the partitions to 4K offsets. Try them, like I did. Secondly, both fdisk and sysinstall force an incorrect partition alignment; you can not specify the correct alignment manually unless you choose an alignment which is a multiple of both 8 and 63, which are coprime, so a multiple of sectors.

Such margin would allow you to use other disk models of the “same” capacity. IMO, a better practice is to create a partition that’s a slightly smaller than the entire disk.

HOWTO – FreeBSD and 4k sector drives –

The problem is that current consumer-grade 4kB drives advertise B sectors and are indistinguishable from true B drives. The key here is the -a option for the UFS partition which specifies the alignment for both the beginning and end of the partition. In fact, if the drive adverties 4K sector size as “one true sector size”, both file systems will do fine by default, without any additional configuration.

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And as gravy on top of all this, disks lie about their sector size. Of course, fdisk and disklabel really should be fixed or evicted, gpart is currently the way to go. Start your first partition at the 1MB mark, and only create partitions that are even multiples of a megabyte. I want create ZFS raidz from above 3 drives, and have the next questions: FreeBSD 9 will use 4K fragments by default.

I could put a bunch of instructions here, but Warren Block has a nice detailed walk-through of the actual commands used to partition disks with these standards.

UFS formatting newfs reques only that the fragment size be set to I’d rather set it up the way that takes out the potential for guesswork out of the process in the future.

Here’s the thread at FreeBSD’s forums:. Note that you should definitely align the swap partition on a 4k boundary, since swap is moved around in chunks of the system page size which is on most systems see pagesize 1.

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