June 24, 2019 posted by

freebsd 4k

Disks themselves are moving from the long-standing B sector size to 4KB, eight times larger. And as gravy on top of all this, disks lie about their sector size. It also confers the following advantages: Previous Post Previous next book s: Sign up using Facebook. 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.

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How do you do this? Here is an example of the performance difference under FreeBSD 9. The described methods are “future proof” even if the drive, the controller, BIOS or the OS decide one day to ignore the byte advertisments and pronounce the drives as “pure 4K”. Are these drives 4k drives?

This article is a bit old but still validgoogle did show me this when I was dealing with my problem. Leave a Reply Cancel reply Your email address will not be published.

Freebs has no such issue. While not applicable to you, it lets you boot off ZFS and also have swap partitions i. Same procedures, like extract ports from tar, with regular drive, and on the same computer work flawlessly and very fast.

This is my attempt to rationalize and summarize a small cup of the flood of information I received.


4k hard drives freebsd gpart and zfs – Super User

We have had this deployed in dozens of production locations for many, many years. If everything falls in its place for me, I’ll freegsd rewrite both – there’s a need for interactive partitioning tools freevsd if it’s only psychological. With ZFS managing the whole drives, freebsdd set and ready to go. Announcing the arrival of Valued Associate Basically you have to pay attention what blocksize you use when zvol is created on zpool with 4K disks.

I recently installed and face following problem: Reply Good advice Martijn, I was not aware of this! 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 be able to use it.

If you write to the disk in B sectors, but the underlying disk has 4K sectors, the disk will perform many more writes than necessary. Thanks for this clean and simple guide. In fact, if the drive adverties 4K sector size as “one true sector size”, both file systems will do fine by default, freesbd any additional configuration. I’ve had this happen to me twice in the past.

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

The other advantage of this, is you leave the leftover fraction of a megabyte at the end of the drive. This can rfeebsd done by using gnop – a GEOM class which is used for testing and which normally does not produce permanent changes i. This link has a lot of useful hints, of which I’ll repeat some. Next, the pool needs to be exported and the gnop devices removed: This is something I didn’t know when I was creating zvols on zpool and I had to resync all the data due to the utilization.


The Good News Fortunately its fairly straight forward to properly align your partitions during the install process. With flash drives, SSDs, and whatever other sort of storage people come up with, disk geometry is increasingly obsolete. For each device which will be made a part of the pool, frewbsd gnop “chained” device needs to be created, and then those devices need to be added to a pool: Email Required, but never shown.

These instructions have been verified to work for FreeBSD 9. Try them, like I did. For best results, create all partitions aligned to a 4K sector. ZFS ZFS requires basically the same things like UFS, frreebsd the “zpool create” command cannot accept an argument telling it what the alignment should be ashift.

The byte logical reporting is a result of drive manufacturers’ attempt at backwards compatibility and thus confuses things.