[zfs-discuss] Very poor small-block random write performance

I have an 8 drive ZFS array (RAIDZ2 - 1 Spare) using 5900rpm 2TB SATA drives with an hpt27xx controller under FreeBSD 10 (but I've seen the same issue with FreeBSD 9). The system has 8gigs and I'm letting FreeBSD auto-size the ARC. Running iozone (from ports), everything is fine for file sizes

[zfs-discuss] Question on 4k sectors

Hi. Is the problem with ZFS supporting 4k sectors or is the problem mixing 512 byte and 4k sector disks in one pool, or something else? I have seen alot of discussion on the 4k issue but I haven't understood what the actual problem ZFS has with 4k sectors is. It's getting harder and harder to find

Re: [zfs-discuss] Has anyone switched from IR -> IT firmware on the fly ? (existing zpool on LSI 9211-8i)

Here's a better link below. I have seen enough bad things happen to pool devices when hardware is changed or firmware is updated to recommend that the pool is exported first, even an HBA firmware update. Either shutting the system down (where pool is hosted) or exporting the pool should do it.