On Thu, Apr 01, 2021 at 11:20:44AM +0300, Lev Serebryakov wrote: | On 01.04.2021 2:39, Doug Ambrisko wrote: | | > | > I can only state that I use it only occasionally, and that when I do. I | > | > have had no problems with it. I'm glad that it's there when I need it. | > | | > | Thanks for the reply. Can you comment on your use cases - in | > | particular, did you use mirror, stripe, or raid5? If the first two | > | then gmirror, gconcat, gstripe, and/or graid are suitable | > | replacements. | > | | > | I'm not looking to deprecate it just because it's old, but because of | > | a mismatch between user and developer expectations about its | > | stability. | > | > It would be nice if graid got full support for RAID5 alteast I'm not sure | > how much the others are used for that are not fully supported (RAID4, | > RAID5, RAID5E, RAID5EE, RAID5R, RAID6, RAIDMDF) according to the man | > page. I started to hack in RAID5 full support and try to avoid writes | > if members didn't change. This limits our VROC support. | My experience, as co-author and maintainer of `sysutil/graid5`, | shows, that it is very non-trivial task. It contains many subtle | problems. | | `graid5` still has some undiscovered problems, and I don't think it | worth fixing in 2021, when we have ZFS for many years.
The only advantage I see of graid supporting raid5 would be better support for VROC and people like RAID5. I don't like RAID5 for SSD's since it adds to write amplification issues but people like it. RAID5 had terrible write performance in Linux with concurrent I/O. I wanted to see if FreeBSD could do better. Intel seems to be pushing VMD since we recently had a FreeBSD user need newer VMD support since they couldn't turn it off in the BIOS. VMware doesn't support VROC. We support it a bit in that VMD allows graid to access the drives and deals with the Intel meta data. It doesn't read the info. from the EFI runtime. So in RAID 0, 1 and 10 should work. It would be nice if someone could install FreeBSD on working Linux config. No-one has asked for it so it doesn't seem very important. Thanks, Doug A. _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
