Date: Fri, 17 May 2013 20:03:30 -0400 From: Paul Kraus <paul@kraus-haus.org> To: "bsd@todoo.biz" <bsd@todoo.biz> Cc: Liste FreeBSD <freebsd-questions@freebsd.org> Subject: Re: ZFS install on a partition Message-ID: <5FB78660-EDA4-40DB-8A0D-B0DE23A0FB6C@kraus-haus.org> In-Reply-To: <F744BBF1-D98C-47BF-9546-14D1A9CB3733@todoo.biz> References: <F744BBF1-D98C-47BF-9546-14D1A9CB3733@todoo.biz>
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On May 17, 2013, at 6:24 PM, "bsd@todoo.biz" <bsd@todoo.biz> wrote: > I know I should install a system using HBA and JBOD configuration - = but unfortunately this is not an option for this server.=20 I ran many ZFS pools on top of hardware raid units, because that is what = we had. It works fine and the NVRAM write cache of the better hardware = raid systems give you a performance boost. > What would you advise ?=20 >=20 > 1. Can I use an existing partition and setup ZFS on this partition = using a standard Zpool (no RAID).=20 Sure. Be careful when you say RAID=85 I assume you mean RAIDz<n> = configured top level vdevs. Remember, a mirror is RAID-1 and the base = ZFS striping is considered RAID-0. So set it up as plain stripe of one = vdev :-) > 2. Should I use any other solution in order to setup this (like full = ZFS install on disk using the entire pool with ZFS).=20 If the system is configured with existing LUNS use them. > 3. Should I avoid using ZFS since my system is not well tuned and It = would be asking for trouble to use ZFS in these conditions.=20 No. One of the biggest benefits of ZFS is the end to end data integrity. = IF there is a silent fault in the HW RAID (it happens), ZFS will detect = the corrupt data and note it. If you had a mirror or other redundant = device, ZFS would then read the data from the *other* copy and rewrite = the bad block (or mark that physical block bad and use another). > P.S. Stability is a must for this system - so I won't die if you = answer "3" and tell me to keep on using UFS.=20 ZFS is stable, it is NOT as tuned as UFS just due to age. UFS in all of = it's various incarnations has been tuned far more than any filesystem = has any right to be. I spent many years managing Solaris system and I = was truly amazed at how tuned the Solaris version of UFS was. I have been running a number of 9.0 and 9.1 servers in production, all = running ZFS for both OS and data, with no FS related issues. >=20 >=20 > Thanks.=20 >=20 >=20 > ________________________________________________ > =AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB= ?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7 > =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF= =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF > BSD - BSD - BSD - BSD - BSD - BSD - BSD - BSD - > ________________________________________________ > =AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB= ?=BB=A7=AB?=BB=A5=AB?=BB=A7=AB?=BB=A5=AB?=BB=A7 > =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF= =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF > PGP ID --> 0x1BA3C2FD >=20 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to = "freebsd-questions-unsubscribe@freebsd.org" -- Paul Kraus Deputy Technical Director, LoneStarCon 3 Sound Coordinator, Schenectady Light Opera Company
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