Date: Wed, 20 Feb 2013 05:59:35 +0100 From: "bsd@todoo.biz" <bsd@todoo.biz> To: Liste FreeBSD <freebsd-questions@freebsd.org> Subject: Re: ZFS + iSCSI architecture Message-ID: <5A70C76B-4331-4BCA-82D3-3A6E6ADF7032@todoo.biz> In-Reply-To: <A1618B03-9CA6-46F9-89CA-7DB38B5D6ECA@my.gd> References: <93B2D1C4-8887-45F9-9939-A099AC5E3DA0@todoo.biz> <A1618B03-9CA6-46F9-89CA-7DB38B5D6ECA@my.gd>
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Le 20 f=E9vr. 2013 =E0 02:14, Fleuriot Damien <ml@my.gd> a =E9crit : >=20 > On Feb 19, 2013, at 11:20 PM, "bsd@todoo.biz" <bsd@todoo.biz> wrote: >=20 >> Hello, >>=20 >>=20 >> I am about to start deploying a large system (about 18 To which can = grow up to 36 To) based on a big Intel platform with lot's of fancy = features to have turbo boosted platform (ZIL on SSD + system on dongle = if I go for FreeNAS). Since I want to move on quite fast I might decide = to use FreeNAS in it's latest version.=20 >>=20 >>=20 >> The idea behind all that was to grant 5 or six critical servers = access to the NAS so that they can take advantage of :=20 >>=20 >> 1. space available on the NAS >>=20 >> 2. ability of the NAS to use ZFS and of clients to support this file = system (including snapshots)=20 >>=20 >> 3. Access the server using iSCSI (at least this is what I initially = planned).=20 >>=20 >> 4. Mount part of their filesystem using data stored on the SAN (like = /usr/local/ or other parts of the system).=20 >>=20 >>=20 >>=20 >> The server accessing the data will be of two types :=20 >>=20 >> 1. 2 x Ubuntu server 10.04 LTS=20 >>=20 >> 2. 4 x FreeBSD (mainly 8 and 9) with jail configured=20 >>=20 >>=20 >> I have started reading about iSCSI and potential problems with = FreeBSD.=20 >>=20 >=20 > What problems do you mean ? For example :=20 - Can my client (the initiator) directly mount a ZFS volume on freeBSD = using iSCSI or should I go back to formatting It to UFS ? - Is the iSCSI stack in FreeBSD stable an mature enough to be used in a = production environment ? =3D=3D> It is out of scope to have kernel panic because of an unstable = iSCSI related problem.=20 >=20 >> So my main questions would be :=20 >>=20 >>=20 >> =95 Should I go for iSCSI ?=20 >>=20 >=20 > Well in all use cases, iscsi should perform faster than NFS. Fast is good - stable is necessary in this case !=20 And this is what I am tring to evaluate=85=20 >=20 >> =95 Should I rather choose / prefer NFS ?=20 >>=20 >> =95 Should I export a Volume as UFS rather than ZFS (is ZFS supported = as a target) ? >>=20 >=20 > I'm not sure what you mean here, when you export a zvol over ISCSI: > - your SAN is the target and presents a block device (the zvol) > - your client is the initiator > - your client attaches to the ISCSI drive and formats it using = filesystem XYZ, be it ext3, ufs or ntfs >=20 Thanks for this reminder about vocabulary for iSCSI, I'll try to stick = to It ;-)=20 >=20 >>=20 >> The main idea is stability, redundancy of data and ease of = maintenance (in a headless FreeBSD / Linux world) before anything else !=20= >>=20 >=20 > ISCSI is a bit harder to setup IMO, however I think it''s more = reliable than NFS, what with its auto retries if it loses the network = link to a device. >=20 Have you deployed this in production and what are your concerns and = recommendations ?=20 >=20 >=20 >>=20 >>=20 >> That's the big pictures, if you have any pointers, advise, they are = all welcome.=20 >>=20 >>=20 >> It is quite late where I leave, so I will reply to posts in 8 to 10 = hours, but I hope to have enough answer(s) to start an interesting = thread (as I think this question is very interesting and not so clearly = explained (at least in my mind))=85=20 >>=20 >=20 > This is idd a very interesting topic and I hope to see more :) >=20 There is also an interesting (and fresh) post here :=20 = http://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSFreeBSDvsIllumos?showco= mments#comments >=20 >>=20 >> Thx very much for your infos and feedback.=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
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