From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heinz-Josef Claes Subject: Re: Reiserfs with Samba vs NetApp Filer Date: 12 Oct 2002 16:34:34 +0200 Message-ID: <1034433275.1266.14.camel@kakapo> References: <001b01c26fff$26d23850$0101a8c0@bummer> <20021010165854.4381ed7e.philippe.gramoulle@mmania.com> <3DA5B971.3040400@namesys.com> <20021010195338.138dffcf.philippe.gramoulle@mmania.com> <20021011104041.GC29452@marowsky-bree.de> <20021011125412.2fe02af7.philippe.gramoulle@mmania.com> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <20021011125412.2fe02af7.philippe.gramoulle@mmania.com> List-Id: Content-Type: text/plain; charset="iso-8859-1" To: reiserfs-list@namesys.com Cc: teodarren@myrealbox.com Am Fre, 2002-10-11 um 12.54 schrieb Philippe Gramoull=E9: >=20 > Hi, >=20 > On Fri, 11 Oct 2002 12:40:41 +0200 > Lars Marowsky-Bree wrote: >=20 > | On 2002-10-10T19:53:38, > | Philippe Gramoull=E9 said: > | =20 > | > Yes, that's what i meant by "not *out of the box* snapshots". > | =20 > | Well, LVM functionality comes out of the box with all modern distrib= utions. >=20 > Ok let me rephrase it: First i didn't want to start a thread on pros/cons= of LVM. >=20 > And i only wanted to say that LVM (though part of all modern distribution= s) doesn't > come installed out of the box,at least not on Debain , which we use mainl= y. > Whereas snapshots on Netapp comes out of the box with DATAONTAP. >=20 > But LVM is there of course if one needs snapshot functionnality. >=20 Some years ago I was responsible for buying some filers for a very critical environment (a dealing room), so I got some experiences (also with errors). The snapshot functionnality of the filers makes a snapshot on the block layer on a big filesystem in a minute or so. The mainly needed overhead are the used blocks between the snapshot (or after the snapshot). This is not comparable to a snapshot of EMC, which is simply a copy of the hole disk to another one (with RAID under it and so on ...). Is LVM comparable to netapp or to EMC snapshot? I was very impressed by the netapp snapshot because you can make a snapshot very fast (mainly the inodes are copied) and also online during the day (which we did). The users could themselfes restore there data via normal filesystem operations. We had nearly no need anymore to restore data from tapes. (This was the reason why I wrote storeBackup, a simple tool which has some disadvantages and also some advantages compared to a filer.) Hope this clearyfies the functionality of the Netapp snapshot, which I think is patented! --=20 Heinz-Josef Claes hjclaes@web.de project: http://sourceforge.net/projects/storebackup -> snapshot-like backup to another disk