Richard, thank you so very much! This is the kind of answer I expected from Sun Storage. I will do more studies before I speak again. Happy holidays!!! z
----- Original Message ----- From: "Richard Elling" <[EMAIL PROTECTED]> To: "Joseph Zhou" <[EMAIL PROTECTED]> Cc: "William D. Hathaway" <[EMAIL PROTECTED]>; <zfs-discuss@opensolaris.org>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Sunday, December 07, 2008 12:57 AM Subject: Re: [zfs-discuss] Hardware Raid Vs ZFS implementation on SunX4150/X4450 > Joseph Zhou wrote: >> Yeah? >> http://www.adaptec.com/en-US/products/Controllers/Hardware/sas/value/SAS-31605/_details/Series3_FAQs.htm >> Snapshot is a big deal? >> > > Snapshot is a big deal, but you will find most "hardware" RAID > implementations > are somewhat limited, as the above adaptec only supports 4 snapshots and > it is an > optional feature. You will find many array vendors will be happy to > charge lots > of money for the snapshot feature. > >> Windows OS does that too. >> > > Not the Windows OS I run on my laptop. But the feature seems to be best > integrated > on Max OSX. > >> Compression -- where is the performance data showing compression in >> OpenSolaris has little overhead? >> > > If you search these archives you will find instances where compression > performance is much faster than not, and you will find instances where > compression has significant overhead. YMMV. As with most things, > there are engineering and design trade-offs that you should consider. > >> Clones -- tell me the benefit of Clone when we have point-in-time copies >> with continuous, policy-based protection? And snapshot images are mostly >> writable and sync-able today? >> > > In ZFS, snapshots are read-only. Clones are created from a snapshot > and can be writable. We use clones extensively for OS upgrading and > patching. For example, when you upgrade OpenSolaris, we clone the > OS file systems and upgrade the clone, so that you can move forward > or roll back to different versions. Many people use clones for virtual > machines. > >> Man, I am an open storage analyst, please, tell me I am wrong!!!!! >> > > I suggest you read the docs, particularly the ZFS Administration Guide. > http://www.opensolaris.org/os/community/zfs/docs > -- richard >> zStorageAnalyst >> >> ----- Original Message ----- >> From: "William D. Hathaway" <[EMAIL PROTECTED]> >> To: <zfs-discuss@opensolaris.org> >> Sent: Saturday, December 06, 2008 11:41 PM >> Subject: Re: [zfs-discuss] Hardware Raid Vs ZFS implementation on Sun >> X4150/X4450 >> >> >> >>> I don't understand your statement/questions. This wasn't a response to >>> "ZFS versus every possible storage platform in the world". The original >>> poster was asking about comparing ZFS versus hardware RAID on specific >>> machines as mentioned in the title. AFAIK you don't get compression, >>> snapshots and clones with standard hardware RAID cards. >>> -- >>> This message posted from opensolaris.org >>> _______________________________________________ >>> zfs-discuss mailing list >>> zfs-discuss@opensolaris.org >>> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> >> _______________________________________________ >> zfs-discuss mailing list >> zfs-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
