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
