Re: [zfs-discuss] ZFS for write-only media?

Dana H. Myers [EMAIL PROTECTED] wrote: Bob Friesenhahn wrote: Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. I'm just going to

Re: [zfs-discuss] ZFS for write-only media?

Joerg Schilling schrieb: WOM Write-only media http://www.national.com/rap/files/datasheet.pdf Daniel ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

Re: [zfs-discuss] ZFS for write-only media?

On Thu, 24 Apr 2008, Daniel Rock wrote: Joerg Schilling schrieb: WOM Write-only media http://www.national.com/rap/files/datasheet.pdf I love this part of the specification: Cooling The 25120 is easily cooled by employment of a six-foot fan, 1/2 from the package. If

Re: [zfs-discuss] ZFS for write-only media?

Richard L. Hamilton [EMAIL PROTECTED] wrote: I know two write-only device types: WOM Write-only media WORNWrite-once read never (this one is often used for backups ;-) Jörg Save $$ (or ??) - use /dev/null instead. See:

Re: [zfs-discuss] ZFS for write-only media?

Dana H. Myers [EMAIL PROTECTED] wrote: Bob Friesenhahn wrote: Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. I'm just going to assume that

Re: [zfs-discuss] ZFS for write-only media?

Bob Friesenhahn [EMAIL PROTECTED] wrote: On Mon, 21 Apr 2008, Dana H. Myers wrote: Bob Friesenhahn wrote: Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term

Re: [zfs-discuss] ZFS for write-only media?

21.04.2008 um 23:18 schrieb [EMAIL PROTECTED]: Date: Mon, 21 Apr 2008 14:20:15 -0500 (CDT) From: Bob Friesenhahn [EMAIL PROTECTED] Subject: [zfs-discuss] ZFS for write-only media? To: zfs-discuss@opensolaris.org Message-ID: [EMAIL PROTECTED] Content-Type: TEXT/PLAIN; charset=US-ASCII

Re: [zfs-discuss] ZFS for write-only media?

On Tue, 22 Apr 2008, Ralf Bertling wrote: Hi Bob, If I was willing to do that I would simply build a pool from file- based storage being n-ISO images. It would involve the following steps 1. create blank ISO images of the size of your media 2. zpool create wormyz raidz2 image1.iso

Re: [zfs-discuss] ZFS for write-only media?

Bob Friesenhahn wrote: The problem here is that by putting the data away from your machine, you loose the chance to scrub it on a regular basis, i.e. there is always the risk of silent corruption. Running a scrub is pointless since the media is not writeable. :-) But that's the

Re: [zfs-discuss] ZFS for write-only media?

On Tue, 22 Apr 2008, Jonathan Loran wrote: But that's the point. You can't correct silent errors on write once media because you can't write the repair. Yes, you can correct the error (at time of read) due to having both redundant media, and redundant blocks. That is a normal function of

Re: [zfs-discuss] ZFS for write-only media?

Bob Friesenhahn wrote: On Tue, 22 Apr 2008, Jonathan Loran wrote: But that's the point. You can't correct silent errors on write once media because you can't write the repair. Yes, you can correct the error (at time of read) due to having both redundant media, and redundant blocks. That

Re: [zfs-discuss] ZFS for write-only media?

Ralf Bertling wrote: I am not an expert, but the MTTDL is in tousands of years when using raidz2 with a hot-spare and regular scrubbing. If you add zpool send/receive and geographically dislocated severs, this may be better than optical media, because you detect the errors early.

Re: [zfs-discuss] ZFS for write-only media?

On Tue, 22 Apr 2008, Jonathan Loran wrote: I suppose with ditto blocks, this has some merrit. Someone needs to characterize how errors probigate on different types of WORM media. perhaps this has already been done. In my experience, when DVD-R go south, they really go bad at once. Not

[zfs-discuss] ZFS for write-only media?

Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. Has this been considered? I expect that it is possible today by using files as the underlying media

Re: [zfs-discuss] ZFS for write-only media?

Bob Friesenhahn wrote: Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. I'm just going to assume that write-only here means write-once, read-many,

Re: [zfs-discuss] ZFS for write-only media?

On Mon, 21 Apr 2008, Dana H. Myers wrote: Bob Friesenhahn wrote: Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. I'm just going to assume that

Re: [zfs-discuss] ZFS for write-only media?

On Mon, 21 Apr 2008, Mark A. Carlson wrote: Maybe what you want is to archive files off to optical media? Perhaps ADM - http://opensolaris.org/os/project/adm ? That looks interesting, but true archiving is needed. The level of archiving for this application is that copies would be kept

Re: [zfs-discuss] ZFS for write-only media?

Interesting problem. And yes you are right, there are a number of problems to solve here, see: http://blogs.sun.com/mac/en_US/entry/open_archive -- mark Bob Friesenhahn wrote: On Mon, 21 Apr 2008, Mark A. Carlson wrote: Maybe what you want is to archive files off to optical media?

Re: [zfs-discuss] ZFS for write-only media?

On Mon, 21 Apr 2008, Mark A. Carlson wrote: Interesting problem. And yes you are right, there are a number of problems to solve here, see: http://blogs.sun.com/mac/en_US/entry/open_archive Standards and open source are clearly the way to go. Many open source applications have already been

Re: [zfs-discuss] ZFS for write-only media?

Bob, ADM, with an underlying ZFS filesystem, will provide a great archiving solution when fully implemented. It allows for file replication, migration from disk to tape/optical/more disk, copies any number you may want, and allows for policy management of the archives. It's underlying media

Re: [zfs-discuss] ZFS for write-only media?

Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. A simple solution would be to set up a zpool using two devices (real or ZVOL) that are the