RE: [zfs-discuss] Re: Recommendation ZFS on StorEdge 3320 - offtopic

2006-09-08 Thread Bennett, Steve
Dunno about eSATA jbods, but eSATA host ports have appeared on at least two HDTV-capable DVRs for storage expansion (looks like one model of the Scientific Atlanta cable box DVR's as well as on the shipping-any-day-now Tivo Series 3). It's strange that they didn't go with firewire since

RE: [zfs-discuss] ZFS Boot Disk

2006-08-18 Thread Bennett, Steve
Lori said: The limitation is mainly about the *number* of disks that can be accessed at one time. ... But with straight mirroring, there's no such problem because any disk in the mirror can supply all of the disk blocks needed to boot. Does that mean that these restrictions will go away

RE: [zfs-discuss] How to best layout our filesystems

2006-07-27 Thread Bennett, Steve
Eric said: For U3, these are the performance fixes: 6424554 full block re-writes need not read data in 6440499 zil should avoid txg_wait_synced() and use dmu_sync() to issue parallelIOs when fsyncing 6447377 ZFS prefetch is inconsistant 6373978 want to take lots of snapshots quickly ('zfs

RE: [zfs-discuss] Expanding raidz2

2006-07-13 Thread Bennett, Steve
I guess that could be made to work, but then the data on the disk becomes much (much much) more difficult to interpret because you have some rows which are effectively one width and others which are another (ad infinitum). How do rows come into it? I was just assuming that each

RE: [zfs-discuss] Expanding raidz2

2006-07-13 Thread Bennett, Steve
Jeff Bonwick said: RAID-Z takes a different approach. We were designing a filesystem as well, so we could make the block pointers as semantically rich as we wanted. To that end, the block pointers in ZFS contains data layout information. One nice side effect of this is that we don't need

RE: [zfs-discuss] ZFS needs a viable backup mechanism

2006-07-07 Thread Bennett, Steve
If you are going to use Veritas NetBackup why not use the native Solaris client ? I don't suppose anyone knows if Networker will become zfs-aware at any point? e.g. backing up properties backing up an entire pool as a single save set efficient incrementals (something similar to zfs

RE: [zfs-discuss] ZFS needs a viable backup mechanism

2006-07-07 Thread Bennett, Steve
Mike said: 3) ZFS ability to recognize duplicate blocks and store only one copy. I'm not sure the best way to do this, but my thought was to have ZFS remember what the checksums of every block are. As new blocks are written, the checksum of the new block is compared to known checksums. If

RE: [zfs-discuss] Re: Re: Supporting ~10K users on ZFS

2006-06-30 Thread Bennett, Steve
Casper said: You can have composite mounts (multiple nested mounts) but that is essentially a single automount entry so it can't be overly long, I believe. I've seen that in the man page, but I've never managed to find a use for it! What I'd *like* to be able to do is have a map that amounts

[zfs-discuss] what to put on zfs

2006-06-30 Thread Bennett, Steve
A slightly different tack now... what filesystems is it a good (or bad) idea to put on ZFS? root - NO (not yet anyway) home - YES (although the huge number of mounts still scares me a bit) /usr - possible? /var - possible? swap - no? Is there any advantage in having multiple zpools over just