Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-11 Thread Geoff Nordli
>-Original Message- >From: Brandon High [mailto:bh...@freaks.com] >Sent: Monday, May 10, 2010 5:56 PM > >On Mon, May 10, 2010 at 3:53 PM, Geoff Nordli wrote: >> Doesn't this alignment have more to do with aligning writes to the >> stripe/segment size of a traditional storage array?  The

Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-10 Thread Brandon High
On Mon, May 10, 2010 at 3:53 PM, Geoff Nordli wrote: > Doesn't this alignment have more to do with aligning writes to the > stripe/segment size of a traditional storage array?  The articles I am It is a lot like a stripe / segment size. If you want to think of it in those terms, you've got a segm

Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-10 Thread Geoff Nordli
>-Original Message- >From: Brandon High [mailto:bh...@freaks.com] >Sent: Monday, May 10, 2010 3:12 PM > >On Mon, May 10, 2010 at 1:53 PM, Geoff Nordli wrote: >> You are right, I didn't look at that property, and instead I was >> focused on the record size property. > >zvols don't have a

Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-10 Thread Brandon High
On Mon, May 10, 2010 at 1:53 PM, Geoff Nordli wrote: > You are right, I didn't look at that property, and instead I was focused on > the record size property. zvols don't have a recordsize - That's a property of filesystem datasets, not volumes. > When I look at the stmfadm llift-lu -v it s

Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-10 Thread Geoff Nordli
>-Original Message- >From: Brandon High [mailto:bh...@freaks.com] >Sent: Monday, May 10, 2010 9:55 AM > >On Sun, May 9, 2010 at 9:42 PM, Geoff Nordli wrote: >> I am looking at using 8K block size on the zfs volume. > >8k is the default for zvols. > You are right, I didn't look at that p

Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-10 Thread Roy Sigurd Karlsbakk
- "Brandon High" skrev: > On Sun, May 9, 2010 at 9:42 PM, Geoff Nordli wrote: > > I am looking at using 8K block size on the zfs volume. > > 8k is the default for zvols. So with a 1TB zbol with default blocksize, dedup is done on 8k blocks? If so, some 32 gigs of memory (or l2arc) will be

Re: [zfs-discuss] ZFS and Comstar iSCSI BLK size

2010-05-10 Thread Brandon High
On Sun, May 9, 2010 at 9:42 PM, Geoff Nordli wrote: > I am looking at using 8K block size on the zfs volume. 8k is the default for zvols. > I was looking at the comstar iscsi settings and there is also a blk size > configuration, which defaults as 512 bytes. That would make me believe that > all