Re: Q: - PDU header Digest fetaure

2009-03-05 Thread Boaz Harrosh
Hi Mike, list. Mike Christie has pointed out of a serious problem for us which we need the list help of. It started with a question by Ulrich Windl of why data-digests are not supported/recommended by open-iscsi installations and distros. [iscsi data-digests is when the complete payload of an

Re: Q: - PDU header Digest fetaure

2009-02-26 Thread Vladislav Bolkhovitin
Mike Christie, on 02/25/2009 08:38 PM wrote: Another reason a lot of distros do not support it is because a common problem we always hit is that users will write out some data, then start modifying it again. But the kernel will normally not do do a sync write when you do a write. So once

Q: - PDU header Digest fetaure

2009-02-25 Thread Ulrich Windl
Hello, when browsing the open-iscsi feature list, I found: - PDU header Digest; Does this mean that data digests are not supported? A bugzilla at readhat near mid of 2007 seems to confirm this. I see the performance impact, but is there another reason against implementing it? Can I safely

Re: Q: - PDU header Digest fetaure

2009-02-25 Thread Konrad Rzeszutek
On Wed, Feb 25, 2009 at 11:39:42AM +0100, Ulrich Windl wrote: Hello, when browsing the open-iscsi feature list, I found: - PDU header Digest; Does this mean that data digests are not supported? A bugzilla at readhat near mid I am quite sure it is supported. of 2007 seems to

Re: Q: - PDU header Digest fetaure

2009-02-25 Thread Ulrich Windl
On 25 Feb 2009 at 8:55, Konrad Rzeszutek wrote: On Wed, Feb 25, 2009 at 11:39:42AM +0100, Ulrich Windl wrote: Hello, when browsing the open-iscsi feature list, I found: - PDU header Digest; Does this mean that data digests are not supported? A bugzilla at readhat near mid

Re: Q: - PDU header Digest fetaure

2009-02-25 Thread Mike Christie
Ulrich Windl wrote: Hello, when browsing the open-iscsi feature list, I found: - PDU header Digest; Is that from suse's docs or open-iscsi.orgs? Does this mean that data digests are not supported? A bugzilla at readhat near mid of 2007 seems to confirm this. Data digests were