Resending as text. SAN Storage Features affecting the Kernel ● ISCSI Array Multipathing ● LUN split over several arrays. Separate data connection to each array for parts of the LUN ● Requires kernel iSCSI path selector module per-vendor ● Thin Provisioning ● Actual allocated storage is less than requested size (akin to sparse files) ● Must handle alerts when TP threshholds reached – CHECK CONDITION raised on writes – LUN goes read-only if space exhausted ● T10 work ongoing to standardize interfaces and behavior ● TRIM / UNMAP / WRITE_SAME ● Inform storage that these blocks are no longer needed ● Useful on SANs, not just SSDs ● T10 & T13 standards proposals in flux ● XCOPY – Array-level block copy, perhaps copy-on-write ● Copy blocks w/o incuring network and CPU overhead ● VFS function? ● T10 standard already (SCSI Extended Copy) SAN Storage Features needing basic CLI work ● Multi-IQN – iSCSI IQNs are assigned to Guest VMs ● Implemented in iscsi-initiator-utils today, thank you! ● VM Guest boot from iSCSI ● Requires iSCSI Initiator in VM BIOS ● Fedora 11 KVM will load gPXE iSCSI Option ROMs, thank you! ● Array-based LUN snapshots ● ioctl(FIFREEZE) added Jan 09 by Takashi Sato of NEC, thank you! ● Need CLI to freeze file system, issue array-based snapshot command, and thaw file system Thanks, Mark -----Original Message----- From: James Bottomley [mailto:James.Bottomley@xxxxxxxxxxxxxxxxxxxxx] Sent: Friday, June 18, 2010 10:12 AM To: Ruder, Mark Cc: lsf10-pc@xxxxxxxxxxxxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx Subject: Re: [Lsf10-pc] Suggested topic for August LSF summit event (SCSI/FS/MM) On Fri, 2010-06-18 at 09:55 -0500, Mark_Ruder@xxxxxxxx wrote: > I was asked to share suggested topics that we would be interested in > being discussed in the upcoming LSF Summit even in early August. > Rather that re-typing all of them into this email, I’ve attached a > slide deck developed by Matt Domsch in Dell’s CTO office as a starting > point. It is a bit dated, but we feel that topics are still relevant > to us. We got this on the PC lists, but all of the other mailing lists will have discarded it sight unseen (enforcing plain text only and nothing other than text/plain attachments is a standard list spam mitigation technique). Could you summarise as text (you can just go to the outline view and paste everything into a text window). James ��.n��������+%������w��{.n�����{���)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
