Re: [CentOS] Possible SAN Issue
Jim Perrin wrote: > This is where LVM shines, because you can simply add another lun, add > it to your lvm setup, and expand the filesystem on the fly. Also the OP should look into thin provisioning software that may be available for his EMC array. In some situations this can eliminate the need for LVM. For me I still use LVM because it helps when detecting what paths to use with MPIO. I often create larger(1-2TB) volumes on the storage array and then create smaller logical volumes in LVM, then when I need to expand I just expand, no need for new LUNs. If your data access patterns don't involve large amounts of writes and then deletes(thin provisioning dedicates storage when it is written to), then you don't need volume management at all the array can do it for you. Most workloads in my experience are friendly with thin provisioning, some are not. Some vendors have ways to reclaim deleted space as well to put it back into the storage pool(s) for use by other systems. http://searchstorage.techtarget.com/news/column/0,294698,sid5_gci1134713,00.html nate ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Possible SAN Issue
Jim Perrin wrote: > This is where LVM shines, because you can simply add another lun, add > it to your lvm setup, and expand the filesystem on the fly. Just hope that $guru didnt use fdisk to setup things, when you need to grow the LUN a bit. - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Possible SAN Issue
On Thu, May 14, 2009 at 6:48 AM, Alan Bartlett wrote: > Just a quick ping to the general m/l. > > Is there a SAN expert out there who could spare some time to have a > look at this forum post, please? > > URL -- > http://www.centos.org/modules/newbb/viewtopic.php?topic_id=20273&forum=39 If you unmount the partition, then rescan the scsi bus it'll work. Basically your system won't see the additional space while you're using the partition. if you stop using it (unmount) then you can operate on it and bring it back online. This is where LVM shines, because you can simply add another lun, add it to your lvm setup, and expand the filesystem on the fly. -- During times of universal deceit, telling the truth becomes a revolutionary act. George Orwell ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Possible SAN Issue
On May 14, 2009, at 6:48 AM, Alan Bartlett wrote: > Just a quick ping to the general m/l. > > Is there a SAN expert out there who could spare some time to have a > look at this forum post, please? > > URL -- > http://www.centos.org/modules/newbb/viewtopic.php?topic_id=20273&forum=39 Doing storage work is a pain, it means you are up in the middle of the night doing all sorts of scary stuff with the company's data. You are going to have to reboot to see the new size because the partition is in use. I highly recommend using LVM on the bare SAN volume next time. -Ross ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
