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Hey mid-range storage expert goons! I was wondering if I could get a fact-check from you folks. I've been reading about reports of SAN failures and, well, we just had one  Dell/EMC AX150i, dual-SPs, populated with 750gb SATA drives, pretty simple setup (about 5 servers connected). Just allocated the last of my storage to extend our fileservers a few days ago. Suddenly during our normal backup (3am-ish) I get alerts that all of the servers attached to that particular SAN box have dropped their disks. No pings from management (on either SP), no pings from any iSCSI port. yikes. A reboot of the SAN and re-flash of the FLARE on SPB (which had just kept rebooting itself) and we're back up and running. So here's my question: Dell's EMC guy tells me that "its a best practice not to put any LUNS on the OS drives' disk pool", which is 4 of my disks (about 1/3 of my total capacity). Apparently since I allocated all the available space on the OS pool, it caused the SAN OS to run out of page space when the IOs went up during our backups. So am I seriously not supposed to store anything on the ~2TB of OS pool disk just because the SAN OS needs it for a pagefile!? This seems insane to me and a horribly bad design. Anyone else have this experience or any insight into this?
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Oct 3, 2008 15:13
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| # ¿ May 9, 2024 00:23 |
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Catch 22 posted:You can store data on the OS LUN, but its best not to. Yes, the SAN was supposed to be for one set of servers, but it got expanded to include others that probably would have been better served by something like shared SCSI for some of the use (2-node clusters). I guess I was expecting the SAN to have some kind of internal disk for the SPs, this was bad research on my part. Me: "sure we have all this unused disk space!"  Live and learn, fortunately we can work around this, it just sucks having all that unused space. Catch 22 posted:
Yes we have a hotspare, but it's not assigned to a particular pool (it doesn't give me the option, it seems the 150 just has a shared hotspare for all pools) Thanks again catch-22! I appreciate the response.
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Oct 3, 2008 16:02
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