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  • FLARE 30 is out in the wild!

    Posted on September 3rd, 2010 ashinn No comments

    If you didn’t already know, after a few delays, FLARE 30 is now available for download on PowerLink. I’ve been playing with Unisphere a bit, and it seems like an improvement over ole Navisphere. However, it’ll take awhile to shed those old Navi ways. At the very least its a solid base to start fresh on.

    If I have any disappointment…. it would be how much DIDN’T change in Unisphere. In particular I was disappointed to see very little was done to improve analyzer. Lets hope thats something they build upon in later versions. Perhaps I was just expecting too much for a v1.0 release. Don’t get me wrong, I STRONGLY SUPPORT EMC revamping the midrange administraton tools.

    One small thing is Unisphere finally shows you what failover mode a host is at in connection manager. I realize it was no big deal to find out, but its one less proceedure to do. They also put the name of the mode along with the number (IE 4 = ALUA and so on).

    Also the way snapshots and clones are presented/organized is a pretty big step forward. I could go on and on, just download Unisphere and play around.

    I can’t tell you how it looks with the Celerra yet since none of my Celerra’s are on DART 6. If you try to administer a DART 5.x box, it launches a browser window to the control station (how nice of it!).

    I’m currently trying to figure out if a Celerra running DART 5.6.49 will work with FLARE 30 or not. I have a NS-960 basically not doing anything (who doesn’t?!), but I don’t want to brick the DART installation if I can avoid it! If/when I can get a straight answer out of EMC I’ll update this post.

    I really want to put FAST Cache and all VAAI through the paces before unleashing this day 1 code onto my poor customers & users. Hopefully I’ll get a thumbs up/down by this weekend from support and I can start doing some IO testing and report back.

    Of note I was told by an EMC TC that FLARE 30 = RecoverPoint upgrade, but I’ve yet to find a document to back that up. Just incase I bounced this CX/NS-960 out of the available RP splitters for now.

  • Dynamically rescan LUN’s on SLES

    Posted on February 24th, 2009 ashinn 6 comments

    I’m sure this is kids play to most people, but I’ve just not done much SAN work with Linux.

    We bought a new EMC CLARiiON CX4-240, and I was just tossing it random LUN’s to do speed & HA tests. When I added a LUN I’d see it in powermt, and I didn’t know what the equivalent of devfsadm was in Linux … SLES to be specific. What can I say, I worked with Solaris way too long.

    The first step is to run: powermt display

    # powermt display
    CLARiiON logical device count=3
    ================================================
    —– Host Bus Adapters ——— —— I/O Paths —– —— Stats ——
    ### HW Path Summary Total Dead IO/Sec Q-IOs Errors
    ================================================
    3 qla2xxx optimal 6 0 – 0 0
    4 qla2xxx optimal 6 0 – 0 0

    Note the 3/4 preceding the HBA’s.

    Now, execute this:

    # echo “- – -” > /sys/class/scsi_host/host3/scan
    # echo “- – -” > /sys/class/scsi_host/host4/scan

    Its my understand this also works on RHEL and others, but YMMV. This is all buried in the PowerPath manual too, but hopefully I’ve saved someone a bit of time.

    Till next time…