EMC Storage Product Knowledge Sharing

SUN/SOLARIS___________To display what HBA's are installed.#prtdiag -v#dmesg#cat /var/adm/messages grep -i wwn moreTo set the configuration you must carry out the following:-changes to the /etc/system file-HBA driver modifications-Persistent binding (HBA and SD driver config file)-EMC recommended changes-Install the Sun StorEdge SAN Foundation packageChanges to /etc/system: ( Plz ignore 3 equal sign when u edit the file)SCSI throttle === set sd:sd_max_throttle=20Enable wide SCSI === set scsi_options=0x7F8SCSI I/O timeout value...

Handling BCV and Clone Disk on Veritas Volume Manager. Get Output of Vxdisk List command# vxdisk listVxdisk list command showing that some disks are marked with the udid_mismatch flag.Write a New UUID to DiskYou can use the following command to update the unique disk identifier (UDID) for one or more disks:# vxdisk [-f] [-g diskgroup] updateudid disk ...Note : The -f option must be specified if VxVM has not raised the udid_mismatch flag for a disk.Importing a disk group containing cloned/BCV disksYou can then import the cloned...

I tried to collect some good information on iSCSI driver details which was request by some reader. Hope this will help you on iSCSI queries. Leave comment if it is useful... I will try to write iSCSI overview in next entry. Happy Reading!!!!!!The iSCSI driver provides a transport for SCSI requests and responses to storage devices via an IP network instead of using a direct attached SCSI bus channel or an FC connection. The SN 5400 Series Storage Router, in turn, transports these SCSI requests and responses received via the IP...

Mount EMC BCVs at the same hostExample:I have created a volumegroup, a logical volume, afilesystem and a file on two EMC standard volumes.(For this test you need to have two hdisks hdisk and hdisk andtwo BCVs dev and available)# mkvg -f -y MyName_vg -s 16 hdisk hdisk# mklv -y MyName_lv -b n MyName_vg 20# crfs -v jfs -d MyName_lv -m /MyName_mp -A yes -p rw# mount /MyName_mp# lptest > /MyName_mp/lptest.outFor using EMCs TimeFinder I have to create a device group.(AIX is working with volumegroups. EMCs TimeFinder is working...

LUN Basics Simply stated, a LUN is a logical entity that converts raw physical disk space into logical storage space that a host server's operating system can access and use. Any computer user recognizes the logical drive letter that has been carved out of their disk drive. For example, a computer may boot from the C: drive and access file data from a different D: drive. LUNs do the same basic job. "LUNs differentiate between different chunks of disk space. "A LUN is part of the address of the storage that you're presenting...

Very simply, RAID striping is a means of improving the performance of large storage systems. For most normal PCs or laptops, files are stored in their entirety on a single disk drive, so a file must be read from start to finish and passed to the host system. With large storage arrays, disks are often organized into RAID groups that can enhance performance and protect data against disk failures. Striping is actually RAID-0; a technique that breaks up a file and interleaves its contents across all of the disks in the RAID group....

You have two fabrics running off of two switches. You'd like to make them one fabric. How to do that? For the most part, it's simply connecting the two switches via e_ports. Before doing that, however, realize there's several factors that can prevent them from mergingg Incompatible operating parameters such as RA_TOV and ED_TOV Duplicate domain IDs. Incompatible zoning configurations No principal switch (priority set to 255 on all switches) No response from the switch (hello sent every 30 seconds) ...

EMC recommends no more than four connectrix switches per fabric based on the following formulae:One Switch -32 Total ports- 4 ports reserved for card failure28 ports remaining.- (int(28/5)) No more than 4:1 ratio, hosts : fa23 Possible host connections-2 to support multi-pathing-11 total host connectionsTwo Switch- 64 Total ports- 4 ports reserved for card failure- 4 ports reserved for E_ports- 56 ports remaining.-(int(56/5)) No more than 4:1 ratio, hosts : fa-45 Possible host connections-/ 2 to support multi-pathing22 host...

Kashya (EMC Acquired last year ) develops unique algorithmic technologies to enable an order of magnitude improvement in the reliability, cost, and performance of an enterprise’s data protection capabilities. Based on the Kashya Data Protection Appliance platform, Kashya’s powerful solutions deliver superior data protection at a fraction of the cost of existing solutions. Kashya’s Data Protection Appliance connects to the SAN and IP infrastructure...