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Smart Storage and Linux An EMC Perspective

Smart Storage and Linux An EMC Perspective. Ric Wheeler ric@emc.com. Why Smart Storage?. Central control of critical data One central resource to fail-over in disaster planning Banks, trading floor, air lines want zero downtime Smart storage is shared by all hosts & OS’es

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Smart Storage and Linux An EMC Perspective

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  1. Smart Storage and LinuxAn EMC Perspective Ric Wheeler ric@emc.com

  2. Why Smart Storage? • Central control of critical data • One central resource to fail-over in disaster planning • Banks, trading floor, air lines want zero downtime • Smart storage is shared by all hosts & OS’es • Amortize the costs of high availability and disaster planning over all of your hosts • Use different OS’es for different jobs (UNIX for the web, IBM mainframes for data processing) • Zero-time “transfer” from host to host when both are connected • Enables cluster file systems

  3. Data Center Storage Systems • Change the way you think of storage • Shared Connectivity Model • “Magic” Disks • Scales to new capacity • Storage that runs for years at a time • Symmetrix case study • Symmetrix 8000 Architecture • Symmetrix Applications • Data center class operating systems

  4. Traditional Model of Connectivity • Direct Connect • Disk attached directly to host • Private - OS controls access and provides security • Storage I/O traffic only • Separate system used to support network I/O (networking, web browsing, NFS, etc)

  5. Shared Models of Connectivity • VMS Cluster • Shared disk & partitions • Same OS on each node • Scales to dozens of nodes • IBM Mainframes • Shared disk & partitions • Same OS on each node • Handful of nodes • Network Disks • Shared disk/private partition • Same OS • Raw/block access via network • Handful of nodes

  6. New Models of Connectivity FreeBSD VMS Linux • Every host in a data center could be connected to the same storage system • Heterogeneous OS & data format (CKD & FBA) • Management challenge: No central authority to provide access control Solaris Shared Storage IRIX DGUX NT HPUX MVS

  7. Magic Disks • Instant copy • Devices, files or data bases • Remote data mirroring • Metropolitan area • 100’s of kilometers • 1000’s of virtual disks • Dynamic load balancing • Behind the scenes backup • No host involved

  8. Scalable Storage Systems • Current systems support • 10’s of terabytes • Dozens of SCSI, fibre channel, ESCON channels per host • Highly available (years of run time) • Online code upgrades • Potentially 100’s of hosts connected to the same device • Support for chaining storage boxes together locally or remotely

  9. Symmetrix Architecture • 32 PowerPC 750’s based “directors” • Up to 32 GB of central “cache” for user data • Support for SCSI, Fibre channel, Escon, … • 384 drives (over 28 TB with 73 GB units)

  10. Linux Wish List:Lots of Devices • Customers can uses hundreds of targets and LUN’s (logical volumes) • 128 SCSI devices per system is too few • Better naming system to track lots of disks • Persistence for “not ready” devices in the name space would help some of our features • devfs solves some of this • Rational naming scheme • Potential for tons of disk devices (need SCSI driver work as well)

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