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    APPLYING VIRTUAL MACHINE PERFORMANCE OBJECTIVES ON A STORAGE SYSTEM
    23.
    发明申请
    APPLYING VIRTUAL MACHINE PERFORMANCE OBJECTIVES ON A STORAGE SYSTEM 审中-公开

    公开(公告)号：US20200249847A1

    公开(公告)日：2020-08-06

    申请号：US16263050

    申请日：2019-01-31

    Applicant: EMC IP Holding Company LLC

    Inventor： Adnan Sahin ,  Owen Martin ,  Sanjib Mallick ,  Arieh Don

    IPC: G06F3/06 ,  G06F9/455

    Abstract: Service level objectives (SLOs) defined for a storage system are associated with VMs running on hosts. For an I/O operation for a virtual machine (VM) running on a host system, storage processing is performed on the I/O operation in accordance with the SLO defined for the VM. The same storage system-defined SLOs may be applied to VMs running on multiple host systems. SLOs may be maintained by the storage array and shared with one or more host systems in I/O communication with the storage system. SLOs may be defined using a user interface of a storage system, host system, virtualizer control station or other component of a storage network, and communicated to the storage system, which may maintain the SLOs, and may disseminate them to one or more hosts. The SLOs then may be associated with VMs running on the hosts and tagged to I/O communications corresponding to the VMs.

    Cache hit ratio simulation using a partial data set
    24.
    发明授权
    Cache hit ratio simulation using a partial data set 有权

    公开(公告)号：US10713164B1

    公开(公告)日：2020-07-14

    申请号：US15649925

    申请日：2017-07-14

    Applicant: EMC IP Holding Company LLC

    Inventor： Adnan Sahin ,  Amnon Naamad

    IPC: G06F17/11 ,  G06F12/0802 ,  G06F12/0862 ,  G06F17/18

    Abstract: A method of cache hit ratio simulation using a partial data set includes determining a set of sampled addresses, the set of sampled addresses being a subset of all addresses of a storage system of a storage environment. The method further includes using, by a simulation engine, a cache management algorithm to determine a cache hit ratio of the sampled addresses, the cache management algorithm being also used by a cache manager to place a portion of the addresses of the storage system into cache during a runtime operation. The method further includes determining a quantity of memory access operations to frequently accessed addresses in the set of sampled addresses, and correcting, by the simulation engine, the cache hit ratio of the sampled addresses based on the quantity of memory access operations to the frequently accessed addresses in the set of sampled addresses. The simulation also handles sequential operations accurately.

    System, method and computer readable medium for obtaining consistent read performance for a plurality of flash drives or raid groups using workload and capacity limits
    26.
    发明授权
    System, method and computer readable medium for obtaining consistent read performance for a plurality of flash drives or raid groups using workload and capacity limits 有权

    公开(公告)号：US10254970B1

    公开(公告)日：2019-04-09

    申请号：US15198772

    申请日：2016-06-30

    Applicant: EMC IP Holding Company LLC

    Inventor： Owen Martin ,  Hui Wang ,  Malak Alshawabkeh ,  Adnan Sahin ,  Arieh Don ,  Xiaomei Liu

    IPC: G06F3/06

    Abstract: Techniques for obtaining consistent read performance are disclosed that may include: receiving measured read I/O (input/output) response times for flash storage devices; and determining, in accordance with a specified allowable variation, whether a first of the measured read I/O response times for a first of the flash storage devices is inconsistent with respect to other ones of the measured read I/O response times. Responsive to determining the first measured read I/O response time is inconsistent first processing may be performed that corrects or alleviates the inconsistency of the first measured read I/O response time. The first processing may include varying the first measured read I/O response time of the first flash storage device by enforcing, for the first flash storage device, a write I/O workload limit a read I/O workload limit and an idle capacity limit. Data portions may be ranked and selected for data movement based on read workload, write workload or idle capacity. The flash storage may include storage devices of the same type or technology, and the same capacity. Response times for RAID groups may also be measured.

    Power saving mechanisms for a dynamic mirror service policy
    27.
    发明授权
    Power saving mechanisms for a dynamic mirror service policy 有权

    公开(公告)号：US10235072B1

    公开(公告)日：2019-03-19

    申请号：US15233461

    申请日：2016-08-10

    Applicant: EMC IP Holding Company LLC

    Inventor： Adnan Sahin ,  Sachin More ,  Preston Crow ,  Ron Arnan

    IPC: G06F12/00 ,  G06F3/06 ,  G06F12/0866

    Abstract: Described is storage system and method for reducing power consumption. The storage system has first and second physical disks configured to provide mirroring. The first physical disk is placed into a power-saving mode of operation, while the second physical disk is in an active mode of operation responding to read and write requests. The first physical disk transitions from the power-saving mode of operation to an active mode of operation for destaging writes pending from cache to the first physical disk, while the second physical disk responds to read and write requests. The second physical disk transitions from the active mode of operation to the power-saving mode of operation, while the first physical disk responds to read and write requests.

    Securing storage control path against unauthorized access
    28.
    发明授权
    Securing storage control path against unauthorized access 有权

    公开(公告)号：US10102356B1

    公开(公告)日：2018-10-16

    申请号：US15064829

    申请日：2016-03-09

    Applicant: EMC IP Holding Company LLC

    Inventor： Adnan Sahin ,  Michael Specht

    IPC: G06F17/00 ,  G06F21/31 ,  G06F21/62

    Abstract: Techniques are described providing secure authentication of control commands executed on a data storage system. A pass code may be generated in accordance with criteria in response to successful two-factor authentication of a user identifier. Providing a valid generated passcode may be required with a control command in order for a data storage system to execute the control command. The control command may be one of a subset of possible control command that may be performed with respect to storage entities, such as logical devices and snapshots thereof. In another embodiment, rather than providing a pass code, the two factor authentication information and user identifier may be provided with the control command whereby successful completion of two-factor authentication of the user identifier and two factor authentication information may be required in order to execute the control command.

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