Shared file service
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Shared File Service. VM Forum January, 2012. SFS Topics. Targeted Usage Security Accessing CIFS Shares Availability & Protection Monitoring Pricing. Targeted Usage. Departmental File Servers Shared volumes between groups of servers Protocols: CIFS or NFS Not intended for:

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Shared File Service

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Shared file service

Shared File Service

VM Forum

January, 2012

Sfs topics

SFS Topics

  • Targeted Usage

  • Security

  • Accessing CIFS Shares

  • Availability & Protection

  • Monitoring

  • Pricing

Targeted usage

Targeted Usage

  • Departmental File Servers

  • Shared volumes between groups of servers

  • Protocols: CIFS or NFS

    Not intended for:

  • Large, transactional databases

  • Storage target for backups

    • Incremental syncing is ok

  • Virtual Machine disk files (e.g., vmdk, vhd files)

  • Encrypted volume container files

  • Data with a high rate-of-change (>20% of share capacity per day)



  • CIFS

    • A Cornell AD account is required to access a share

    • NTFS ACL permissions use Cornell AD users and groups

  • NFS

    • Shared exported to explicit server(s)

    • Servers sharing share should have common UID/GIDs

    • NFS v3 (for now)

  • Restricted to on-campus IP addresses (including VPN)

  • Encryption

    • None built into service

    • Can use file-level encryption tools (e.g., PGP Net Drive)

Accessing cifs shares

Accessing CIFS Shares

  • CIFS Shares will be accessible through the Campus DFS Service


  • Additionally a custom CNAME is created for each Share to support older CIFS/SMB Clients


  • Recommend that departments utilize DFS to reference CIFS shares

  • Will not be able to use DNS names & share names of existing departmental fileservers

Availability protection

Availability & Protection

  • RAID6 to protect against spindle failures

  • Dual controllers to protect against controller failure & to facilitate maintenance activities

  • Optional snapshots to protect against user / application failures

  • Optional 2-site Asynchronous Replication to protect against building failure

  • Off-site Data Copy to protect against campus site failure

Optional snapshots

Optional Snapshots

  • Users can restore older copies of their files from these snapshots

  • No additional fee for snapshots, but share capacity is utilized for snapshots (reducing usable storage, typically by ~ 20%)

Optional replication

Optional Replication

  • Available for additional cost (2x)

  • Data replicated asynchronously between primary and secondary data centers

  • Requires snapshots

  • Secondary copy promoted to read-write status upon request, or if primary building outage

  • RPO* is 4 hours

  • RTO* measured in minutes; Once failover is invoked, it actually takes seconds to complete

    *RPO = Recovery Point Objective – how far back in time to recover from

    *RTO = Restore Time Objective – how long it will take to perform the recovery

Off site data copy

Off-site Data Copy

  • Off-site data copy is maintained

  • Protection against campus site failure

  • RPO:1 day

  • RTO:likely measured in days

  • No additional cost



  • Periodic utilization check

  • Notifications sent via e-mail

  • Notification when Warning threshold crossed(default at 80% utilization)

  • Daily notifications whenever Critical threshold is exceeded(default at 95% utilization)

  • May not be in place day 1, but shortly thereafter

Sizes monthly rates

Sizes & Monthly Rates

  • A $100 “configuration fee” (fee currently waived) may be assessed on configuration, or alteration of your share(s).

  • If optional snapshots are selected, some of the requested disk capacity is utilized for snapshot overhead (typically ~20%). Snapshots are the only way an end-user can restore a file from a “backup”.

  • If optional replication is desired, your data will be asynchronously replicated to 2 different buildings on the Ithaca Campus. Replication requires Snapshots.

  • Shares > 5TB may take longer to provision.

  • Departments will be able to trade in departmental fileservers for the Cash for Clunkers program. Up to 1TB per fileserver.


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