| What: /sys/fs/lustre/version |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows current running lustre version. |
| |
| What: /sys/fs/lustre/pinger |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows if the lustre module has pinger support. |
| "on" means yes and "off" means no. |
| |
| What: /sys/fs/lustre/health |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows whenever current system state believed to be "healthy", |
| "NOT HEALTHY", or "LBUG" whenever lustre has experienced |
| an internal assertion failure |
| |
| What: /sys/fs/lustre/jobid_name |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Currently running job "name" for this node to be transferred |
| to Lustre servers for purposes of QoS and statistics gathering. |
| Writing into this file will change the name, reading outputs |
| currently set value. |
| |
| What: /sys/fs/lustre/jobid_var |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Control file for lustre "jobstats" functionality, write new |
| value from the list below to change the mode: |
| disable - disable job name reporting to the servers (default) |
| procname_uid - form the job name as the current running |
| command name and pid with a dot in between |
| e.g. dd.1253 |
| nodelocal - use jobid_name value from above. |
| |
| What: /sys/fs/lustre/timeout |
| Date: June 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls "lustre timeout" variable, also known as obd_timeout |
| in some old manual. In the past obd_timeout was of paramount |
| importance as the timeout value used everywhere and where |
| other timeouts were derived from. These days it's much less |
| important as network timeouts are mostly determined by |
| AT (adaptive timeouts). |
| Unit: seconds, default: 100 |
| |
| What: /sys/fs/lustre/max_dirty_mb |
| Date: June 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls total number of dirty cache (in megabytes) allowed |
| across all mounted lustre filesystems. |
| Since writeout of dirty pages in Lustre is somewhat expensive, |
| when you allow to many dirty pages, this might lead to |
| performance degradations as kernel tries to desperately |
| find some pages to free/writeout. |
| Default 1/2 RAM. Min value 4, max value 9/10 of RAM. |
| |
| What: /sys/fs/lustre/debug_peer_on_timeout |
| Date: June 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Control if lnet debug information should be printed when |
| an RPC timeout occurs. |
| 0 disabled (default) |
| 1 enabled |
| |
| What: /sys/fs/lustre/dump_on_timeout |
| Date: June 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls if Lustre debug log should be dumped when an RPC |
| timeout occurs. This is useful if yout debug buffer typically |
| rolls over by the time you notice RPC timeouts. |
| |
| What: /sys/fs/lustre/dump_on_eviction |
| Date: June 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls if Lustre debug log should be dumped when an this |
| client is evicted from one of the servers. |
| This is useful if yout debug buffer typically rolls over |
| by the time you notice the eviction event. |
| |
| What: /sys/fs/lustre/at_min |
| Date: July 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls minimum adaptive timeout in seconds. If you encounter |
| a case where clients timeout due to server-reported processing |
| time being too short, you might consider increasing this value. |
| One common case of this if the underlying network has |
| unpredictable long delays. |
| Default: 0 |
| |
| What: /sys/fs/lustre/at_max |
| Date: July 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls maximum adaptive timeout in seconds. If at_max timeout |
| is reached for an RPC, the RPC will time out. |
| Some genuinuely slow network hardware might warrant increasing |
| this value. |
| Setting this value to 0 disables Adaptive Timeouts |
| functionality and old-style obd_timeout value is then used. |
| Default: 600 |
| |
| What: /sys/fs/lustre/at_extra |
| Date: July 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls how much extra time to request for unfinished requests |
| in processing in seconds. Normally a server-side parameter, it |
| is also used on the client for responses to various LDLM ASTs |
| that are handled with a special server thread on the client. |
| This is a way for the servers to ask the clients not to time |
| out the request that reached current servicing time estimate |
| yet and give it some more time. |
| Default: 30 |
| |
| What: /sys/fs/lustre/at_early_margin |
| Date: July 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls when to send the early reply for requests that are |
| about to timeout as an offset to the estimated service time in |
| seconds.. |
| Default: 5 |
| |
| What: /sys/fs/lustre/at_history |
| Date: July 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls for how many seconds to remember slowest events |
| encountered by adaptive timeouts code. |
| Default: 600 |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/blocksize |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Biggest blocksize on object storage server for this filesystem. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/kbytestotal |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows total number of kilobytes of space on this filesystem |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/kbytesfree |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows total number of free kilobytes of space on this filesystem |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/kbytesavail |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows total number of free kilobytes of space on this filesystem |
| actually available for use (taking into account per-client |
| grants and filesystem reservations). |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/filestotal |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows total number of inodes on the filesystem. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/filesfree |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows estimated number of free inodes on the filesystem |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/client_type |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows whenever this filesystem considers this client to be |
| compute cluster-local or remote. Remote clients have |
| additional uid/gid convrting logic applied. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/fstype |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows filesystem type of the filesystem |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/uuid |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows this filesystem superblock uuid |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/max_read_ahead_mb |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Sets maximum number of megabytes in system memory to be |
| given to read-ahead cache. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/max_read_ahead_per_file_mb |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Sets maximum number of megabytes to read-ahead for a single file |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/max_read_ahead_whole_mb |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| For small reads, how many megabytes to actually request from |
| the server as initial read-ahead. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/checksum_pages |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Enables or disables per-page checksum at llite layer, before |
| the pages are actually given to lower level for network transfer |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/stats_track_pid |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Limit Lustre vfs operations gathering to just a single pid. |
| 0 to track everything. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/stats_track_ppid |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Limit Lustre vfs operations gathering to just a single ppid. |
| 0 to track everything. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/stats_track_gid |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Limit Lustre vfs operations gathering to just a single gid. |
| 0 to track everything. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/statahead_max |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls maximum number of statahead requests to send when |
| sequential readdir+stat pattern is detected. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/statahead_agl |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls if AGL (async glimpse ahead - obtain object information |
| from OSTs in parallel with MDS during statahead) should be |
| enabled or disabled. |
| 0 to disable, 1 to enable. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/lazystatfs |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls statfs(2) behaviour in the face of down servers. |
| If 0, always wait for all servers to come online, |
| if 1, ignote inactive servers. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/max_easize |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows maximum number of bytes file striping data could be |
| in current configuration of storage. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/default_easize |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows maximum observed file striping data seen by this |
| filesystem client instance. |
| |
| What: /sys/fs/lustre/llite/<fsname>-<uuid>/xattr_cache |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls extended attributes client-side cache. |
| 1 to enable, 0 to disable. |
| |
| What: /sys/fs/lustre/ldlm/cancel_unused_locks_before_replay |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls if client should replay unused locks during recovery |
| If a client tends to have a lot of unused locks in LRU, |
| recovery times might become prolonged. |
| 1 - just locally cancel unused locks (default) |
| 0 - replay unused locks. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/resource_count |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Displays number of lock resources (objects on which individual |
| locks are taken) currently allocated in this namespace. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/lock_count |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Displays number or locks allocated in this namespace. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/lru_size |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls and displays LRU size limit for unused locks for this |
| namespace. |
| 0 - LRU size is unlimited, controlled by server resources |
| positive number - number of locks to allow in lock LRU list |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/lock_unused_count |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Display number of locks currently sitting in the LRU list |
| of this namespace |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/lru_max_age |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Maximum number of milliseconds a lock could sit in LRU list |
| before client would voluntarily cancel it as unused. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/early_lock_cancel |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls "early lock cancellation" feature on this namespace |
| if supported by the server. |
| When enabled, tries to preemtively cancel locks that would be |
| cancelled by verious operations and bundle the cancellation |
| requests in the same RPC as the main operation, which results |
| in significant speedups due to reduced lock-pingpong RPCs. |
| 0 - disabled |
| 1 - enabled (default) |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/granted |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Displays number of granted locks in this namespace |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/grant_rate |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of granted locks in this namespace during last |
| time interval |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/cancel_rate |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of lock cancellations in this namespace during |
| last time interval |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/grant_speed |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Calculated speed of lock granting (grant_rate - cancel_rate) |
| in this namespace |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/grant_plan |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Estimated number of locks to be granted in the next time |
| interval in this namespace |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/limit |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls number of allowed locks in this pool. |
| When lru_size is 0, this is the actual limit then. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/lock_volume_factor |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Multiplier for all lock volume calculations above. |
| Default is 1. Increase to make the client to more agressively |
| clean it's lock LRU list for this namespace. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/server_lock_volume |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Calculated server lock volume. |
| |
| What: /sys/fs/lustre/ldlm/namespaces/<name>/pool/recalc_period |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls length of time between recalculation of above |
| values (in seconds). |
| |
| What: /sys/fs/lustre/ldlm/services/ldlm_cbd/threads_min |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls minimum number of ldlm callback threads to start. |
| |
| What: /sys/fs/lustre/ldlm/services/ldlm_cbd/threads_max |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls maximum number of ldlm callback threads to start. |
| |
| What: /sys/fs/lustre/ldlm/services/ldlm_cbd/threads_started |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows actual number of ldlm callback threads running. |
| |
| What: /sys/fs/lustre/ldlm/services/ldlm_cbd/high_priority_ratio |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls what percentage of ldlm callback threads is dedicated |
| to "high priority" incoming requests. |
| |
| What: /sys/fs/lustre/{obdtype}/{connection_name}/blocksize |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Blocksize on backend filesystem for service behind this obd |
| device (or biggest blocksize for compound devices like lov |
| and lmv) |
| |
| What: /sys/fs/lustre/{obdtype}/{connection_name}/kbytestotal |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Total number of kilobytes of space on backend filesystem |
| for service behind this obd (or total amount for compound |
| devices like lov lmv) |
| |
| What: /sys/fs/lustre/{obdtype}/{connection_name}/kbytesfree |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of free kilobytes on backend filesystem for service |
| behind this obd (or total amount for compound devices |
| like lov lmv) |
| |
| What: /sys/fs/lustre/{obdtype}/{connection_name}/kbytesavail |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of kilobytes of free space on backend filesystem |
| for service behind this obd (or total amount for compound |
| devices like lov lmv) that is actually available for use |
| (taking into account per-client and filesystem reservations). |
| |
| What: /sys/fs/lustre/{obdtype}/{connection_name}/filestotal |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of inodes on backend filesystem for service behind this |
| obd. |
| |
| What: /sys/fs/lustre/{obdtype}/{connection_name}/filesfree |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of free inodes on backend filesystem for service |
| behind this obd. |
| |
| What: /sys/fs/lustre/mdc/{connection_name}/max_pages_per_rpc |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Maximum number of readdir pages to fit into a single readdir |
| RPC. |
| |
| What: /sys/fs/lustre/{mdc,osc}/{connection_name}/max_rpcs_in_flight |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Maximum number of parallel RPCs on the wire to allow on |
| this connection. Increasing this number would help on higher |
| latency links, but has a chance of overloading a server |
| if you have too many clients like this. |
| Default: 8 |
| |
| What: /sys/fs/lustre/osc/{connection_name}/max_pages_per_rpc |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Maximum number of pages to fit into a single RPC. |
| Typically bigger RPCs allow for better performance. |
| Default: however many pages to form 1M of data (256 pages |
| for 4K page sized platforms) |
| |
| What: /sys/fs/lustre/osc/{connection_name}/active |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls accessibility of this connection. If set to 0, |
| fail all accesses immediately. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/checksums |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls whenever to checksum bulk RPC data over the wire |
| to this target. |
| 1: enable (default) ; 0: disable |
| |
| What: /sys/fs/lustre/osc/{connection_name}/contention_seconds |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls for how long to consider a file contended once |
| indicated as such by the server. |
| When a file is considered contended, all operations switch to |
| synchronous lockless mode to avoid cache and lock pingpong. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/cur_dirty_bytes |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Displays how many dirty bytes is presently in the cache for this |
| target. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/cur_grant_bytes |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows how many bytes we have as a "dirty cache" grant from the |
| server. Writing a value smaller than shown allows to release |
| some grant back to the server. |
| Dirty cache grant is a way Lustre ensures that cached successful |
| writes on client do not end up discarded by the server due to |
| lack of space later on. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/cur_lost_grant_bytes |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Shows how many granted bytes were released to the server due |
| to lack of write activity on this client. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/grant_shrink_interval |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of seconds with no write activity for this target |
| to start releasing dirty grant back to the server. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/destroys_in_flight |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of DESTROY RPCs currently in flight to this target. |
| |
| What: /sys/fs/lustre/osc/{connection_name}/lockless_truncate |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls whether lockless truncate RPCs are allowed to this |
| target. |
| Lockless truncate causes server to perform the locking which |
| is beneficial if the truncate is not followed by a write |
| immediately. |
| 1: enable ; 0: disable (default) |
| |
| What: /sys/fs/lustre/osc/{connection_name}/max_dirty_mb |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls how much dirty data this client can accumulate |
| for this target. This is orthogonal to dirty grant and is |
| a hard limit even if the server would allow a bigger dirty |
| cache. |
| While allowing higher dirty cache is beneficial for write |
| performance, flushing write cache takes longer and as such |
| the node might be more prone to OOMs. |
| Having this value set too low might result in not being able |
| to sent too many parallel WRITE RPCs. |
| Default: 32 |
| |
| What: /sys/fs/lustre/osc/{connection_name}/resend_count |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Controls how many times to try and resend RPCs to this target |
| that failed with "recoverable" status, such as EAGAIN, |
| ENOMEM. |
| |
| What: /sys/fs/lustre/lov/{connection_name}/numobd |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of OSC targets managed by this LOV instance. |
| |
| What: /sys/fs/lustre/lov/{connection_name}/activeobd |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of OSC targets managed by this LOV instance that are |
| actually active. |
| |
| What: /sys/fs/lustre/lmv/{connection_name}/numobd |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of MDC targets managed by this LMV instance. |
| |
| What: /sys/fs/lustre/lmv/{connection_name}/activeobd |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Number of MDC targets managed by this LMV instance that are |
| actually active. |
| |
| What: /sys/fs/lustre/lmv/{connection_name}/placement |
| Date: May 2015 |
| Contact: "Oleg Drokin" <oleg.drokin@intel.com> |
| Description: |
| Determines policy of inode placement in case of multiple |
| metadata servers: |
| CHAR - based on a hash of the file name used at creation time |
| (Default) |
| NID - based on a hash of creating client network id. |
