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https://github.com/torvalds/linux
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e0ca873916
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
99 lines
4.1 KiB
Text
99 lines
4.1 KiB
Text
POHMELFS usage information.
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Mount options.
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All but index, number of crypto threads and maximum IO size can changed via remount.
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idx=%u
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Each mountpoint is associated with a special index via this option.
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Administrator can add or remove servers from the given index, so all mounts,
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which were attached to it, are updated.
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Default it is 0.
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trans_scan_timeout=%u
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This timeout, expressed in milliseconds, specifies time to scan transaction
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trees looking for stale requests, which have to be resent, or if number of
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retries exceed specified limit, dropped with error.
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Default is 5 seconds.
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drop_scan_timeout=%u
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Internal timeout, expressed in milliseconds, which specifies how frequently
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inodes marked to be dropped are freed. It also specifies how frequently
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the system checks that servers have to be added or removed from current working set.
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Default is 1 second.
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wait_on_page_timeout=%u
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Number of milliseconds to wait for reply from remote server for data reading command.
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If this timeout is exceeded, reading returns an error.
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Default is 5 seconds.
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trans_retries=%u
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This is the number of times that a transaction will be resent to a server that did
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not answer for the last @trans_scan_timeout milliseconds.
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When the number of resends exceeds this limit, the transaction is completed with error.
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Default is 5 resends.
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crypto_thread_num=%u
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Number of crypto processing threads. Threads are used both for RX and TX traffic.
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Default is 2, or no threads if crypto operations are not supported.
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trans_max_pages=%u
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Maximum number of pages in a single transaction. This parameter also controls
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the number of pages, allocated for crypto processing (each crypto thread has
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pool of pages, the number of which is equal to 'trans_max_pages'.
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Default is 100 pages.
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crypto_fail_unsupported
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If specified, mount will fail if the server does not support requested crypto operations.
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By default mount will disable non-matching crypto operations.
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mcache_timeout=%u
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Maximum number of milliseconds to wait for the mcache objects to be processed.
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Mcache includes locks (given lock should be granted by server), attributes (they should be
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fully received in the given timeframe).
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Default is 5 seconds.
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Usage examples.
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Add server server1.net:1025 into the working set with index $idx
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with appropriate hash algorithm and key file and cipher algorithm, mode and key file:
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$cfg A add -a server1.net -p 1025 -i $idx -K $hash_key -k $cipher_key
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Mount filesystem with given index $idx to /mnt mountpoint.
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Client will connect to all servers specified in the working set via previous command:
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mount -t pohmel -o idx=$idx q /mnt
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Change permissions to read-only (-I 1 option, '-I 2' - write-only, 3 - rw):
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$cfg A modify -a server1.net -p 1025 -i $idx -I 1
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Change IO priority to 123 (node with the highest priority gets read requests).
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$cfg A modify -a server1.net -p 1025 -i $idx -P 123
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One can check currect status of all connections in the mountstats file:
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# cat /proc/$PID/mountstats
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...
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device none mounted on /mnt with fstype pohmel
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idx addr(:port) socket_type protocol active priority permissions
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0 server1.net:1026 1 6 1 250 1
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0 server2.net:1025 1 6 1 123 3
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Server installation.
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Creating a server, which listens at port 1025 and 0.0.0.0 address.
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Working root directory (note, that server chroots there, so you have to have appropriate permissions)
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is set to /mnt, server will negotiate hash/cipher with client, in case client requested it, there
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are appropriate key files.
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Number of working threads is set to 10.
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# ./fserver -a 0.0.0.0 -p 1025 -r /mnt -w 10 -K hash_key -k cipher_key
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-A 6 - listen on ipv6 address. Default: Disabled.
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-r root - path to root directory. Default: /tmp.
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-a addr - listen address. Default: 0.0.0.0.
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-p port - listen port. Default: 1025.
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-w workers - number of workers per connected client. Default: 1.
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-K file - hash key size. Default: none.
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-k file - cipher key size. Default: none.
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-h - this help.
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Number of worker threads specifies how many workers will be created for each client.
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Bulk single-client transafers usually are better handled with smaller number (like 1-3).
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