forked from vitalif/vitastor
Add a very simple tool for calculating device offsets
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9b4e5b64ae
commit
28a0f08ce7
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// Simple tool to calculate journal and metadata offsets for a single device
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// Will be replaced by smarter tools in the future
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const child_process = require('child_process');
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async function run()
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{
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const options = {
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object_size: 128*1024,
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bitmap_granularity: 4096,
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journal_size: 16*1024*1024,
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device_block_size: 4096,
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journal_offset: 0,
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device_size: 0,
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};
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for (let i = 2; i < process.argv.length; i++)
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{
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if (process.argv[i].substr(0, 2) == '--')
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{
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options[process.argv[i].substr(2)] = process.argv[i+1];
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i++;
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}
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}
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const device_size = Number(options.device_size || await system("blockdev --getsize64 "+options.device));
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if (!device_size)
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{
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process.stderr.write('Failed to get device size\n');
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process.exit(1);
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}
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options.journal_offset = Math.ceil(options.journal_offset/options.device_block_size)*options.device_block_size;
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const meta_offset = options.journal_offset + Math.ceil(options.journal_size/options.device_block_size)*options.device_block_size;
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const entries_per_block = Math.floor(options.device_block_size / (24 + options.object_size/options.bitmap_granularity/8));
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const object_count = Math.floor((device_size-meta_offset)/options.object_size);
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const meta_size = Math.ceil(object_count / entries_per_block) * options.device_block_size;
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const data_offset = meta_offset + meta_size;
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const meta_size_fmt = (meta_size > 1024*1024*1024 ? Math.round(meta_size/1024/1024/1024*100)/100+" GB"
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: Math.round(meta_size/1024/1024*100)/100+" MB");
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process.stdout.write(
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`Metadata size: ${meta_size_fmt}\n`+
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`Options for the OSD:\n`+
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` --journal_offset ${options.journal_offset}\n`+
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` --meta_offset ${meta_offset}\n`+
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` --data_offset ${data_offset}\n`+
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(options.device_size ? ` --data_size ${device_size-data_offset}\n` : '')
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);
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}
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function system(cmd)
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{
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return new Promise((ok, no) => child_process.exec(cmd, { maxBuffer: 64*1024*1024 }, (err, stdout, stderr) => (err ? no(err) : ok(stdout))));
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}
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run().catch(console.error);
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