Global File System 2

Red Hat Enterprise Linux 7 Global File System 2

Red Hat Global File System 2

Steven Levine

Red Hat Enterprise Linux 7 Global File System 2

Red Hat Global File System 2

Steven Levine Red Hat Customer Content Services [email protected] Legal Notice

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Abstract This book provides information about configuring and maintaining Red Hat GFS2 (Red Hat Global File System 2) for Red Hat Enterprise Linux 7. T able of Cont ent s

Table of Contents

.C .h .a .p . t.e .r . 1. .. G. .F .S .2 . .O . v. e. r.v .i e. w...... 3...... ⁠1.1. New and Chang ed Features 4 ⁠1.2. Befo re Setting Up GFS2 4 ⁠1.3. Installing GFS2 5 ⁠1.4. Rep lacement Functio ns fo r g fs2_to o l in Red Hat Enterp rise Linux 7 6

.C .h .a .p . t.e .r . 2. .. G. .F .S .2 . .C .o .n . f.i g. u. .r a. t. i.o .n . a. n. .d . O. .p .e .r .a .t i.o . n. a. l. C. o. .n .s .i d. e. r. a. t.i o. .n .s ...... 9...... ⁠2.1. Fo rmatting Co nsid eratio ns 9 ⁠2.2. File System Frag mentatio n 11 ⁠2.3. Blo ck Allo catio n Issues 11 ⁠2.4. Cluster Co nsid eratio ns 12 ⁠2.5. Usag e Co nsid eratio ns 12 ⁠2.6 . File System Backup s 14 ⁠2.7. Hard ware Co nsid eratio ns 15 ⁠2.8 . Perfo rmance Issues: Check the Red Hat Custo mer Po rtal 15 ⁠2.9 . GFS2 No d e Lo cking 15

.C .h .a .p . t.e .r . 3. .. M. .a .n .a .g .i n. .g . G. .F .S .2 ...... 2. 1...... ⁠3.1. Making a File System 21 ⁠3.2. Mo unting a File System 24 ⁠3.3. Unmo unting a File System 27 ⁠3.4. Sp ecial Co nsid eratio ns when Mo unting GFS2 File Systems 28 ⁠3.5. GFS2 Quo ta Manag ement 28 ⁠3.6 . Gro wing a File System 33 ⁠3.7. Ad d ing Jo urnals to a File System 34 ⁠3.8 . Data Jo urnaling 36 ⁠3.9 . Co nfig uring atime Up d ates 37 ⁠3.10 . Susp end ing Activity o n a File System 38 ⁠3.11. Rep airing a File System 39

.C .h .a .p . t.e .r . 4. .. D. .i a. g. n. o. .s .i n. g. .a .n . d. .C .o . r.r e. c. t. i.n .g . .P .r o. .b .l e. m. .s . w. .i t.h . .G . F. S. 2. .F .i l.e . S. .y .s .t e. m. .s ...... 4. 2...... ⁠4.1. GFS2 File System Sho ws Slo w Perfo rmance 42 ⁠4.2. GFS2 File System Hang s and Req uires Reb o o t o f One No d e 42 ⁠4.3. GFS2 File System Hang s and Req uires Reb o o t o f All No d es 42 ⁠4